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
a skibidi that dosent need other skibidis and works on thier grimace shake factory and fanum taxes any skibidis mew that gets in thier way
by sigmamewer March 21, 2024
a skibidi that dosent need any othe skibidis in thier life and works on their grimace shake factory and fanum taxes any skibidis that get in their way
by sigmamewer March 21, 2024
A skibidi that doesn't care about any other skibidis and only works on their grimace shake factory. they also fanum taxes the mews of those skbidis that do dare to get in their way.
by sigmamewer March 22, 2024
Person one : what the skibidi sigma
Person two : are you rizzing up Grimmace shake in Ohio
Person one : well first of you one two buckle my shoe three four buckle some more five six Nike kicks it’s a Gyatt
Person two : *shoots himself*
Person two : are you rizzing up Grimmace shake in Ohio
Person one : well first of you one two buckle my shoe three four buckle some more five six Nike kicks it’s a Gyatt
Person two : *shoots himself*
by Sigma Gyatt in Ohio April 27, 2024