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Logic, Proof and Paradoxes

This topic is about how arguments decide what must be true.

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About this topic

Logic, proof and paradoxes sit close to the foundations of mathematics: what counts as a valid argument, and what happens when intuition breaks.

Use this section to slow thinking down: make a claim, test it, search for a counterexample, then decide what has actually been proved.

Explore this through truth tables and logical connectives, direct proof, contradiction, induction and counterexamples, paradoxes involving infinity, sets and probability.

Further exploration

Look up: proof by contradiction

Explore next: Hilbert's Hotel

Try searching for: truth tables and logical implication