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Suggestion: add definitional floating point equality #22

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alercah opened this issue Jun 7, 2023 · 0 comments
Open

Suggestion: add definitional floating point equality #22

alercah opened this issue Jun 7, 2023 · 0 comments

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@alercah
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alercah commented Jun 7, 2023

Both Agda and Idris had unsoundness caused by using IEEE floating point equality as definitional equality, whereby 0.0 == -0.0 despite the two values being different and behaving differently. In particular, 1 / 0.0 = infinity while 1 / -0.0 = -infinity, breaking function congruence.

See idris-lang/Idris-dev#2609 idris-lang/Idris2#601, agda/agda#2169
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