1. On Practical and Theoretical Thinking and Other False Dichotomies in Mathematics Education Author Sierpinska, Anna, Hoffmann, Michael H.G., editor, Lenhard, Johannes, editor, and Seeger, Falk, editor Published 2005 Full Text View/download PDF
2. Signs as Means for Discoveries : Peirce and His Concepts of 'Diagrammatic Reasoning,' 'Theorematic Deduction,' 'Hypostatic Abstraction,' and 'Theoric Transformation' Author Hoffmann, Michael H. G., Hoffmann, Michael H.G., editor, Lenhard, Johannes, editor, and Seeger, Falk, editor Published 2005 Full Text View/download PDF