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| Mirrors > Home > MPE Home > Th. List > Mathboxes > fcoreslem3 | Structured version Visualization version GIF version | ||
| Description: Lemma 3 for fcores 47787. (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 6708 | . . 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 7070 | . 2 ⊢ (𝜑 → (𝐹 ↾ 𝑃):𝑃–onto→𝐸) |
| 8 | fcores.x | . . 3 ⊢ 𝑋 = (𝐹 ↾ 𝑃) | |
| 9 | foeq1 6790 | . . 3 ⊢ (𝑋 = (𝐹 ↾ 𝑃) → (𝑋:𝑃–onto→𝐸 ↔ (𝐹 ↾ 𝑃):𝑃–onto→𝐸)) | |
| 10 | 8, 9 | mp1i 14 | . 2 ⊢ (𝜑 → (𝑋:𝑃–onto→𝐸 ↔ (𝐹 ↾ 𝑃):𝑃–onto→𝐸)) |
| 11 | 7, 10 | mpbird 260 | 1 ⊢ (𝜑 → 𝑋:𝑃–onto→𝐸) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 209 = wceq 1570 ∩ cin 3905 ◡ccnv 5662 ran crn 5664 ↾ cres 5665 “ cima 5666 ⟶wf 6534 –onto→wfo 6536 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1825 ax-4 1839 ax-5 1940 ax-6 1997 ax-7 2038 ax-8 2145 ax-9 2153 ax-12 2213 ax-ext 2735 ax-sep 5258 ax-pr 5406 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1810 df-sb 2097 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2838 df-ral 3080 df-rex 3090 df-rab 3417 df-v 3457 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-nul 4288 df-if 4489 df-sn 4591 df-pr 4593 df-op 4597 df-br 5111 df-opab 5175 df-id 5558 df-xp 5669 df-rel 5670 df-cnv 5671 df-co 5672 df-dm 5673 df-rn 5674 df-res 5675 df-ima 5676 df-fun 6540 df-fn 6541 df-f 6542 df-fo 6544 |
| This theorem is referenced by: fcoreslem4 47786 fcores 47787 fcoresf1lem 47788 fcoresf1 47789 fcoresfo 47791 fcoresfob 47792 |
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