Theorem ax11inda 2200

Description: Induction step for constructing a substitution instance of ax-11o 2141 without using ax-11o 2141. Quantification case. (When z and y are distinct, ax11inda2 2199 may be used instead to avoid the dummy variable w in the proof.) (Contributed by NM, 24-Jan-2007.) (Proof modification is discouraged.) (New usage is discouraged.)

Hypothesis

Ref	Expression
ax11inda.1	|- (-. A.x x = w -> (x = w -> (ph -> A.x(x = w -> ph))))

Assertion

Ref	Expression
ax11inda	|- (-. A.x x = y -> (x = y -> (A.zph -> A.x(x = y -> A.zph))))

Distinct variable groups:   ph,w   x,w   y,w   z,w

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

Proof of Theorem ax11inda

Step	Hyp	Ref	Expression
1		a9ev 1656	. . 3 |- E.w w = y
2		ax11inda.1	. . . . . . 7 |- (-. A.x x = w -> (x = w -> (ph -> A.x(x = w -> ph))))
3	2	ax11inda2 2199	. . . . . 6 |- (-. A.x x = w -> (x = w -> (A.zph -> A.x(x = w -> A.zph))))
4		dveeq2-o 2184	. . . . . . . . 9 |- (-. A.x x = y -> (w = y -> A.x w = y))
5	4	imp 418	. . . . . . . 8 |- ((-. A.x x = y /\ w = y) -> A.x w = y)
6		hba1-o 2149	. . . . . . . . . 10 |- (A.x w = y -> A.xA.x w = y)
7		equequ2 1686	. . . . . . . . . . 11 |- (w = y -> (x = w <-> x = y))
8	7	sps-o 2159	. . . . . . . . . 10 |- (A.x w = y -> (x = w <-> x = y))
9	6, 8	albidh 1590	. . . . . . . . 9 |- (A.x w = y -> (A.x x = w <-> A.x x = y))
10	9	notbid 285	. . . . . . . 8 |- (A.x w = y -> (-. A.x x = w <-> -. A.x x = y))
11	5, 10	syl 15	. . . . . . 7 |- ((-. A.x x = y /\ w = y) -> (-. A.x x = w <-> -. A.x x = y))
12	7	adantl 452	. . . . . . . 8 |- ((-. A.x x = y /\ w = y) -> (x = w <-> x = y))
13	8	imbi1d 308	. . . . . . . . . . 11 |- (A.x w = y -> ((x = w -> A.zph) <-> (x = y -> A.zph)))
14	6, 13	albidh 1590	. . . . . . . . . 10 |- (A.x w = y -> (A.x(x = w -> A.zph) <-> A.x(x = y -> A.zph)))
15	5, 14	syl 15	. . . . . . . . 9 |- ((-. A.x x = y /\ w = y) -> (A.x(x = w -> A.zph) <-> A.x(x = y -> A.zph)))
16	15	imbi2d 307	. . . . . . . 8 |- ((-. A.x x = y /\ w = y) -> ((A.zph -> A.x(x = w -> A.zph)) <-> (A.zph -> A.x(x = y -> A.zph))))
17	12, 16	imbi12d 311	. . . . . . 7 |- ((-. A.x x = y /\ w = y) -> ((x = w -> (A.zph -> A.x(x = w -> A.zph))) <-> (x = y -> (A.zph -> A.x(x = y -> A.zph)))))
18	11, 17	imbi12d 311	. . . . . 6 |- ((-. A.x x = y /\ w = y) -> ((-. A.x x = w -> (x = w -> (A.zph -> A.x(x = w -> A.zph)))) <-> (-. A.x x = y -> (x = y -> (A.zph -> A.x(x = y -> A.zph))))))
19	3, 18	mpbii 202	. . . . 5 |- ((-. A.x x = y /\ w = y) -> (-. A.x x = y -> (x = y -> (A.zph -> A.x(x = y -> A.zph)))))
20	19	ex 423	. . . 4 |- (-. A.x x = y -> (w = y -> (-. A.x x = y -> (x = y -> (A.zph -> A.x(x = y -> A.zph))))))
21	20	exlimdv 1636	. . 3 |- (-. A.x x = y -> (E.w w = y -> (-. A.x x = y -> (x = y -> (A.zph -> A.x(x = y -> A.zph))))))
22	1, 21	mpi 16	. 2 |- (-. A.x x = y -> (-. A.x x = y -> (x = y -> (A.zph -> A.x(x = y -> A.zph)))))
23	22	pm2.43i 43	1 |- (-. A.x x = y -> (x = y -> (A.zph -> A.x(x = y -> A.zph))))

Syntax hints:  -. wn 3   -> wi 4   <-> wb 176   /\ wa 358  A.wal 1540  E.wex 1541

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 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  ax-4 2135  ax-5o 2136  ax-6o 2137  ax-10o 2139  ax-12o 2142  ax-16 2144

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: (None)