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Theorem fcoreslem3 47525
Description: Lemma 3 for fcores 47527. (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 6663 . . 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 7019 . 2 (𝜑 → (𝐹𝑃):𝑃onto𝐸)
8 fcores.x . . 3 𝑋 = (𝐹𝑃)
9 foeq1 6742 . . 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 206   = wceq 1542  cin 3889  ccnv 5623  ran crn 5625  cres 5626  cima 5627  wf 6488  ontowfo 6490
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-12 2185  ax-ext 2709  ax-sep 5231  ax-pr 5370
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-sb 2069  df-mo 2540  df-eu 2570  df-clab 2716  df-cleq 2729  df-clel 2812  df-ral 3053  df-rex 3063  df-rab 3391  df-v 3432  df-dif 3893  df-un 3895  df-in 3897  df-ss 3907  df-nul 4275  df-if 4468  df-sn 4569  df-pr 4571  df-op 4575  df-br 5087  df-opab 5149  df-id 5519  df-xp 5630  df-rel 5631  df-cnv 5632  df-co 5633  df-dm 5634  df-rn 5635  df-res 5636  df-ima 5637  df-fun 6494  df-fn 6495  df-f 6496  df-fo 6498
This theorem is referenced by:  fcoreslem4  47526  fcores  47527  fcoresf1lem  47528  fcoresf1  47529  fcoresfo  47531  fcoresfob  47532
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