3orel3 - Mathbox for Scott Fenton

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Theorem 3orel3 31593

Description: Partial elimination of a triple disjunction by denial of a disjunct. (Contributed by Scott Fenton, 26-Mar-2011.)

**Assertion**
Ref	Expression
3orel3	$\/$ $\/$ $\/$

**Proof of Theorem 3orel3**
Step	Hyp	Ref	Expression
1		df-3or 1038	. 2 $\/$ $\/$ $\/$ $\/$
2		orel2 398	. 2 $\/$ $\/$ $\/$
3	1, 2	syl5bi 232	1 $\/$ $\/$ $\/$

Colors of variables: wff setvar class

Syntax hints:

wn 3

wi 4 $\/$ wo 383 $\/$ w3o 1036

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-3or 1038

This theorem is referenced by: 3orel13 31598 nolesgn2o 31824