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Merge pull request #38 from mdempsky/parity-subtract

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Add missing "O - O = E" abstraction case
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Adam Chlipala 2020-03-17 11:24:57 -04:00 committed by GitHub
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frap_book.tex
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@ -1984,6 +1984,7 @@ As an example, consider this formalization of even-odd analysis, whose proof of
\O \; \hat{+} \; \O &=& \E \\
\_ \; \hat{+} \; \_ &=& \top \\
\E \; \hat{-} \; \E &=& \E \\
\O \; \hat{-} \; \O &=& \E \\
\_ \; \hat{-} \; \_ &=& \top \\
\E \; \hat{\times} \; \_ &=& \E \\
\_ \; \hat{\times} \; \E &=& \E \\