intermediate step between direct action and mental concepts: Fermat point holistic approach: theorem and reason/proof: binomial theorem easily remembered: geometric mean dynamic concepts: perpendicular bisectors, Euclid - Arnheim understanding variables and functions: dynagraph, parabola heuristic problem solving: minimal triangle
intermediate step between direct action and mental concepts: Fermat point
holistic approach: theorem and reason/proof: binomial theorem
easily remembered: geometric mean
dynamic concepts: perpendicular bisectors, Euclid - Arnheim
understanding variables and functions: dynagraph, parabola
heuristic problem solving: minimal triangle
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