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Wouldn’t a lot already be in leans mathlib?
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A published formalization is code. I would not think humans have any edge when it comes to citing previously published results.
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> I am sure a lot of this development was formalising the prerequisites

How can you be so sure its not result of inefficiency?

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Oh, I am quite sure there are inefficiencies! Just that they are not entirely inefficiencies.

I have used Fable for formalisation and it will, unless I catch it, reprove results it previously had proven, inline, in other results.

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