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| Mirrors > Home > MPE Home > Th. List > revval | Structured version Visualization version GIF version | ||
| Description: Value of the word reversing function. (Contributed by Stefan O'Rear, 26-Aug-2015.) |
| Ref | Expression |
|---|---|
| revval | ⊢ (𝑊 ∈ 𝑉 → (reverse‘𝑊) = (𝑥 ∈ (0..^(♯‘𝑊)) ↦ (𝑊‘(((♯‘𝑊) − 1) − 𝑥)))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | elex 3480 | . 2 ⊢ (𝑊 ∈ 𝑉 → 𝑊 ∈ V) | |
| 2 | fveq2 6876 | . . . . 5 ⊢ (𝑤 = 𝑊 → (♯‘𝑤) = (♯‘𝑊)) | |
| 3 | 2 | oveq2d 7421 | . . . 4 ⊢ (𝑤 = 𝑊 → (0..^(♯‘𝑤)) = (0..^(♯‘𝑊))) |
| 4 | id 22 | . . . . 5 ⊢ (𝑤 = 𝑊 → 𝑤 = 𝑊) | |
| 5 | 2 | oveq1d 7420 | . . . . . 6 ⊢ (𝑤 = 𝑊 → ((♯‘𝑤) − 1) = ((♯‘𝑊) − 1)) |
| 6 | 5 | oveq1d 7420 | . . . . 5 ⊢ (𝑤 = 𝑊 → (((♯‘𝑤) − 1) − 𝑥) = (((♯‘𝑊) − 1) − 𝑥)) |
| 7 | 4, 6 | fveq12d 6883 | . . . 4 ⊢ (𝑤 = 𝑊 → (𝑤‘(((♯‘𝑤) − 1) − 𝑥)) = (𝑊‘(((♯‘𝑊) − 1) − 𝑥))) |
| 8 | 3, 7 | mpteq12dv 5207 | . . 3 ⊢ (𝑤 = 𝑊 → (𝑥 ∈ (0..^(♯‘𝑤)) ↦ (𝑤‘(((♯‘𝑤) − 1) − 𝑥))) = (𝑥 ∈ (0..^(♯‘𝑊)) ↦ (𝑊‘(((♯‘𝑊) − 1) − 𝑥)))) |
| 9 | df-reverse 14777 | . . 3 ⊢ reverse = (𝑤 ∈ V ↦ (𝑥 ∈ (0..^(♯‘𝑤)) ↦ (𝑤‘(((♯‘𝑤) − 1) − 𝑥)))) | |
| 10 | ovex 7438 | . . . 4 ⊢ (0..^(♯‘𝑊)) ∈ V | |
| 11 | 10 | mptex 7215 | . . 3 ⊢ (𝑥 ∈ (0..^(♯‘𝑊)) ↦ (𝑊‘(((♯‘𝑊) − 1) − 𝑥))) ∈ V |
| 12 | 8, 9, 11 | fvmpt 6986 | . 2 ⊢ (𝑊 ∈ V → (reverse‘𝑊) = (𝑥 ∈ (0..^(♯‘𝑊)) ↦ (𝑊‘(((♯‘𝑊) − 1) − 𝑥)))) |
| 13 | 1, 12 | syl 17 | 1 ⊢ (𝑊 ∈ 𝑉 → (reverse‘𝑊) = (𝑥 ∈ (0..^(♯‘𝑊)) ↦ (𝑊‘(((♯‘𝑊) − 1) − 𝑥)))) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 = wceq 1540 ∈ wcel 2108 Vcvv 3459 ↦ cmpt 5201 ‘cfv 6531 (class class class)co 7405 0cc0 11129 1c1 11130 − cmin 11466 ..^cfzo 13671 ♯chash 14348 reversecreverse 14776 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2007 ax-8 2110 ax-9 2118 ax-10 2141 ax-11 2157 ax-12 2177 ax-ext 2707 ax-rep 5249 ax-sep 5266 ax-nul 5276 ax-pr 5402 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2065 df-mo 2539 df-eu 2568 df-clab 2714 df-cleq 2727 df-clel 2809 df-nfc 2885 df-ne 2933 df-ral 3052 df-rex 3061 df-reu 3360 df-rab 3416 df-v 3461 df-sbc 3766 df-csb 3875 df-dif 3929 df-un 3931 df-in 3933 df-ss 3943 df-nul 4309 df-if 4501 df-sn 4602 df-pr 4604 df-op 4608 df-uni 4884 df-iun 4969 df-br 5120 df-opab 5182 df-mpt 5202 df-id 5548 df-xp 5660 df-rel 5661 df-cnv 5662 df-co 5663 df-dm 5664 df-rn 5665 df-res 5666 df-ima 5667 df-iota 6484 df-fun 6533 df-fn 6534 df-f 6535 df-f1 6536 df-fo 6537 df-f1o 6538 df-fv 6539 df-ov 7408 df-reverse 14777 |
| This theorem is referenced by: revcl 14779 revlen 14780 revfv 14781 repswrevw 14805 revco 14853 |
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