sigma algebra 

A sigma algebra (or σ-algebra) is to set algebras what sigma males are to males. The Borel hierarchy (the analog of the male hierarchy) is not a σ-algebra at any countable rank; instead the σ-algebra has the largest possible rank -- ω_1, the least uncountable ordinal (under suitable conditions e.g. the Polish space is uncountable. This is known as the non-collapse of the Borel hierarchy).

A σ-algebra is closed under countable union, countable intersection, and relative complement. This means σ-algebras arise naturally in the study of measure theory, where the measurable sets form a σ-algebra.

The algebra of Lebesgue-measurable subsets of R (i.e. the sets of real numbers with a well-defined "length", which is possibly infinity) form a sigma algebra.

sigma algebra by sigma_algebra_grindset June 5, 2022

sigma-algebro 

Sigma-algebro or σ-algebro is a bro who studies probability and measure theory, as σ-algebra is one of the first things they learn in the field.

Case 1
Bro A: Josh is pulling all the girls, no wonder because he's smart and handsome and works as a quant
Bro B: Yeah Josh is a σ-algebro

Case 2
Sam had nightmares about σ-algebra during his PhD, and dropped out of school, he's failed to be a sigma-algebro

sigma-algebro by dapula_burger August 14, 2023