dissym1 - Mathbox for Anthony Hart

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Theorem dissym1 32420

Description: A symmetry with $\/$ .

See negsym1 32416 for more information. (Contributed by Anthony Hart, 4-Sep-2011.)

**Assertion**
Ref	Expression
dissym1	$\/$ $\/$ $\/$

**Proof of Theorem dissym1**
Step	Hyp	Ref	Expression
1		orc 400	. 2 $\/$
2		falim 1498	. . 3
3	2	orim2i 540	. 2 $\/$ $\/$
4	1, 3	jaoi 394	1 $\/$ $\/$ $\/$

Colors of variables: wff setvar class

Syntax hints:

wi 4 $\/$ wo 383

wfal 1488

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

This theorem depends on definitions: df-bi 197 df-or 385 df-tru 1486 df-fal 1489

This theorem is referenced by: (None)