Theorem a16g 1945

Description: Generalization of ax16 2045. (Contributed by NM, 25-Jul-2015.)

Assertion

Ref	Expression
a16g	|- (A.x x = y -> (ph -> A.zph))

Distinct variable group:   x,y

Allowed substitution hints:   ph(x,y,z)

Proof of Theorem a16g

Dummy variable w is distinct from all other variables.

Step	Hyp	Ref	Expression
1		a9ev 1656	. 2 |- E.w w = z
2		ax10lem5 1942	. 2 |- (A.x x = y -> A.w w = z)
3		hbn1 1730	. . . . 5 |- (-. A.w w = z -> A.w -. A.w w = z)
4		pm2.21 100	. . . . 5 |- (-. A.w w = z -> (A.w w = z -> (ph -> A.zph)))
5	3, 4	alrimih 1565	. . . 4 |- (-. A.w w = z -> A.w(A.w w = z -> (ph -> A.zph)))
6		ax-17 1616	. . . . 5 |- ((ph -> A.zph) -> A.w(ph -> A.zph))
7		ax-1 6	. . . . 5 |- ((ph -> A.zph) -> (A.w w = z -> (ph -> A.zph)))
8	6, 7	alrimih 1565	. . . 4 |- ((ph -> A.zph) -> A.w(A.w w = z -> (ph -> A.zph)))
9	5, 8	ja 153	. . 3 |- ((A.w w = z -> (ph -> A.zph)) -> A.w(A.w w = z -> (ph -> A.zph)))
10		ax10lem5 1942	. . . 4 |- (A.w w = z -> A.z z = w)
11		equcomi 1679	. . . . . . 7 |- (w = z -> z = w)
12		ax-17 1616	. . . . . . 7 |- (ph -> A.wph)
13		ax-11 1746	. . . . . . 7 |- (z = w -> (A.wph -> A.z(z = w -> ph)))
14	11, 12, 13	syl2im 34	. . . . . 6 |- (w = z -> (ph -> A.z(z = w -> ph)))
15		ax-5 1557	. . . . . 6 |- (A.z(z = w -> ph) -> (A.z z = w -> A.zph))
16	14, 15	syl6 29	. . . . 5 |- (w = z -> (ph -> (A.z z = w -> A.zph)))
17	16	com23 72	. . . 4 |- (w = z -> (A.z z = w -> (ph -> A.zph)))
18	10, 17	syl5 28	. . 3 |- (w = z -> (A.w w = z -> (ph -> A.zph)))
19	9, 18	exlimih 1804	. 2 |- (E.w w = z -> (A.w w = z -> (ph -> A.zph)))
20	1, 2, 19	mpsyl 59	1 |- (A.x x = y -> (ph -> A.zph))

Syntax hints:  -. wn 3   -> wi 4  A.wal 1540  E.wex 1541

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-6 1729  ax-7 1734  ax-11 1746  ax-12 1925

This theorem depends on definitions:  df-bi 177  df-an 360  df-tru 1319  df-ex 1542  df-nf 1545

This theorem is referenced by:  ax16  2045  a16gb  2050  a16nf  2051