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'Truth (frags)', 'Wiener Logik' and 'Introduction to Mathematical Logic'
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6. Mathematics / B. Foundations for Mathematics / 3. Axioms for Geometry
17762
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In non-Euclidean geometry, all Euclidean theorems are valid that avoid the fifth postulate [Walicki]
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6. Mathematics / B. Foundations for Mathematics / 4. Axioms for Number / f. Mathematical induction
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Inductive proof depends on the choice of the ordering [Walicki]
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