Theorem fvopabnf 4751

Description: The value of a function given by an ordered-pair class abstraction is the empty set when the class it would otherwise map to is a proper class. This version of fvopabn 4749 uses bound-variable hypotheses instead of distinct variable conditions.

Hypotheses

Ref	Expression
fvopabgf.1	|- (z e. A -> A.x z e. A)
fvopabgf.2	|- (z e. C -> A.x z e. C)
fvopabgf.3	|- (x = A -> B = C)

Assertion

Ref	Expression
fvopabnf	|- (-. C e. _V -> ({<.x, y>. | y = B}` A) = (/))

Distinct variable groups:   z,A   y,B   z,C   x,y   x,z

Proof of Theorem fvopabnf

Step	Hyp	Ref	Expression
1		fvopabgf.1	. . . 4 |- (z e. A -> A.x z e. A)
2		fvopabgf.2	. . . 4 |- (z e. C -> A.x z e. C)
3		fvopabgf.3	. . . 4 |- (x = A -> B = C)
4	1, 2, 3	csbhypf 2572	. . 3 |- (w = A -> [_w / x]_B = C)
5	4	fvopabn 4749	. 2 |- (-. C e. _V -> ({<.w, v>. | v = [_w / x]_B}` A) = (/))
6		ax-17 1317	. . . 4 |- (y = B -> A.w y = B)
7		ax-17 1317	. . . 4 |- (y = B -> A.v y = B)
8		visset 2295	. . . . . 6 |- w e. _V
9		ax-17 1317	. . . . . 6 |- (v e. w -> A.x v e. w)
10	8, 9	hbcsb1 2568	. . . . 5 |- (v e. [_w / x]_B -> A.x v e. [_w / x]_B)
11	10	hbeleq 1997	. . . 4 |- (v = [_w / x]_B -> A.x v = [_w / x]_B)
12		ax-17 1317	. . . 4 |- (v = [_w / x]_B -> A.y v = [_w / x]_B)
13		id 73	. . . . 5 |- (y = v -> y = v)
14		csbeq1a 2546	. . . . 5 |- (x = w -> B = [_w / x]_B)
15	13, 14	eqeqan12rd 1903	. . . 4 |- ((x = w /\ y = v) -> (y = B <-> v = [_w / x]_B))
16	6, 7, 11, 12, 15	cbvopab 3403	. . 3 |- {<.x, y>. | y = B} = {<.w, v>. | v = [_w / x]_B}
17	16	fveq1i 4682	. 2 |- ({<.x, y>. | y = B}` A) = ({<.w, v>. | v = [_w / x]_B}` A)
18	5, 17	syl5eq 1940	1 |- (-. C e. _V -> ({<.x, y>. | y = B}` A) = (/))

Syntax hints:  -. wn 2   -> wi 3  A.wal 1296   = wceq 1298   e. wcel 1300  _Vcvv 2292  [_csb 2540  (/)c0 2875  {copab 3395  ` cfv 3998

This theorem is referenced by:  rdgsucopabn 5155  frsucopabn 13911

This theorem was proved from axioms:  ax-1 4  ax-2 5  ax-3 6  ax-mp 7  ax-7 1304  ax-gen 1305  ax-8 1306  ax-9 1307  ax-10 1308  ax-11 1309  ax-12 1310  ax-14 1312  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  ax-sep 3438  ax-nul 3445  ax-pow 3481  ax-pr 3524

This theorem depends on definitions:  df-bi 164  df-or 241  df-an 242  df-ex 1327  df-sb 1536  df-eu 1775  df-mo 1776  df-clab 1872  df-cleq 1877  df-clel 1880  df-ne 2019  df-ral 2109  df-rex 2110  df-v 2294  df-sbc 2454  df-csb 2541  df-dif 2597  df-un 2600  df-in 2603  df-ss 2605  df-nul 2876  df-pw 3035  df-sn 3049  df-pr 3050  df-op 3053  df-uni 3178  df-br 3339  df-opab 3396  df-xp 4000  df-cnv 4002  df-dm 4004  df-rn 4005  df-res 4006  df-ima 4007  df-fv 4014

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