## Productive thinking |

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### Contents

INTRODUCTION | 1 |

Chapter One THE AREA OF THE PARALLELOGRAM | 13 |

An easier way out? The role of past experience | 58 |

Copyright | |

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actual and-sum angles answer arbitrary asked associationism attitude axioms basic behavior blind blocks chemical elements child clear concrete connections critical region deal developed direction drill Einstein envisaged equal essential example factors figure formula function Galileo Gauss gestalt gestalt psychology gestalt theory give grasped happens inner relation involved issue learned look matter Max Wertheimer Maxwell equations meaning movement multiplication needed operations p-relation pairs parallelogram piecemeal possible problem procedure productive proof psychology pupil question reactions reader realize reasonable rectangle regard result role seems senseless sensible side simply situation solid angle solution solve sometimes square steps structural features structural requirements structure-blind syllogisms symmetry task teacher teaching theoretical theory theory of relativity things thinking thought processes tion traditional logic triangle tural understanding vectors velocity of light vertical Wertheimer whole whole-qualities