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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 3476 | . 2 ⊢ (𝑊 ∈ 𝑉 → 𝑊 ∈ V) | |
| 2 | fveq2 6883 | . . . . 5 ⊢ (𝑤 = 𝑊 → (♯‘𝑤) = (♯‘𝑊)) | |
| 3 | 2 | oveq2d 7428 | . . . 4 ⊢ (𝑤 = 𝑊 → (0..^(♯‘𝑤)) = (0..^(♯‘𝑊))) |
| 4 | id 23 | . . . . 5 ⊢ (𝑤 = 𝑊 → 𝑤 = 𝑊) | |
| 5 | 2 | oveq1d 7427 | . . . . . 6 ⊢ (𝑤 = 𝑊 → ((♯‘𝑤) − 1) = ((♯‘𝑊) − 1)) |
| 6 | 5 | oveq1d 7427 | . . . . 5 ⊢ (𝑤 = 𝑊 → (((♯‘𝑤) − 1) − 𝑥) = (((♯‘𝑊) − 1) − 𝑥)) |
| 7 | 4, 6 | fveq12d 6890 | . . . 4 ⊢ (𝑤 = 𝑊 → (𝑤‘(((♯‘𝑤) − 1) − 𝑥)) = (𝑊‘(((♯‘𝑊) − 1) − 𝑥))) |
| 8 | 3, 7 | mpteq12dv 5199 | . . 3 ⊢ (𝑤 = 𝑊 → (𝑥 ∈ (0..^(♯‘𝑤)) ↦ (𝑤‘(((♯‘𝑤) − 1) − 𝑥))) = (𝑥 ∈ (0..^(♯‘𝑊)) ↦ (𝑊‘(((♯‘𝑊) − 1) − 𝑥)))) |
| 9 | df-reverse 14798 | . . 3 ⊢ reverse = (𝑤 ∈ V ↦ (𝑥 ∈ (0..^(♯‘𝑤)) ↦ (𝑤‘(((♯‘𝑤) − 1) − 𝑥)))) | |
| 10 | ovex 7445 | . . . 4 ⊢ (0..^(♯‘𝑊)) ∈ V | |
| 11 | 10 | mptex 7223 | . . 3 ⊢ (𝑥 ∈ (0..^(♯‘𝑊)) ↦ (𝑊‘(((♯‘𝑊) − 1) − 𝑥))) ∈ V |
| 12 | 8, 9, 11 | fvmpt 6991 | . 2 ⊢ (𝑊 ∈ V → (reverse‘𝑊) = (𝑥 ∈ (0..^(♯‘𝑊)) ↦ (𝑊‘(((♯‘𝑊) − 1) − 𝑥)))) |
| 13 | 1, 12 | syl 18 | 1 ⊢ (𝑊 ∈ 𝑉 → (reverse‘𝑊) = (𝑥 ∈ (0..^(♯‘𝑊)) ↦ (𝑊‘(((♯‘𝑊) − 1) − 𝑥)))) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 = wceq 1570 ∈ wcel 2143 Vcvv 3455 ↦ cmpt 5193 ‘cfv 6538 (class class class)co 7412 0cc0 11101 1c1 11102 − cmin 11442 ..^cfzo 13684 ♯chash 14368 reversecreverse 14797 |
| 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-10 2176 ax-11 2192 ax-12 2213 ax-ext 2735 ax-rep 5239 ax-sep 5258 ax-nul 5270 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-nf 1814 df-sb 2097 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2838 df-nfc 2912 df-ne 2959 df-ral 3080 df-rex 3090 df-reu 3370 df-rab 3417 df-v 3457 df-sbc 3746 df-csb 3855 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-uni 4874 df-iun 4959 df-br 5111 df-opab 5175 df-mpt 5194 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-iota 6494 df-fun 6540 df-fn 6541 df-f 6542 df-f1 6543 df-fo 6544 df-f1o 6545 df-fv 6546 df-ov 7415 df-reverse 14798 |
| This theorem is referenced by: revcl 14800 revlen 14801 revfv 14802 repswrevw 14826 revco 14873 |
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