Theorem divsfvalg 13411

Description: Value of the function in qusval 13405. (Contributed by Mario Carneiro, 24-Feb-2015.) (Revised by Mario Carneiro, 12-Aug-2015.) (Revised by AV, 12-Jul-2024.)

Hypotheses

Ref	Expression
ercpbl.r	⊢ (𝜑 → ∼ Er 𝑉)
ercpbl.v	⊢ (𝜑 → 𝑉 ∈ 𝑊)
ercpbl.f	⊢ 𝐹 = (𝑥 ∈ 𝑉 ↦ [𝑥] ∼ )
ercpbl.a	⊢ (𝜑 → 𝐴 ∈ 𝑉)

Assertion

Ref	Expression
divsfvalg	⊢ (𝜑 → (𝐹‘𝐴) = [𝐴] ∼ )

Distinct variable groups:   𝑥, ∼   𝑥,𝐴   𝑥,𝑉   𝜑,𝑥

Allowed substitution hints:   𝐹(𝑥)   𝑊(𝑥)

Proof of Theorem divsfvalg

Step	Hyp	Ref	Expression
1		ercpbl.f	. 2 ⊢ 𝐹 = (𝑥 ∈ 𝑉 ↦ [𝑥] ∼ )
2		eceq1 6736	. 2 ⊢ (𝑥 = 𝐴 → [𝑥] ∼ = [𝐴] ∼ )
3		ercpbl.a	. 2 ⊢ (𝜑 → 𝐴 ∈ 𝑉)
4		ercpbl.v	. . 3 ⊢ (𝜑 → 𝑉 ∈ 𝑊)
5		ercpbl.r	. . . 4 ⊢ (𝜑 → ∼ Er 𝑉)
6	5	ecss 6744	. . 3 ⊢ (𝜑 → [𝐴] ∼ ⊆ 𝑉)
7	4, 6	ssexd 4229	. 2 ⊢ (𝜑 → [𝐴] ∼ ∈ V)
8	1, 2, 3, 7	fvmptd3 5740	1 ⊢ (𝜑 → (𝐹‘𝐴) = [𝐴] ∼ )

Syntax hints:   → wi 4   = wceq 1397   ∈ wcel 2202  Vcvv 2802   ↦ cmpt 4150  ‘cfv 5326   Er wer 6698  [cec 6699

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-14 2205  ax-ext 2213  ax-sep 4207  ax-pow 4264  ax-pr 4299

This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ral 2515  df-rex 2516  df-v 2804  df-sbc 3032  df-csb 3128  df-un 3204  df-in 3206  df-ss 3213  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-br 4089  df-opab 4151  df-mpt 4152  df-id 4390  df-xp 4731  df-rel 4732  df-cnv 4733  df-co 4734  df-dm 4735  df-rn 4736  df-res 4737  df-ima 4738  df-iota 5286  df-fun 5328  df-fv 5334  df-er 6701  df-ec 6703

This theorem is referenced by:  ercpbllemg  13412  qusaddvallemg  13415  qusgrp2  13699  qusring2  14078