Theorem quslem 13645

Description: The function in qusval 13644 is a surjection onto a quotient set. (Contributed by Mario Carneiro, 23-Feb-2015.)

Hypotheses

Ref	Expression
qusval.u	⊢ (𝜑 → 𝑈 = (𝑅 /s ∼ ))
qusval.v	⊢ (𝜑 → 𝑉 = (Base‘𝑅))
qusval.f	⊢ 𝐹 = (𝑥 ∈ 𝑉 ↦ [𝑥] ∼ )
qusval.e	⊢ (𝜑 → ∼ ∈ 𝑊)
qusval.r	⊢ (𝜑 → 𝑅 ∈ 𝑍)

Assertion

Ref	Expression
quslem	⊢ (𝜑 → 𝐹:𝑉–onto→(𝑉 / ∼ ))

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

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

Proof of Theorem quslem

Dummy variable 𝑦 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		qusval.e	. . . . . 6 ⊢ (𝜑 → ∼ ∈ 𝑊)
2		ecexg 6811	. . . . . 6 ⊢ ( ∼ ∈ 𝑊 → [𝑥] ∼ ∈ V)
3	1, 2	syl 14	. . . . 5 ⊢ (𝜑 → [𝑥] ∼ ∈ V)
4	3	ralrimivw 2624	. . . 4 ⊢ (𝜑 → ∀𝑥 ∈ 𝑉 [𝑥] ∼ ∈ V)
5		qusval.f	. . . . 5 ⊢ 𝐹 = (𝑥 ∈ 𝑉 ↦ [𝑥] ∼ )
6	5	fnmpt 5510	. . . 4 ⊢ (∀𝑥 ∈ 𝑉 [𝑥] ∼ ∈ V → 𝐹 Fn 𝑉)
7	4, 6	syl 14	. . 3 ⊢ (𝜑 → 𝐹 Fn 𝑉)
8		dffn4 5621	. . 3 ⊢ (𝐹 Fn 𝑉 ↔ 𝐹:𝑉–onto→ran 𝐹)
9	7, 8	sylib 122	. 2 ⊢ (𝜑 → 𝐹:𝑉–onto→ran 𝐹)
10	5	rnmpt 5030	. . . 4 ⊢ ran 𝐹 = {𝑦 ∣ ∃𝑥 ∈ 𝑉 𝑦 = [𝑥] ∼ }
11		df-qs 6813	. . . 4 ⊢ (𝑉 / ∼ ) = {𝑦 ∣ ∃𝑥 ∈ 𝑉 𝑦 = [𝑥] ∼ }
12	10, 11	eqtr4i 2262	. . 3 ⊢ ran 𝐹 = (𝑉 / ∼ )
13		foeq3 5613	. . 3 ⊢ (ran 𝐹 = (𝑉 / ∼ ) → (𝐹:𝑉–onto→ran 𝐹 ↔ 𝐹:𝑉–onto→(𝑉 / ∼ )))
14	12, 13	ax-mp 5	. 2 ⊢ (𝐹:𝑉–onto→ran 𝐹 ↔ 𝐹:𝑉–onto→(𝑉 / ∼ ))
15	9, 14	sylib 122	1 ⊢ (𝜑 → 𝐹:𝑉–onto→(𝑉 / ∼ ))

This proof depends on syntax axioms:   → wi 4   ↔ wb 105   = wceq 1402   ∈ wcel 2209  {cab 2224  ∀wral 2528  ∃wrex 2529  Vcvv 2821   ↦ cmpt 4192  ran crn 4775   Fn wfn 5372  –onto→wfo 5375  ‘cfv 5377  (class class class)co 6085  [cec 6805   / cqs 6806  Basecbs 13352   /_s cqus 13623

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4249  ax-pow 4311  ax-pr 4346  ax-un 4578

This proof depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-v 2823  df-un 3224  df-in 3226  df-ss 3233  df-pw 3690  df-sn 3715  df-pr 3716  df-op 3718  df-uni 3936  df-br 4131  df-opab 4193  df-mpt 4194  df-id 4438  df-xp 4780  df-rel 4781  df-cnv 4782  df-co 4783  df-dm 4784  df-rn 4785  df-res 4786  df-ima 4787  df-fun 5379  df-fn 5380  df-fo 5383  df-ec 6809  df-qs 6813

This theorem is used by:  qusbas  13648  qusaddvallemg  13654  qusaddflemg  13655  qusaddval  13656  qusaddf  13657  qusmulval  13658  qusmulf  13659  qusgrp2  13916  qusrng  14257  qusring2  14371  znzrhfo  14983