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![Cover for Gila Hanna · Explanation and Proof in Mathematics: Philosophical and Educational Perspectives (Paperback Bog) [2010 edition] (2014)](https://imusic.b-cdn.net/images/item/original/735/9781489982735.jpg?gila-hanna-2014-explanation-and-proof-in-mathematics-philosophical-and-educational-perspectives-paperback-bog&class=scaled&v=1430654804)
![Cover for Gila Hanna · Proof and Proving in Mathematics Education: The 19th ICMI Study - New ICMI Study Series (Paperback Bog) [2012 edition] (2014)](https://imusic.b-cdn.net/images/item/original/667/9789401780667.jpg?gila-hanna-2014-proof-and-proving-in-mathematics-education-the-19th-icmi-study-new-icmi-study-series-paperback-bog&class=scaled&v=1430654804)
![Cover for Gila Hanna · Explanation and Proof in Mathematics: Philosophical and Educational Perspectives (Hardcover bog) [2010 edition] (2009)](https://imusic.b-cdn.net/images/item/original/758/9781441905758.jpg?gila-hanna-2009-explanation-and-proof-in-mathematics-philosophical-and-educational-perspectives-hardcover-bog&class=scaled&v=1430654803)