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Mirrors > Home > MPE Home > Th. List > Mathboxes > fcoreslem3 | Structured version Visualization version GIF version |
Description: Lemma 3 for fcores 46982. (Contributed by AV, 13-Sep-2024.) |
Ref | Expression |
---|---|
fcores.f | ⊢ (𝜑 → 𝐹:𝐴⟶𝐵) |
fcores.e | ⊢ 𝐸 = (ran 𝐹 ∩ 𝐶) |
fcores.p | ⊢ 𝑃 = (◡𝐹 “ 𝐶) |
fcores.x | ⊢ 𝑋 = (𝐹 ↾ 𝑃) |
Ref | Expression |
---|---|
fcoreslem3 | ⊢ (𝜑 → 𝑋:𝑃–onto→𝐸) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | fcores.f | . . . 4 ⊢ (𝜑 → 𝐹:𝐴⟶𝐵) | |
2 | 1 | ffnd 6748 | . . 3 ⊢ (𝜑 → 𝐹 Fn 𝐴) |
3 | fcores.e | . . . 4 ⊢ 𝐸 = (ran 𝐹 ∩ 𝐶) | |
4 | 3 | a1i 11 | . . 3 ⊢ (𝜑 → 𝐸 = (ran 𝐹 ∩ 𝐶)) |
5 | fcores.p | . . . 4 ⊢ 𝑃 = (◡𝐹 “ 𝐶) | |
6 | 5 | a1i 11 | . . 3 ⊢ (𝜑 → 𝑃 = (◡𝐹 “ 𝐶)) |
7 | 2, 4, 6 | rescnvimafod 7107 | . 2 ⊢ (𝜑 → (𝐹 ↾ 𝑃):𝑃–onto→𝐸) |
8 | fcores.x | . . 3 ⊢ 𝑋 = (𝐹 ↾ 𝑃) | |
9 | foeq1 6830 | . . 3 ⊢ (𝑋 = (𝐹 ↾ 𝑃) → (𝑋:𝑃–onto→𝐸 ↔ (𝐹 ↾ 𝑃):𝑃–onto→𝐸)) | |
10 | 8, 9 | mp1i 13 | . 2 ⊢ (𝜑 → (𝑋:𝑃–onto→𝐸 ↔ (𝐹 ↾ 𝑃):𝑃–onto→𝐸)) |
11 | 7, 10 | mpbird 257 | 1 ⊢ (𝜑 → 𝑋:𝑃–onto→𝐸) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 206 = wceq 1537 ∩ cin 3975 ◡ccnv 5699 ran crn 5701 ↾ cres 5702 “ cima 5703 ⟶wf 6569 –onto→wfo 6571 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1793 ax-4 1807 ax-5 1909 ax-6 1967 ax-7 2007 ax-8 2110 ax-9 2118 ax-12 2178 ax-ext 2711 ax-sep 5317 ax-nul 5324 ax-pr 5447 |
This theorem depends on definitions: df-bi 207 df-an 396 df-or 847 df-3an 1089 df-tru 1540 df-fal 1550 df-ex 1778 df-sb 2065 df-mo 2543 df-eu 2572 df-clab 2718 df-cleq 2732 df-clel 2819 df-ral 3068 df-rex 3077 df-rab 3444 df-v 3490 df-dif 3979 df-un 3981 df-in 3983 df-ss 3993 df-nul 4353 df-if 4549 df-sn 4649 df-pr 4651 df-op 4655 df-br 5167 df-opab 5229 df-id 5593 df-xp 5706 df-rel 5707 df-cnv 5708 df-co 5709 df-dm 5710 df-rn 5711 df-res 5712 df-ima 5713 df-fun 6575 df-fn 6576 df-f 6577 df-fo 6579 |
This theorem is referenced by: fcoreslem4 46981 fcores 46982 fcoresf1lem 46983 fcoresf1 46984 fcoresfo 46986 fcoresfob 46987 |
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