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| Mirrors > Home > MPE Home > Th. List > Mathboxes > fcoreslem3 | Structured version Visualization version GIF version | ||
| Description: Lemma 3 for fcores 47349. (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 6664 | . . 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 7020 | . 2 ⊢ (𝜑 → (𝐹 ↾ 𝑃):𝑃–onto→𝐸) |
| 8 | fcores.x | . . 3 ⊢ 𝑋 = (𝐹 ↾ 𝑃) | |
| 9 | foeq1 6743 | . . 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 1542 ∩ cin 3901 ◡ccnv 5624 ran crn 5626 ↾ cres 5627 “ cima 5628 ⟶wf 6489 –onto→wfo 6491 |
| 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 5242 ax-nul 5252 ax-pr 5378 |
| 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 3062 df-rab 3401 df-v 3443 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-nul 4287 df-if 4481 df-sn 4582 df-pr 4584 df-op 4588 df-br 5100 df-opab 5162 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 6495 df-fn 6496 df-f 6497 df-fo 6499 |
| This theorem is referenced by: fcoreslem4 47348 fcores 47349 fcoresf1lem 47350 fcoresf1 47351 fcoresfo 47353 fcoresfob 47354 |
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