Database
ZF (ZERMELO-FRAENKEL) SET THEORY
ZF Set Theory - add the Axiom of Union
First and second members of an ordered pair
c2nd
Next ⟩
df-1st
Metamath Proof Explorer
Ascii
Unicode
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