14 20 13217 https://repo.cei-bg.org/files/original/add7d1ecc9806ba653f3021bb520ea2e.zip 7035ee2656aad2738927d028362ca2bd Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Човекът и природата 6 клас Булвест Publisher An entity responsible for making the resource available Издателство „Булвест 2000“ Language A language of the resource Български Contributor An entity responsible for making contributions to the resource Издателство „Булвест 2000“ Материали с вградена интерактивност Дидактически материали с вгра¬дена интерактивност (например чрез HTML, SlideShow, e-learning софтуер Kitaboo, изо-бра¬жения и документи) на издателствата Анубис и Булвест 2000 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context b6chp026 Title A name given to the resource Автомобил Creator An entity primarily responsible for making the resource Издателство „Булвест 2000“ Description An account of the resource Интерактивна задача Subject The topic of the resource 6. клас Човекът и природата издателство „Булвест 2000“ Интерактивна задача 6. клас Интерактивна задача Човекът и природата https://repo.cei-bg.org/files/original/ae63fed00a8a9abe037c4bee6873f0f9.zip 1894c872b0b41194a2dd2136a7f35ed9 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Литература 6 клас Булвест Publisher An entity responsible for making the resource available Издателство „Булвест 2000“ Language A language of the resource Български Contributor An entity responsible for making contributions to the resource Издателство „Булвест 2000“ Материали с вградена интерактивност Дидактически материали с вгра¬дена интерактивност (например чрез HTML, SlideShow, e-learning софтуер Kitaboo, изо-бра¬жения и документи) на издателствата Анубис и Булвест 2000 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context b6lit185 Title A name given to the resource Автори и творби Creator An entity primarily responsible for making the resource Издателство „Булвест 2000“ Description An account of the resource Интерактивна задача Subject The topic of the resource 6. клас Литература издателство „Булвест 2000“ Интерактивна задача 6. клас Интерактивна задача Литература https://repo.cei-bg.org/files/original/d1fa54c9f565b71bffd8d220b8d7b1d9.zip 233bcab7f80145082b81a42eb2b29756 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Музика 2 клас Анубис Publisher An entity responsible for making the resource available ИК "Анубис" Language A language of the resource Български Contributor An entity responsible for making contributions to the resource ИК "Анубис" Материали с вградена интерактивност Дидактически материали с вгра¬дена интерактивност (например чрез HTML, SlideShow, e-learning софтуер Kitaboo, изо-бра¬жения и документи) на издателствата Анубис и Булвест 2000 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context a2muz115 Title A name given to the resource Авторска и народна песен Creator An entity primarily responsible for making the resource ИК „Анубис“ Description An account of the resource Интерактивна задача Subject The topic of the resource 2. клас музика ИК „Анубис“ интерактивна задача 2. клас Интерактивна задача Музика https://repo.cei-bg.org/files/original/7d9385e5655e1a8ddaa206af484d9803.zip 7adb48b6247d19fa9ae1a9627412de2e Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Технология и предприемачество 6 клас Анубис Publisher An entity responsible for making the resource available ИК "Анубис" Language A language of the resource Български Contributor An entity responsible for making contributions to the resource ИК "Анубис" Материали с вградена интерактивност Дидактически материали с вгра¬дена интерактивност (например чрез HTML, SlideShow, e-learning софтуер Kitaboo, изо-бра¬жения и документи) на издателствата Анубис и Булвест 2000 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context a6tp043 Title A name given to the resource Аграрни дейности Creator An entity primarily responsible for making the resource ИК „Анубис“ Description An account of the resource Интерактивна задача Subject The topic of the resource 6. клас технологии и предприемачество ИК „Анубис“ интерактивна задача 6. клас Интерактивна задача Технологии и предприемачество https://repo.cei-bg.org/files/original/103606b21b94ac6f36c9028a752c72f9.zip 5469704400e61f4b7a8256d88fd8147e Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Човекът и природата 5 клас Булвест Creator An entity primarily responsible for making the resource Издателство Булвест 2000 Publisher An entity responsible for making the resource available Издателство Булвест 2000 Language A language of the resource Български език Contributor An entity responsible for making contributions to the resource Издателство „Булвест 2000“ Материали с вградена интерактивност Дидактически материали с вгра¬дена интерактивност (например чрез HTML, SlideShow, e-learning софтуер Kitaboo, изо-бра¬жения и документи) на издателствата Анубис и Булвест 2000 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context 5KCP0079 Title A name given to the resource Аерозолите и климатичните промени Creator An entity primarily responsible for making the resource Издателство „Булвест 2000“ Description An account of the resource