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Theorem fcoreslem3 47414
Description: Lemma 3 for fcores 47416. (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 6671 . . 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 7027 . 2 (𝜑 → (𝐹𝑃):𝑃onto𝐸)
8 fcores.x . . 3 𝑋 = (𝐹𝑃)
9 foeq1 6750 . . 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 3902  ccnv 5631  ran crn 5633  cres 5634  cima 5635  wf 6496  ontowfo 6498
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 5243  ax-pr 5379
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 3402  df-v 3444  df-dif 3906  df-un 3908  df-in 3910  df-ss 3920  df-nul 4288  df-if 4482  df-sn 4583  df-pr 4585  df-op 4589  df-br 5101  df-opab 5163  df-id 5527  df-xp 5638  df-rel 5639  df-cnv 5640  df-co 5641  df-dm 5642  df-rn 5643  df-res 5644  df-ima 5645  df-fun 6502  df-fn 6503  df-f 6504  df-fo 6506
This theorem is referenced by:  fcoreslem4  47415  fcores  47416  fcoresf1lem  47417  fcoresf1  47418  fcoresfo  47420  fcoresfob  47421
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