frege42 - Mathbox for Richard Penner

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Theorem frege42 38140

Description: Not not id 22. Proposition 42 of [Frege1879] p. 47. (Contributed by RP, 24-Dec-2019.) (Proof modification is discouraged.)

**Assertion**
Ref	Expression
frege42

**Proof of Theorem frege42**
Step	Hyp	Ref	Expression
1		frege27 38105	. 2
2		ax-frege41 38139	. 2
3	1, 2	ax-mp 5	1

Colors of variables: wff setvar class

Syntax hints:

wn 3

wi 4

This theorem was proved from axioms: ax-mp 5 ax-frege1 38084 ax-frege8 38103 ax-frege41 38139

This theorem is referenced by: frege43 38141