Интерактивна задача Subject The topic of the resource 5. клас Човекът и природата издателство „Булвест 2000“ интерактивна задача 5. клас Интерактивна задача Човекът и природата https://repo.cei-bg.org/files/original/c4e20efe0d2a0718a2038e064a84a68e.zip a7b9e43971f83f9b7f67c8eae66ef5c7 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Музика 2 клас Анубис Publisher An entity responsible for making the resource available ИК "Анубис" Language A language of the resource Български Contributor An entity responsible for making contributions to the resource ИК "Анубис" Материали с вградена интерактивност Дидактически материали с вгра¬дена интерактивност (например чрез HTML, SlideShow, e-learning софтуер Kitaboo, изо-бра¬жения и документи) на издателствата Анубис и Булвест 2000 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context a2muz176 Title A name given to the resource Аз композиторът Creator An entity primarily responsible for making the resource ИК „Анубис“ Description An account of the resource Интерактивна задача Subject The topic of the resource 2. клас музика ИК „Анубис“ интерактивна задача 2. клас Интерактивна задача Музика https://repo.cei-bg.org/files/original/7d63911d82dd1f7ea7ca259a566804f2.zip b50d3de8e4b2edbf976a69b799cb0837 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Музика 2 клас Анубис Publisher An entity responsible for making the resource available ИК "Анубис" Language A language of the resource Български Contributor An entity responsible for making contributions to the resource ИК "Анубис" Материали с вградена интерактивност Дидактически материали с вгра¬дена интерактивност (например чрез HTML, SlideShow, e-learning софтуер Kitaboo, изо-бра¬жения и документи) на издателствата Анубис и Булвест 2000 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context a2muz199 Title A name given to the resource Аз композиторът Creator An entity primarily responsible for making the resource ИК „Анубис“ Description An account of the resource Интерактивна задача Subject The topic of the resource 2. клас музика ИК „Анубис“ интерактивна задача 2. клас Интерактивна задача Музика https://repo.cei-bg.org/files/original/7beabf8375a62269e443328e5c588105.zip 11bf9fdb9837e36befcd85a831270037 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Литература 6 клас Булвест Publisher An entity responsible for making the resource available Издателство „Булвест 2000“ Language A language of the resource Български Contributor An entity responsible for making contributions to the resource Издателство „Булвест 2000“ Материали с вградена интерактивност Дидактически материали с вгра¬дена интерактивност (например чрез HTML, SlideShow, e-learning софтуер Kitaboo, изо-бра¬жения и документи) на издателствата Анубис и Булвест 2000 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context b6lit133 Title A name given to the resource Аз и другите информационен ресурс Creator An entity primarily responsible for making the resource Издателство „Булвест 2000“ Description An account of the resource Интерактивна задача Subject The topic of the resource 6. клас Литература издателство „Булвест 2000“ Интерактивна задача 6. клас Интерактивна задача Литература https://repo.cei-bg.org/files/original/1ddb758bba523f41271b983ef36aa445.zip 2247ae60763fa6ce91c00485e6891311 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Околен свят 2 клас Булвест Publisher An entity responsible for making the resource available издателство „Булвест 2000“ Language A language of the resource Български Contributor An entity responsible for making contributions to the resource Издателство „Булвест 2000“ Материали с вградена интерактивност Дидактически материали с вгра¬дена интерактивност (например чрез HTML, SlideShow, e-learning софтуер Kitaboo, изо-бра¬жения и документи) на издателствата Анубис и Булвест 2000 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context b2oks010 Title A name given to the resource Аз и моите съученици Creator An entity primarily responsible for making the resource Издателство „Булвест 2000“ Description An account of the resource Интерактивна задача Subject The topic of the resource 2. клас Околен свят издателство „Булвест 2000“ Интерактивна задача 2. клас Интерактивна задача Околен Свят https://repo.cei-bg.org/files/original/1b8dd51e6a5218d990652ba84ff3da10.zip f8eaff6a562d5f937705821eb34e9736 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Околен свят 2 клас Анубис Анубис Publisher An entity responsible for making the resource available ИК "Анубис" Language A language of the resource Български Contributor An entity responsible for making contributions to the resource ИК "Анубис" Материали с вградена интерактивност Дидактически материали с вгра¬дена интерактивност (например чрез HTML, SlideShow, e-learning софтуер Kitaboo, изо-бра¬жения и документи) на издателствата Анубис и Булвест 2000 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context a2oks018 Title A name given to the resource Аз пътувам Creator An entity primarily responsible for making the resource ИК „Анубис“ Description An account of the resource Интерактивна задача Subject The topic of the resource 2. клас