Theorem u5lemanb 601

Description: Lemma for relevance implication study.

Assertion

Ref	Expression
u5lemanb	((a ->5 b) ^ b_|_) = (a_|_ ^ b_|_)

Proof of Theorem u5lemanb

Step	Hyp	Ref	Expression
1		df-i5 47	. . 3 (a ->5 b) = (((a ^ b) v (a_|_ ^ b)) v (a_|_ ^ b_|_))
2	1	ran 71	. 2 ((a ->5 b) ^ b_|_) = ((((a ^ b) v (a_|_ ^ b)) v (a_|_ ^ b_|_)) ^ b_|_)
3		comanr2 447	. . . . . 6 b C (a ^ b)
4	3	comcom3 436	. . . . 5 b_|_ C (a ^ b)
5		comanr2 447	. . . . . 6 b C (a_|_ ^ b)
6	5	comcom3 436	. . . . 5 b_|_ C (a_|_ ^ b)
7	4, 6	com2or 465	. . . 4 b_|_ C ((a ^ b) v (a_|_ ^ b))
8		comanr2 447	. . . 4 b_|_ C (a_|_ ^ b_|_)
9	7, 8	fh1r 455	. . 3 ((((a ^ b) v (a_|_ ^ b)) v (a_|_ ^ b_|_)) ^ b_|_) = ((((a ^ b) v (a_|_ ^ b)) ^ b_|_) v ((a_|_ ^ b_|_) ^ b_|_))
10		ax-a2 30	. . . 4 ((((a ^ b) v (a_|_ ^ b)) ^ b_|_) v ((a_|_ ^ b_|_) ^ b_|_)) = (((a_|_ ^ b_|_) ^ b_|_) v (((a ^ b) v (a_|_ ^ b)) ^ b_|_))
11		anass 69	. . . . . . 7 ((a_|_ ^ b_|_) ^ b_|_) = (a_|_ ^ (b_|_ ^ b_|_))
12		anidm 103	. . . . . . . 8 (b_|_ ^ b_|_) = b_|_
13	12	lan 70	. . . . . . 7 (a_|_ ^ (b_|_ ^ b_|_)) = (a_|_ ^ b_|_)
14	11, 13	ax-r2 35	. . . . . 6 ((a_|_ ^ b_|_) ^ b_|_) = (a_|_ ^ b_|_)
15	4, 6	fh1r 455	. . . . . . 7 (((a ^ b) v (a_|_ ^ b)) ^ b_|_) = (((a ^ b) ^ b_|_) v ((a_|_ ^ b) ^ b_|_))
16		anass 69	. . . . . . . . . 10 ((a ^ b) ^ b_|_) = (a ^ (b ^ b_|_))
17		dff 93	. . . . . . . . . . . . 13 0 = (b ^ b_|_)
18	17	lan 70	. . . . . . . . . . . 12 (a ^ 0) = (a ^ (b ^ b_|_))
19	18	ax-r1 34	. . . . . . . . . . 11 (a ^ (b ^ b_|_)) = (a ^ 0)
20		an0 100	. . . . . . . . . . 11 (a ^ 0) = 0
21	19, 20	ax-r2 35	. . . . . . . . . 10 (a ^ (b ^ b_|_)) = 0
22	16, 21	ax-r2 35	. . . . . . . . 9 ((a ^ b) ^ b_|_) = 0
23		anass 69	. . . . . . . . . 10 ((a_|_ ^ b) ^ b_|_) = (a_|_ ^ (b ^ b_|_))
24	17	lan 70	. . . . . . . . . . . 12 (a_|_ ^ 0) = (a_|_ ^ (b ^ b_|_))
25	24	ax-r1 34	. . . . . . . . . . 11 (a_|_ ^ (b ^ b_|_)) = (a_|_ ^ 0)
26		an0 100	. . . . . . . . . . 11 (a_|_ ^ 0) = 0
27	25, 26	ax-r2 35	. . . . . . . . . 10 (a_|_ ^ (b ^ b_|_)) = 0
28	23, 27	ax-r2 35	. . . . . . . . 9 ((a_|_ ^ b) ^ b_|_) = 0
29	22, 28	2or 67	. . . . . . . 8 (((a ^ b) ^ b_|_) v ((a_|_ ^ b) ^ b_|_)) = (0 v 0)
30		or0 94	. . . . . . . 8 (0 v 0) = 0
31	29, 30	ax-r2 35	. . . . . . 7 (((a ^ b) ^ b_|_) v ((a_|_ ^ b) ^ b_|_)) = 0
32	15, 31	ax-r2 35	. . . . . 6 (((a ^ b) v (a_|_ ^ b)) ^ b_|_) = 0
33	14, 32	2or 67	. . . . 5 (((a_|_ ^ b_|_) ^ b_|_) v (((a ^ b) v (a_|_ ^ b)) ^ b_|_)) = ((a_|_ ^ b_|_) v 0)
34		or0 94	. . . . 5 ((a_|_ ^ b_|_) v 0) = (a_|_ ^ b_|_)
35	33, 34	ax-r2 35	. . . 4 (((a_|_ ^ b_|_) ^ b_|_) v (((a ^ b) v (a_|_ ^ b)) ^ b_|_)) = (a_|_ ^ b_|_)
36	10, 35	ax-r2 35	. . 3 ((((a ^ b) v (a_|_ ^ b)) ^ b_|_) v ((a_|_ ^ b_|_) ^ b_|_)) = (a_|_ ^ b_|_)
37	9, 36	ax-r2 35	. 2 ((((a ^ b) v (a_|_ ^ b)) v (a_|_ ^ b_|_)) ^ b_|_) = (a_|_ ^ b_|_)
38	2, 37	ax-r2 35	1 ((a ->5 b) ^ b_|_) = (a_|_ ^ b_|_)

Syntax hints:   = wb 1  _|_wn 4   v wo 6   ^ wa 7  0wf 10   ->5 wi5 17

This theorem is referenced by:  u5lemnob 656  u5lembi 707

This theorem was proved from axioms:  ax-a1 29  ax-a2 30  ax-a3 31  ax-a4 32  ax-a5 33  ax-r1 34  ax-r2 35  ax-r4 36  ax-r5 37  ax-r3 421

This theorem depends on definitions:  df-b 38  df-a 39  df-t 40  df-f 41  df-i5 47  df-le1 122  df-le2 123  df-c1 124  df-c2 125

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