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Syntax Definition cptdfc 38664
Description: PtDf is a predicate that is crucial for the definition of lines as well as proving a number of important theorems.
Hypotheses
Ref Expression
cA class A
cB class B
Assertion
Ref Expression
cptdfc class PtDf ( A , B )
See definition df-ptdf 38680 for more information.
Colors of variables: wff setvar class
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