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ZF (ZERMELO-FRAENKEL) SET THEORY
ZF Set Theory - add the Axiom of Union
First and second members of an ordered pair
c2nd
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df-1st
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Syntax definition
c2nd
Description:
Extend the definition of a class to include the second member an ordered pair function.
Ref
Expression
Assertion
c2nd
$${class}{2}^{nd}$$