Start for center or Pen

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Possible Answers:

EPI.

Last seen on: Premier Sunday – King Feature Syndicate Crossword – Jul 18 2021

Random information on the term “EPI”:

In mathematics, the epigraph or supergraph of a function f : X → [ − , ∞ ] {\displaystyle f:X\to [-\infty ,\infty ]} valued in the extended real numbers [ − , ∞ ] = R ∪ { ± } {\displaystyle [-\infty ,\infty ]=\mathbb {R} \cup \{\pm \infty \}} is the set, denoted by epi ⁡ f , {\displaystyle \operatorname {epi} f,} of all points in the Cartesian product X × R {\displaystyle X\times \mathbb {R} } lying on or above its graph. The strict epigraph epi S ⁡ f {\displaystyle \operatorname {epi} _{S}f} is the set of points in X × R {\displaystyle X\times \mathbb {R} } lying strictly above its graph.

EPI on Wikipedia