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Syntax Definition cptdfc 27665
Description:  PtDf is a predicate that is crucial for the definition of lines as well as proving a number of important theorems.
Ref Expression
cA  class  A
cB  class  B
Ref Expression
cptdfc  class  PtDf ( A ,  B )

See definition df-ptdf 27681 for more information.

Colors of variables: wff set class
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