| Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
| 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 3453 | . 2 ⊢ (𝑊 ∈ 𝑉 → 𝑊 ∈ V) | |
| 2 | fveq2 6834 | . . . . 5 ⊢ (𝑤 = 𝑊 → (♯‘𝑤) = (♯‘𝑊)) | |
| 3 | 2 | oveq2d 7379 | . . . 4 ⊢ (𝑤 = 𝑊 → (0..^(♯‘𝑤)) = (0..^(♯‘𝑊))) |
| 4 | id 22 | . . . . 5 ⊢ (𝑤 = 𝑊 → 𝑤 = 𝑊) | |
| 5 | 2 | oveq1d 7378 | . . . . . 6 ⊢ (𝑤 = 𝑊 → ((♯‘𝑤) − 1) = ((♯‘𝑊) − 1)) |
| 6 | 5 | oveq1d 7378 | . . . . 5 ⊢ (𝑤 = 𝑊 → (((♯‘𝑤) − 1) − 𝑥) = (((♯‘𝑊) − 1) − 𝑥)) |
| 7 | 4, 6 | fveq12d 6841 | . . . 4 ⊢ (𝑤 = 𝑊 → (𝑤‘(((♯‘𝑤) − 1) − 𝑥)) = (𝑊‘(((♯‘𝑊) − 1) − 𝑥))) |
| 8 | 3, 7 | mpteq12dv 5166 | . . 3 ⊢ (𝑤 = 𝑊 → (𝑥 ∈ (0..^(♯‘𝑤)) ↦ (𝑤‘(((♯‘𝑤) − 1) − 𝑥))) = (𝑥 ∈ (0..^(♯‘𝑊)) ↦ (𝑊‘(((♯‘𝑊) − 1) − 𝑥)))) |
| 9 | df-reverse 14719 | . . 3 ⊢ reverse = (𝑤 ∈ V ↦ (𝑥 ∈ (0..^(♯‘𝑤)) ↦ (𝑤‘(((♯‘𝑤) − 1) − 𝑥)))) | |
| 10 | ovex 7396 | . . . 4 ⊢ (0..^(♯‘𝑊)) ∈ V | |
| 11 | 10 | mptex 7174 | . . 3 ⊢ (𝑥 ∈ (0..^(♯‘𝑊)) ↦ (𝑊‘(((♯‘𝑊) − 1) − 𝑥))) ∈ V |
| 12 | 8, 9, 11 | fvmpt 6942 | . 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 1547 ∈ wcel 2119 Vcvv 3432 ↦ cmpt 5160 ‘cfv 6492 (class class class)co 7363 0cc0 11036 1c1 11037 − cmin 11375 ..^cfzo 13606 ♯chash 14290 reversecreverse 14718 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1974 ax-7 2015 ax-8 2121 ax-9 2129 ax-10 2152 ax-11 2168 ax-12 2189 ax-ext 2712 ax-rep 5206 ax-sep 5225 ax-nul 5235 ax-pr 5369 |
| This theorem depends on definitions: df-bi 208 df-an 397 df-or 854 df-3an 1094 df-tru 1550 df-fal 1560 df-ex 1787 df-nf 1791 df-sb 2074 df-mo 2543 df-eu 2573 df-clab 2719 df-cleq 2732 df-clel 2815 df-nfc 2889 df-ne 2936 df-ral 3055 df-rex 3065 df-reu 3346 df-rab 3393 df-v 3434 df-sbc 3731 df-csb 3839 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-nul 4269 df-if 4462 df-sn 4563 df-pr 4565 df-op 4569 df-uni 4846 df-iun 4930 df-br 5080 df-opab 5142 df-mpt 5161 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-iota 6448 df-fun 6494 df-fn 6495 df-f 6496 df-f1 6497 df-fo 6498 df-f1o 6499 df-fv 6500 df-ov 7366 df-reverse 14719 |
| This theorem is referenced by: revcl 14721 revlen 14722 revfv 14723 repswrevw 14747 revco 14794 |
| Copyright terms: Public domain | W3C validator |