Theorem i3aa 521

Description: Add antecedent. (Contributed by NM, 7-Nov-1997.)

Hypothesis

Ref	Expression
i3aa.1	a = 1

Assertion

Ref	Expression
i3aa	(b →3 a) = 1

Proof of Theorem i3aa

Step	Hyp	Ref	Expression
1		i31 520	. 2 (b →3 1) = 1
2		i3aa.1	. . . 4 a = 1
3	2	li3 252	. . 3 (b →3 a) = (b →3 1)
4	3	bi1 118	. 2 ((b →3 a) ≡ (b →3 1)) = 1
5	1, 4	wwbmpr 206	1 (b →3 a) = 1

Syntax hints:   = wb 1  1wt 8   →₃ wi3 14

This theorem was proved from axioms:  ax-a1 30  ax-a2 31  ax-a3 32  ax-a4 33  ax-a5 34  ax-r1 35  ax-r2 36  ax-r4 37  ax-r5 38

This theorem depends on definitions:  df-b 39  df-a 40  df-t 41  df-f 42  df-i3 46  df-le1 130  df-le2 131

This theorem is referenced by: (None)