гънка Добро чувство депозит anna sfard on the dual nature of mathematical conceptions отмъквам страх пълен
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steps towards a structural conception of the notion of variable
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PDF) On the dual nature of mathematical conceptions: Reflections on processes and objects as different sides of the same coin
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Process or object? Ways of solving mathematical problems using CAS
steps towards a structural conception of the notion of variable
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On the Dual Nature of Mathematical Conceptions: Reflections on Processes and Objects as Different Sides of the Same Coin
STEPS TOWARDS A STRUCTURAL CONCEPTION OF THE NOTION OF VARIABLE