околен свят ИК „Анубис“ интерактивна задача 2. клас Интерактивна задача Околен Свят https://repo.cei-bg.org/files/original/3e9334edb2d17db5ea6acf7fa82c3254.mp4 f3171e707f65820dd4616b3475c5e84c Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Читанка Борисова 1 клас Булвест Publisher An entity responsible for making the resource available издателство „Булвест 2000“ Language A language of the resource Български Creator An entity primarily responsible for making the resource Борисова Contributor An entity responsible for making contributions to the resource Издателство „Булвест 2000“ Видео ресурси Видео ресурси на издателствата Анубис и Булвест 2000 Materials http://192.168.1.166/uploads/Bulvest2000/1st_grade/chitanka_Borisova/video/1chit-s8-1.mp4 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context 1KCHITB0068 Title A name given to the resource Аз съм българче – прочит Creator An entity primarily responsible for making the resource Издателство „Булвест 2000“ Description An account of the resource Видео ресурс Subject The topic of the resource 1. клас Читанка издателство „Булвест 2000“ Видео ресурс 1. клас видео ресурс Читанка https://repo.cei-bg.org/files/original/b350c9d0fb2e7bf896cc837d484203c5.zip dcc0aedd48ad62f34cbc1faf13553243 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Читанка 1 клас Анубис Publisher An entity responsible for making the resource available ИК "Анубис" Language A language of the resource Български Contributor An entity responsible for making contributions to the resource ИК "Анубис" Материали с вградена интерактивност Дидактически материали с вгра¬дена интерактивност (например чрез HTML, SlideShow, e-learning софтуер Kitaboo, изо-бра¬жения и документи) на издателствата Анубис и Булвест 2000 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context a1chit007 Title A name given to the resource Аз съм българче (Иван Вазов) Creator An entity primarily responsible for making the resource ИК „Анубис“ Description An account of the resource Аудио Subject The topic of the resource 1. клас читанка ИК „Анубис“ 1. клас Аудио ресурс Иван Вазов Читанка https://repo.cei-bg.org/files/original/06cfe9978b003c2a07f02568f517a1a3.mp4 8d5becc90006ebb373333119c23da02b Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Читанка Герджикова 1 клас Булвест Publisher An entity responsible for making the resource available издателство „Булвест 2000“ Language A language of the resource Български Creator An entity primarily responsible for making the resource Герджикова Contributor An entity responsible for making contributions to the resource Издателство „Булвест 2000“ Видео ресурси Видео ресурси на издателствата Анубис и Булвест 2000 Materials http://192.168.1.166/uploads/Bulvest2000/1st_grade/chitanka_Gerdjikova/video/1chit-s8-1.mp4 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context 1KCHITG0091 Title A name given to the resource Аз съм българче- прочит Creator An entity primarily responsible for making the resource Издателство „Булвест 2000“ Description An account of the resource Видео ресурс Subject The topic of the resource 1. клас Читанка издателство „Булвест 2000“ Видео ресурс 1. клас видео ресурс Читанка https://repo.cei-bg.org/files/original/dcb12517ac8244f79d687aa54f64959c.zip 9a3e274e5d41cd07f21c8b366a4237dd Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Читанка 1 клас Анубис Publisher An entity responsible for making the resource available ИК "Анубис" Language A language of the resource Български Contributor An entity responsible for making contributions to the resource ИК "Анубис" Материали с вградена интерактивност Дидактически материали с вгра¬дена интерактивност (например чрез HTML, SlideShow, e-learning софтуер Kitaboo, изо-бра¬жения и документи) на издателствата Анубис и Булвест 2000 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context a1chit047 Title A name given to the resource Аз съм българче: Въведи верния отговор в празното поле. Creator An entity primarily responsible for making the resource ИК „Анубис“ Description An account of the resource Учебна задача Subject The topic of the resource 1. клас читанка ИК „Анубис“ 1. клас Гумичко учебна задача Читанка https://repo.cei-bg.org/files/original/ea165a8e5e791b54b33e25b059109365.mp3 fbf5da75ba7b3462566c8f3c687617cc Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Музика 6 клас Анубис Publisher An entity responsible for making the resource available ИК "Анубис" Language A language of the resource Български Contributor An entity responsible for making contributions to the resource ИК "Анубис" Аудио ресурси Аудио ресурси на издателствата Анубис и Булвест 2000 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context a6muz044 Title A name given to the resource Аз съм тук Инезилъя – М. Глинка А.