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ZF (ZERMELO-FRAENKEL) SET THEORY
ZF Set Theory - add the Axiom of Union
Ordinal arithmetic
c1o
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c2o
Metamath Proof Explorer
Unicode
Structured
Syntax definition
c1o
Description:
Extend the definition of a class to include the ordinal number 1.
Ref
Expression
Assertion
c1o
class 1o