vault backup: 2026-03-09 17:46:37
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@@ -18,7 +18,6 @@ For any $x in X$ the output $f(x)$ is an element of $Y$.
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### Injectivity
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A function is _injective_ if every element in $y in f(x)$ has _at most_ one matching $x in X$.
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- $forall y in Y,exists excl x in X : f(x) = y$
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### Surjectivity
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A function is _surjective_ if every element $y in Y$ has _at minimum_ one matching $x in X$
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- $forall y in Y, exists x in X : f(x) = y$
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