С. Пушкин Creator An entity primarily responsible for making the resource ИК „Анубис“ Description An account of the resource Аудио Subject The topic of the resource 6. клас музика ИК „Анубис“ аудио 6. клас аудио Музика https://repo.cei-bg.org/files/original/9aebc6a7eac0af70765b332f9c1484ae.zip 025ced10cd59ac13b47b923546181905 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Български език 2 клас Булвест Publisher An entity responsible for making the resource available Издателство „Булвест 2000“ Language A language of the resource Български Contributor An entity responsible for making contributions to the resource Издателство „Булвест 2000“ Материали с вградена интерактивност Дидактически материали с вгра¬дена интерактивност (например чрез HTML, SlideShow, e-learning софтуер Kitaboo, изо-бра¬жения и документи) на издателствата Анубис и Булвест 2000 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context b2beB172 Title A name given to the resource Азбука Creator An entity primarily responsible for making the resource Издателство „Булвест 2000“ Description An account of the resource Интерактивна задача Subject The topic of the resource 2. клас Български език Борисова издателство „Булвест 2000“ Интерактивна задача 2. клас Борисова Български език Борисова Интерактивна задача https://repo.cei-bg.org/files/original/cbceb3cd4f80f09d0cec701067ca1e41.zip 0478ec35a4cf2f32d64e5603dd764a46 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Буквар 1 клас Анубис Publisher An entity responsible for making the resource available ИК "Анубис" Language A language of the resource Български Contributor An entity responsible for making contributions to the resource ИК "Анубис" Материали с вградена интерактивност Дидактически материали с вгра¬дена интерактивност (например чрез HTML, SlideShow, e-learning софтуер Kitaboo, изо-бра¬жения и документи) на издателствата Анубис и Булвест 2000 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context a1buk010 Title A name given to the resource Азбука Creator An entity primarily responsible for making the resource ИК „Анубис“ Description An account of the resource Интерактивна задача Subject The topic of the resource 1. клас буквар ИК „Анубис“ интерактивна задача 1. клас буквар Интерактивна задача https://repo.cei-bg.org/files/original/1cf9a119ff3d28ac0366be210a729f8b.zip 02f4e75dd7874c08d8bd9754bfdc3c0c Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Буквар 1 клас Анубис Publisher An entity responsible for making the resource available ИК "Анубис" Language A language of the resource Български Contributor An entity responsible for making contributions to the resource ИК "Анубис" Материали с вградена интерактивност Дидактически материали с вгра¬дена интерактивност (например чрез HTML, SlideShow, e-learning софтуер Kitaboo, изо-бра¬жения и документи) на издателствата Анубис и Булвест 2000 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context a1buk261 Title A name given to the resource Азбука Creator An entity primarily responsible for making the resource ИК „Анубис“ Description An account of the resource Интерактивна задача Subject The topic of the resource 1. клас буквар ИК „Анубис“ интерактивна задача 1. клас буквар Интерактивна задача https://repo.cei-bg.org/files/original/80aefe42a7a8637950dd20cfa73b84c7.zip f5ac5b92a00316f2635fba332e35766d Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Български език Герджикова 1 клас Булвест Creator An entity primarily responsible for making the resource Герджикова Publisher An entity responsible for making the resource available издателство „Булвест 2000“ Language A language of the resource Български Contributor An entity responsible for making contributions to the resource Издателство „Булвест 2000“ Материали с вградена интерактивност Дидактически материали с вгра¬дена интерактивност (например чрез HTML, SlideShow, e-learning софтуер Kitaboo, изо-бра¬жения и документи) на издателствата Анубис и Булвест 2000 Materials http://192.168.1.166/uploads/Bulvest2000/1st_grade/bulgarski_ezik_gerdjikova/interactive/B1b89-2.zip Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context 1KBEG0243 Title A name given to the resource Азбука – гатанка Creator An entity primarily responsible for making the resource Издателство „Булвест 2000“ Description An account of the resource Интерактивна задача Subject The topic of the resource 1. клас Български език издателство „Булвест 2000“ Интерактивна задача 1. клас Български език Интерактивна задача https://repo.cei-bg.org/files/original/ca3644fe8a702b6fa1f0089b83a722c8.zip 996545724bd3d1e84d5fbfc22202f4e8 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Български език 2 клас Анубис Publisher An entity responsible for making the resource available ИК "Анубис" Language A language of the resource Български Contributor An entity responsible for making contributions to the resource ИК "Анубис" Материали с вградена интерактивност Дидактически материали с вгра¬дена интерактивност (например чрез HTML, SlideShow, e-learning софтуер Kitaboo, изо-бра¬жения и документи) на издателствата Анубис и Булвест 2000 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Identifier An unambiguous reference to the resource within a given context a2be126 Title A name given to the resource Азбучен ред Creator An entity primarily responsible for making the resource ИК „Анубис“ Description An account of the resource Интерактивна задача Subject The topic of the resource 2. клас български език ИК „Анубис“ интерактивна задача 2. клас Български език Интерактивна задача