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Theorem fcoreslem3 46260
Description: Lemma 3 for fcores 46262. (Contributed by AV, 13-Sep-2024.)
Hypotheses
Ref Expression
fcores.f (𝜑𝐹:𝐴𝐵)
fcores.e 𝐸 = (ran 𝐹𝐶)
fcores.p 𝑃 = (𝐹𝐶)
fcores.x 𝑋 = (𝐹𝑃)
Assertion
Ref Expression
fcoreslem3 (𝜑𝑋:𝑃onto𝐸)

Proof of Theorem fcoreslem3
StepHypRef Expression
1 fcores.f . . . 4 (𝜑𝐹:𝐴𝐵)
21ffnd 6708 . . 3 (𝜑𝐹 Fn 𝐴)
3 fcores.e . . . 4 𝐸 = (ran 𝐹𝐶)
43a1i 11 . . 3 (𝜑𝐸 = (ran 𝐹𝐶))
5 fcores.p . . . 4 𝑃 = (𝐹𝐶)
65a1i 11 . . 3 (𝜑𝑃 = (𝐹𝐶))
72, 4, 6rescnvimafod 7065 . 2 (𝜑 → (𝐹𝑃):𝑃onto𝐸)
8 fcores.x . . 3 𝑋 = (𝐹𝑃)
9 foeq1 6791 . . 3 (𝑋 = (𝐹𝑃) → (𝑋:𝑃onto𝐸 ↔ (𝐹𝑃):𝑃onto𝐸))
108, 9mp1i 13 . 2 (𝜑 → (𝑋:𝑃onto𝐸 ↔ (𝐹𝑃):𝑃onto𝐸))
117, 10mpbird 257 1 (𝜑𝑋:𝑃onto𝐸)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 205   = wceq 1533  cin 3939  ccnv 5665  ran crn 5667  cres 5668  cima 5669  wf 6529  ontowfo 6531
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1789  ax-4 1803  ax-5 1905  ax-6 1963  ax-7 2003  ax-8 2100  ax-9 2108  ax-10 2129  ax-12 2163  ax-ext 2695  ax-sep 5289  ax-nul 5296  ax-pr 5417
This theorem depends on definitions:  df-bi 206  df-an 396  df-or 845  df-3an 1086  df-tru 1536  df-fal 1546  df-ex 1774  df-nf 1778  df-sb 2060  df-mo 2526  df-eu 2555  df-clab 2702  df-cleq 2716  df-clel 2802  df-ral 3054  df-rex 3063  df-rab 3425  df-v 3468  df-dif 3943  df-un 3945  df-in 3947  df-ss 3957  df-nul 4315  df-if 4521  df-sn 4621  df-pr 4623  df-op 4627  df-br 5139  df-opab 5201  df-id 5564  df-xp 5672  df-rel 5673  df-cnv 5674  df-co 5675  df-dm 5676  df-rn 5677  df-res 5678  df-ima 5679  df-fun 6535  df-fn 6536  df-f 6537  df-fo 6539
This theorem is referenced by:  fcoreslem4  46261  fcores  46262  fcoresf1lem  46263  fcoresf1  46264  fcoresfo  46266  fcoresfob  46267
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