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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.
a person who's still not over their X, mentioning them any chance they get in the disguise of an equation, often displaying obsessive, stalking behaviors.
Teacher: ''Find X''
Jane: ''you're being creepy again, maybe X left for a reason''
Teacher: ''Solve Y''
Jane: ''I don't know Y X left!!!''
Teacher: ''Answer the question. NOW.''
Jane: ''I can't believe it! You're such an algebra! Stop asking me and let's have a normal conversation for once!''
The fact that most agree one is better that the other.
Dude, algebra is so much better than geometry. Which is better, algebra vs geometry?
The most beautiful breed of woman. Usually between the 22-40 years old
Girl #1: Hey, have you see the Female Algebra Teacher?
Girl #2: Yeah, she's so hot
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A racial slur referring to those who reside in the Far East aka the Oriental People.
"Yo Soome, speak English you f*cking algebra ape!"
Math that you do not understand
except if you went to Harvard
"1+1=3"
"Dude. How do you know Algebra?"
a legal mental torture method used in schools worldwide.
synonym: mind fuck
Algebra in a nutshell
math teacher during online class: Solve for x and the answer, *shows small whiteboard with 4357894x*2398239x=???* on the webcam
students: bro teacher just mindfucked us