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Published at 477 × 263 in How can we tell that 2≠1?

Implication elimination ($\Rightarrow$E): if $P\Rightarrow Q$ and $P$, then $Q$.

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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