Ideas from 'works' by Luitzen E.J. Brouwer [1930], by Theme Structure

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5. Theory of Logic / D. Assumptions for Logic / 2. Excluded Middle
For intuitionists excluded middle is an outdated historical convention
6. Mathematics / A. Nature of Mathematics / 3. Numbers / h. Reals from Cauchy
Brouwer saw reals as potential, not actual, and produced by a rule, or a choice