Theorem hbeqd 2424

Description: Deduction version of bound-variable hypothesis builder hbeq 1995.

Hypotheses

Ref	Expression
hbeqd.1	|- (ph -> A.xph)
hbeqd.2	|- (ph -> (y e. A -> A.x y e. A))
hbeqd.3	|- (ph -> (y e. B -> A.x y e. B))

Assertion

Ref	Expression
hbeqd	|- (ph -> (A = B -> A.x A = B))

Distinct variable groups:   y,A   y,B   ph,y   x,y

Proof of Theorem hbeqd

Step	Hyp	Ref	Expression
1		hba1 1350	. . . . 5 |- (A.x z e. A -> A.xA.x z e. A)
2	1	hbab 1875	. . . 4 |- (y e. {z | A.x z e. A} -> A.x y e. {z | A.x z e. A})
3		hba1 1350	. . . . 5 |- (A.x z e. B -> A.xA.x z e. B)
4	3	hbab 1875	. . . 4 |- (y e. {z | A.x z e. B} -> A.x y e. {z | A.x z e. B})
5	2, 4	hbeq 1995	. . 3 |- ({z | A.x z e. A} = {z | A.x z e. B} -> A.x{z | A.x z e. A} = {z | A.x z e. B})
6	5	a1i 8	. 2 |- (ph -> ({z | A.x z e. A} = {z | A.x z e. B} -> A.x{z | A.x z e. A} = {z | A.x z e. B}))
7		hbeqd.2	. . . . 5 |- (ph -> (y e. A -> A.x y e. A))
8	7	19.21aiv 1664	. . . 4 |- (ph -> A.y(y e. A -> A.x y e. A))
9		abidhb 2423	. . . 4 |- (A.y(y e. A -> A.x y e. A) -> {z | A.x z e. A} = A)
10	8, 9	syl 12	. . 3 |- (ph -> {z | A.x z e. A} = A)
11		hbeqd.3	. . . . 5 |- (ph -> (y e. B -> A.x y e. B))
12	11	19.21aiv 1664	. . . 4 |- (ph -> A.y(y e. B -> A.x y e. B))
13		abidhb 2423	. . . 4 |- (A.y(y e. B -> A.x y e. B) -> {z | A.x z e. B} = B)
14	12, 13	syl 12	. . 3 |- (ph -> {z | A.x z e. B} = B)
15	10, 14	eqeq12d 1899	. 2 |- (ph -> ({z | A.x z e. A} = {z | A.x z e. B} <-> A = B))
16		hbeqd.1	. . 3 |- (ph -> A.xph)
17	16, 15	albid 1459	. 2 |- (ph -> (A.x{z | A.x z e. A} = {z | A.x z e. B} <-> A.x A = B))
18	6, 15, 17	3imtr3d 601	1 |- (ph -> (A = B -> A.x A = B))

Syntax hints:   -> wi 3  A.wal 1296   = wceq 1298   e. wcel 1300  {cab 1871

This theorem is referenced by:  sbcralt 2527  sbcralgf 2529  dfid3 3587

This theorem was proved from axioms:  ax-1 4  ax-2 5  ax-3 6  ax-mp 7  ax-5 1302  ax-7 1304  ax-gen 1305  ax-8 1306  ax-9 1307  ax-10 1308  ax-11 1309  ax-12 1310  ax-17 1317  ax-4 1319  ax-5o 1321  ax-6o 1324  ax-9o 1481  ax-10o 1500  ax-16 1580  ax-11o 1588  ax-ext 1865

This theorem depends on definitions:  df-bi 164  df-or 241  df-an 242  df-ex 1327  df-sb 1536  df-clab 1872  df-cleq 1877  df-clel 1880

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