Greek letter between rho and tau

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SIGMA.

Last seen on: LA Times Crossword, Tue, Jan 10, 2023

Random information on the term “SIGMA”:

In mathematics, a positive (or signed) measure μ defined on a σ-algebra Σ of subsets of a set X is called a finite measure if μ(X) is a finite real number (rather than ∞), and a set A in Σ is of finite measure if μ(A) < ∞. The measure μ is called σ-finite if X is a countable union of measurable sets with finite measure. A set in a measure space is said to have σ-finite measure if it is a countable union of measurable sets with finite measure. A measure being σ-finite is a weaker condition than being finite, i.e. all finite measures are σ-finite but there are (many) σ-finite measures that are not finite.

A different but related notion that should not be confused with σ-finiteness is s-finiteness.

Let ( X , A ) {\displaystyle (X,{\mathcal {A}})} be a measurable space and μ {\displaystyle \mu } a measure on it.

SIGMA on Wikipedia