Relations and functions
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5 Terms
1
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If R is a relation on some set A
then R is a relation from A to A.
2
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If R is a relation
then R-1 denotes the inverse relation of R.
3
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S ○ R
the composition of relations S and R. (We may write S ○ R or R; S.
4
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f: A →B
“f is a function from set A to set B”.
5
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[x]
the equivalence class of x with regard to some previously specified equivalence
relation.This class contains all elements that are related to x.
Note 
Flashcards (20)