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Syntax Definition ctp 3655
Description: Extend class notation to include unordered triplet.
Hypotheses
Ref Expression
cA  class  A
cB  class  B
cC  class  C
Assertion
Ref Expression
ctp  class  { A ,  B ,  C }

See definition df-pr 3660 for more information.

Colors of variables: wff set class
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