Math Foundations/A/3

21. Euclid's Books VI--XIII
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22. Difficulties with Euclid
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23. The basic framework for geometry (I)
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24. The basic framework for geometry (II)
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25. The basic framework for geometry (III)
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26. The basic framework for geometry (IV)
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27. Trigonometry with rational number
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28. What exactly is a circle?
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29. Parametrizing circle
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30. What exactly is a vector?
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Continued in Math Foundations/A/4