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![Cover for Michael H G Hoffmann · Activity and Sign: Grounding Mathematics Education (Paperback Book) [Softcover reprint of hardcover 1st ed. 2005 edition] (2010)](https://imusic.b-cdn.net/images/item/original/117/9781441937117.jpg?michael-h-g-hoffmann-2010-activity-and-sign-grounding-mathematics-education-paperback-book&class=scaled&v=1550999381)
![Cover for Michael H G Hoffmann · Activity and Sign: Grounding Mathematics Education (Hardcover Book) [2005 edition] (2005)](https://imusic.b-cdn.net/images/item/original/699/9780387242699.jpg?michael-h-g-hoffmann-2005-activity-and-sign-grounding-mathematics-education-hardcover-book&class=scaled&v=1550999381)