notnotrALT - Mathbox for Alan Sare

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Theorem notnotrALT 38735

Description: Converse of double negation. Alternate proof of notnotr 125. This proof is notnotrALTVD 39151 automatically translated and minimized. (Contributed by Alan Sare, 21-Apr-2013.) (Proof modification is discouraged.) (New usage is discouraged.)

**Assertion**
Ref	Expression
notnotrALT

**Proof of Theorem notnotrALT**
Step	Hyp	Ref	Expression
1		id 22	. 2
2		pm2.21 120	. 2
3	1, 2	mt4d 152	1

Colors of variables: wff setvar class

Syntax hints:

wn 3

wi 4

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8

This theorem is referenced by: (None)

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