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| Mirrors > Home > MPE Home > Th. List > Mathboxes > fcoreslem3 | Structured version Visualization version GIF version | ||
| Description: Lemma 3 for fcores 47181. (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 6660 | . . 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 7015 | . 2 ⊢ (𝜑 → (𝐹 ↾ 𝑃):𝑃–onto→𝐸) |
| 8 | fcores.x | . . 3 ⊢ 𝑋 = (𝐹 ↾ 𝑃) | |
| 9 | foeq1 6739 | . . 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 1541 ∩ cin 3898 ◡ccnv 5620 ran crn 5622 ↾ cres 5623 “ cima 5624 ⟶wf 6485 –onto→wfo 6487 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-12 2182 ax-ext 2705 ax-sep 5238 ax-nul 5248 ax-pr 5374 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-sb 2068 df-mo 2537 df-eu 2566 df-clab 2712 df-cleq 2725 df-clel 2808 df-ral 3050 df-rex 3059 df-rab 3398 df-v 3440 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-nul 4285 df-if 4477 df-sn 4578 df-pr 4580 df-op 4584 df-br 5096 df-opab 5158 df-id 5516 df-xp 5627 df-rel 5628 df-cnv 5629 df-co 5630 df-dm 5631 df-rn 5632 df-res 5633 df-ima 5634 df-fun 6491 df-fn 6492 df-f 6493 df-fo 6495 |
| This theorem is referenced by: fcoreslem4 47180 fcores 47181 fcoresf1lem 47182 fcoresf1 47183 fcoresfo 47185 fcoresfob 47186 |
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