con0 - Metamath Proof Explorer

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Syntax Definition con0 5723

Description: Extend the definition of a class to include the class of all ordinal numbers. (The 0 in the name prevents creating a file called con.html, which causes problems in Windows.)

**Assertion**
Ref	Expression
con0

See definition df-on 5727 for more information.

Colors of variables: wff setvar class

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