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Questions of the kind "What's the name for a X that satisfies property Y?"

4 votes

Quantifying the noninvertibility of a function

$\lambda(f):=\kappa_f-1$ is called "the coefficient of coalescence of $f$" here: https://msp.org/pjm/1982/103-2/pjm-v103-n2-p03-p.pdf (note the typo on p.269, the correct definition appears on p.27 …
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