Errata chapters 6–10 plus tactics index #16
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This is one option (which you've taken for most of the book, presumably to avoid the whole noncomputable thing). Alternatively, this could be a place to insert a footnote about the noncomputability of division (and many other functions) over reals. If you want to open the can of worms and mention the noncomputability, these were a few useful links I found that discuss it: https://leanprover.github.io/logic_and_proof/the_real_numbers.html https://www.ma.imperial.ac.uk/~buzzard/xena/formalising-mathematics-2022/Part_A/section02reals/reals.html https://leanprover-community.github.io/archive/stream/113489-new-members/topic/function.20definition.20noncomputable.html
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