Theorem wdf-le2 379

Description: Define 'less than or equal to' analogue for == analogue of =.

Hypothesis

Ref	Expression
wdf-le2.1	(a =<2 b) = 1

Assertion

Ref	Expression
wdf-le2	((a v b) == b) = 1

Proof of Theorem wdf-le2

Step	Hyp	Ref	Expression
1		df-le 129	. . 3 (a =<2 b) = ((a v b) == b)
2	1	ax-r1 35	. 2 ((a v b) == b) = (a =<2 b)
3		wdf-le2.1	. 2 (a =<2 b) = 1
4	2, 3	ax-r2 36	1 ((a v b) == b) = 1

Syntax hints:   = wb 1   == tb 5   v wo 6  1wt 8   =<2 wle2 10

This theorem is referenced by:  wom4 380  wdf2le2 386  wleror 393  wlecon 395  wletr 396  wbltr 397  wlebi 402

This theorem was proved from axioms:  ax-r1 35  ax-r2 36

This theorem depends on definitions:  df-le 129

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