![]() |
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 3499 | . 2 ⊢ (𝑊 ∈ 𝑉 → 𝑊 ∈ V) | |
2 | fveq2 6907 | . . . . 5 ⊢ (𝑤 = 𝑊 → (♯‘𝑤) = (♯‘𝑊)) | |
3 | 2 | oveq2d 7447 | . . . 4 ⊢ (𝑤 = 𝑊 → (0..^(♯‘𝑤)) = (0..^(♯‘𝑊))) |
4 | id 22 | . . . . 5 ⊢ (𝑤 = 𝑊 → 𝑤 = 𝑊) | |
5 | 2 | oveq1d 7446 | . . . . . 6 ⊢ (𝑤 = 𝑊 → ((♯‘𝑤) − 1) = ((♯‘𝑊) − 1)) |
6 | 5 | oveq1d 7446 | . . . . 5 ⊢ (𝑤 = 𝑊 → (((♯‘𝑤) − 1) − 𝑥) = (((♯‘𝑊) − 1) − 𝑥)) |
7 | 4, 6 | fveq12d 6914 | . . . 4 ⊢ (𝑤 = 𝑊 → (𝑤‘(((♯‘𝑤) − 1) − 𝑥)) = (𝑊‘(((♯‘𝑊) − 1) − 𝑥))) |
8 | 3, 7 | mpteq12dv 5239 | . . 3 ⊢ (𝑤 = 𝑊 → (𝑥 ∈ (0..^(♯‘𝑤)) ↦ (𝑤‘(((♯‘𝑤) − 1) − 𝑥))) = (𝑥 ∈ (0..^(♯‘𝑊)) ↦ (𝑊‘(((♯‘𝑊) − 1) − 𝑥)))) |
9 | df-reverse 14794 | . . 3 ⊢ reverse = (𝑤 ∈ V ↦ (𝑥 ∈ (0..^(♯‘𝑤)) ↦ (𝑤‘(((♯‘𝑤) − 1) − 𝑥)))) | |
10 | ovex 7464 | . . . 4 ⊢ (0..^(♯‘𝑊)) ∈ V | |
11 | 10 | mptex 7243 | . . 3 ⊢ (𝑥 ∈ (0..^(♯‘𝑊)) ↦ (𝑊‘(((♯‘𝑊) − 1) − 𝑥))) ∈ V |
12 | 8, 9, 11 | fvmpt 7016 | . 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 1537 ∈ wcel 2106 Vcvv 3478 ↦ cmpt 5231 ‘cfv 6563 (class class class)co 7431 0cc0 11153 1c1 11154 − cmin 11490 ..^cfzo 13691 ♯chash 14366 reversecreverse 14793 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1908 ax-6 1965 ax-7 2005 ax-8 2108 ax-9 2116 ax-10 2139 ax-11 2155 ax-12 2175 ax-ext 2706 ax-rep 5285 ax-sep 5302 ax-nul 5312 ax-pr 5438 |
This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1540 df-fal 1550 df-ex 1777 df-nf 1781 df-sb 2063 df-mo 2538 df-eu 2567 df-clab 2713 df-cleq 2727 df-clel 2814 df-nfc 2890 df-ne 2939 df-ral 3060 df-rex 3069 df-reu 3379 df-rab 3434 df-v 3480 df-sbc 3792 df-csb 3909 df-dif 3966 df-un 3968 df-in 3970 df-ss 3980 df-nul 4340 df-if 4532 df-sn 4632 df-pr 4634 df-op 4638 df-uni 4913 df-iun 4998 df-br 5149 df-opab 5211 df-mpt 5232 df-id 5583 df-xp 5695 df-rel 5696 df-cnv 5697 df-co 5698 df-dm 5699 df-rn 5700 df-res 5701 df-ima 5702 df-iota 6516 df-fun 6565 df-fn 6566 df-f 6567 df-f1 6568 df-fo 6569 df-f1o 6570 df-fv 6571 df-ov 7434 df-reverse 14794 |
This theorem is referenced by: revcl 14796 revlen 14797 revfv 14798 repswrevw 14822 revco 14870 |
Copyright terms: Public domain | W3C validator |