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.
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 05, 2022
by Oliver the cool man October 02, 2023
You could possibly encounter one o these moggers at kai cenat's house. They give out maximum amounts of YouTube shorts brainrot
by Smilingreaper420 April 10, 2024
Sigma Chode: A chode that is insignificantly puny, so the possessor has no excessive need for validation.
Beta: Hey, Sigma, your Sigma Chode is showing out of your trousers.
Sigma: *Mogs showing Sigma Chode*
Beta: Damn, I didn't know you were chill like that.
Beta: *daps up Sigma Chode*
Sigma: *Mogs showing Sigma Chode*
Beta: Damn, I didn't know you were chill like that.
Beta: *daps up Sigma Chode*
by SigmaChode3D March 12, 2024
Sentence: I have a sigma chide , He has a sigma chode
Conversation
Kyle: Bro you have a sigma chode
Me: I know bro isn't it super cool!
Conversation
Kyle: Bro you have a sigma chode
Me: I know bro isn't it super cool!
by Nikc.sc June 14, 2024