or42 - Intuitionistic Logic Explorer

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Theorem or42 761

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 760	. 2 $\/$ $\/$ $\/$ $\/$ $\/$ $\/$
2		orcom 717	. . 3 $\/$ $\/$
3	2	orbi2i 751	. 2 $\/$ $\/$ $\/$ $\/$ $\/$ $\/$
4	1, 3	bitri 183	1 $\/$ $\/$ $\/$ $\/$ $\/$ $\/$

Colors of variables: wff set class

Syntax hints:

wb 104 $\/$ wo 697

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 698

This theorem depends on definitions: df-bi 116

This theorem is referenced by: reapcotr 8353