or42 - Intuitionistic Logic Explorer

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Theorem or42 772

Description: Rearrangement of 4 disjuncts. (Contributed by NM, 10-Jan-2005.)

**Assertion**
Ref	Expression
or42	$\/$ $\/$ $\/$ $\/$ $\/$ $\/$

**Proof of Theorem or42**
Step	Hyp	Ref	Expression
1		or4 771	. 2 $\/$ $\/$ $\/$ $\/$ $\/$ $\/$
2		orcom 728	. . 3 $\/$ $\/$
3	2	orbi2i 762	. 2 $\/$ $\/$ $\/$ $\/$ $\/$ $\/$
4	1, 3	bitri 184	1 $\/$ $\/$ $\/$ $\/$ $\/$ $\/$

Colors of variables: wff set class

Syntax hints:

wb 105 $\/$ wo 708

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 709

This theorem depends on definitions: df-bi 117

This theorem is referenced by: reapcotr 8545