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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.

by sigma_algebra_grindset June 5, 2022


Sigma McLigma

A based Ohio skibiti toilet Sigma McLigma

X: I hate gay people y: what a absolute Sigma McLigma

by Oliver the cool man October 2, 2023


Mario sigma dumpy

A sigma mario taking a fartainius dump or a normal dump.
And by dump i mean taking a shit.

Marcus: Look its mario taking a Mario sigma dumpy

by the one and only youghurt male May 21, 2024


fanta puebes sigma

a ginger who has ginger puebes and is a sigma. there is only one of these per 40,000 people and they are all overweight and ugly. despite being a sigma they lie about having sexual intercourse with women in return for validation from male friends

" the fat fanta puebes sigma entered. i hate him he totally mogs me " - harry
" nah he cant even have sex with patricia, he lied about it. he won't mog you " - jeremy

by brawlik_god_CJPP June 28, 2024


Sigma stripe

The blue stripe found on hundred dollar bills made 2013 and after. A term created by brother p.o.w. of the alpha alpha rho chapter.

Money with the sigma stripe, my momma pray I'm loving right.

by Jadeveon Titus Ciroq October 12, 2017


Sigma at sir will

Sigma is in 9th grade and is the biggest Sigma in Georgia, art, and science. Sigma dogma ligma jigma

Have you heard of the Sigma at sir will baby gronk rizzler? They call him izz-haa-k

by Peace202101 May 7, 2024


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

by dapula_burger August 15, 2023