Users' Mathboxes Mathbox for Alexander van der Vekens < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >   Mathboxes  >  fcoreslem3 Structured version   Visualization version   GIF version

Theorem fcoreslem3 47535
Description: Lemma 3 for fcores 47537. (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 7021 . 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 258 1 (𝜑𝑋:𝑃onto𝐸)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 207   = wceq 1547  cin 3889  ccnv 5624  ran crn 5626  cres 5627  cima 5628  wf 6488  ontowfo 6490
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1802  ax-4 1816  ax-5 1917  ax-6 1974  ax-7 2015  ax-8 2121  ax-9 2129  ax-12 2189  ax-ext 2712  ax-sep 5225  ax-pr 5369
This theorem depends on definitions:  df-bi 208  df-an 397  df-or 854  df-3an 1094  df-tru 1550  df-fal 1560  df-ex 1787  df-sb 2074  df-mo 2543  df-eu 2573  df-clab 2719  df-cleq 2732  df-clel 2815  df-ral 3055  df-rex 3065  df-rab 3393  df-v 3434  df-dif 3893  df-un 3895  df-in 3897  df-ss 3907  df-nul 4269  df-if 4462  df-sn 4563  df-pr 4565  df-op 4569  df-br 5080  df-opab 5142  df-id 5520  df-xp 5631  df-rel 5632  df-cnv 5633  df-co 5634  df-dm 5635  df-rn 5636  df-res 5637  df-ima 5638  df-fun 6494  df-fn 6495  df-f 6496  df-fo 6498
This theorem is referenced by:  fcoreslem4  47536  fcores  47537  fcoresf1lem  47538  fcoresf1  47539  fcoresfo  47541  fcoresfob  47542
  Copyright terms: Public domain W3C validator