DSLsofMath
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Explain "equality up to"
https://github.com/DSLsofMath/DSLsofMath/blob/959df2f7a7539951707fb31b5076d07862485757/L/01/E1.lhs#L145
equalityUpTo f x y = (f x) == (f y)
Typical example: equality up to (mod n) means equality modulo n