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Theorem quslem 13704
Description: The function in qusval 13703 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.
StepHypRef Expression
1 qusval.e . . . . . 6 (𝜑 → ∼ ∈ 𝑊)
2 ecexg 6815 . . . . . 6 ( ∼ ∈ 𝑊 → [𝑥] ∼ ∈ V)
31, 2syl 14 . . . . 5 (𝜑 → [𝑥] ∼ ∈ V)
43ralrimivw 2624 . . . 4 (𝜑 → ∀𝑥 ∈ 𝑉 [𝑥] ∼ ∈ V)
5 qusval.f . . . . 5 𝐹 = (𝑥 ∈ 𝑉 ↦ [𝑥] ∼ )
65fnmpt 5513 . . . 4 (∀𝑥 ∈ 𝑉 [𝑥] ∼ ∈ V → 𝐹 Fn 𝑉)
74, 6syl 14 . . 3 (𝜑 → 𝐹 Fn 𝑉)
8 dffn4 5624 . . 3 (𝐹 Fn 𝑉 ↔ 𝐹:𝑉–onto→ran 𝐹)
97, 8sylib 122 . 2 (𝜑 → 𝐹:𝑉–onto→ran 𝐹)
105rnmpt 5032 . . . 4 ran 𝐹 = {𝑦 ∣ ∃𝑥 ∈ 𝑉 𝑦 = [𝑥] ∼ }
11 df-qs 6817 . . . 4 (𝑉 / ∼ ) = {𝑦 ∣ ∃𝑥 ∈ 𝑉 𝑦 = [𝑥] ∼ }
1210, 11eqtr4i 2262 . . 3 ran 𝐹 = (𝑉 / ∼ )
13 foeq3 5616 . . 3 (ran 𝐹 = (𝑉 / ∼ ) → (𝐹:𝑉–onto→ran 𝐹 ↔ 𝐹:𝑉–onto→(𝑉 / ∼ )))
1412, 13ax-mp 5 . 2 (𝐹:𝑉–onto→ran 𝐹 ↔ 𝐹:𝑉–onto→(𝑉 / ∼ ))
159, 14sylib 122 1 (𝜑 → 𝐹:𝑉–onto→(𝑉 / ∼ ))
Colors of variables:    wff set class
This proof depends on syntax axioms:   → wi 4   ↔ wb 105   = wceq 1402   ∈ wcel 2209  {cab 2224  ∀wral 2528  ∃wrex 2529  Vcvv 2821   ↦ cmpt 4193  ran crn 4777   Fn wfn 5375  –onto→wfo 5378  ‘cfv 5380  (class class class)co 6088  [cec 6809   / cqs 6810  Basecbs 13410   /s cqus 13682
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 4251  ax-pow 4313  ax-pr 4348  ax-un 4580
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 4132  df-opab 4194  df-mpt 4195  df-id 4440  df-xp 4782  df-rel 4783  df-cnv 4784  df-co 4785  df-dm 4786  df-rn 4787  df-res 4788  df-ima 4789  df-fun 5382  df-fn 5383  df-fo 5386  df-ec 6813  df-qs 6817
This theorem is used by:  qusbas  13707  qusaddvallemg  13713  qusaddflemg  13714  qusaddval  13715  qusaddf  13716  qusmulval  13717  qusmulf  13718  qusgrp2  13975  qusrng  14364  qusring2  14480  znzrhfo  15092
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