Theorem or1r 105

Description: Disjunction with 1.

Assertion

Ref	Expression
or1r	(1 v a) = 1

Proof of Theorem or1r

Step	Hyp	Ref	Expression
1		ax-a2 31	. 2 (1 v a) = (a v 1)
2		or1 104	. 2 (a v 1) = 1
3	1, 2	ax-r2 36	1 (1 v a) = 1

Syntax hints:   = wb 1   v wo 6  1wt 8

This theorem is referenced by:  ud3lem1c 568  ud3lem3 576  ud5lem1 589  i1orni1 847  lem3.3.7i1e1 1059  lem3.3.7i1e2 1060  lem3.3.7i2e1 1062  lem3.3.7i2e2 1063

This theorem was proved from axioms:  ax-a2 31  ax-a4 33  ax-r1 35  ax-r2 36  ax-r5 38

This theorem depends on definitions:  df-t 41

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