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ZF (ZERMELO-FRAENKEL) SET THEORY
ZF Set Theory - add the Axiom of Union
Ordinal arithmetic
c3o
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c4o
Metamath Proof Explorer
Ascii
Structured
Syntax definition
c3o
Description:
Extend the definition of a class to include the ordinal number 3.
Ref
Expression
Assertion
c3o
class
3
o