Theorem ud1lem0a 255

Description: Introduce ->1 to the left.

Hypothesis

Ref	Expression
ud1lem0a.1	a = b

Assertion

Ref	Expression
ud1lem0a	(c ->1 a) = (c ->1 b)

Proof of Theorem ud1lem0a

Step	Hyp	Ref	Expression
1		ud1lem0a.1	. . . 4 a = b
2	1	lan 77	. . 3 (c ^ a) = (c ^ b)
3	2	lor 70	. 2 (c' v (c ^ a)) = (c' v (c ^ b))
4		df-i1 44	. 2 (c ->1 a) = (c' v (c ^ a))
5		df-i1 44	. 2 (c ->1 b) = (c' v (c ^ b))
6	3, 4, 5	3tr1 63	1 (c ->1 a) = (c ->1 b)

Syntax hints:   = wb 1  'wn 4   v wo 6   ^ wa 7   ->1 wi1 12

This theorem is referenced by:  ud1lem0ab 257  wql1 293  nom42 327  ud1 595  u3lem13b 790  2oai1u 822  1oaiii 823  oa3to4lem1 945  oa3to4lem2 946  oa4to6lem1 960  oa4to6lem2 961  oa4to6lem3 962

This theorem was proved from axioms:  ax-a2 31  ax-r1 35  ax-r2 36  ax-r4 37  ax-r5 38

This theorem depends on definitions:  df-a 40  df-i1 44

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