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Published at 472 × 451 in How can we tell that 2≠1?

Implication introduction ($\Rightarrow$I): if from $P$ we can prove $Q$, then $P\Rightarrow Q$.

David teaches and researches maths at King’s College London, with a focus on geometry. In his spare time he likes to make music and read poetry.
davidsheard.co.uk/    All articles by David

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