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## Possible Answers:
**EPI**.

**EPI**.

Last seen on: Daily Boston Globe Crossword Sunday, 17 December 2023

### Random information on the term “EPI”:

In mathematics, the epigraph or supergraph, denoted by epi f , {\displaystyle \operatorname {epi} f,} of a function f ( X ) {\displaystyle f(X)} valued in the extended real numbers, f : X → [ − ∞ , ∞ ] = R ∪ { ± ∞ } {\displaystyle f:X\to [-\infty ,\infty ]=\mathbb {R} \cup \{\pm \infty \}} , is the set 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.