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![Cover for Ernst Von Glasersfeld · Radical Constructivism in Mathematics Education - Mathematics Education Library (Hardcover Book) [1991 edition] (1991)](https://imusic.b-cdn.net/images/item/original/574/9780792312574.jpg?ernst-von-glasersfeld-1991-radical-constructivism-in-mathematics-education-mathematics-education-library-hardcover-book&class=scaled&v=1487945301)