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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 3185 | . 2 ⊢ (𝑊 ∈ 𝑉 → 𝑊 ∈ V) | |
2 | fveq2 6103 | . . . . 5 ⊢ (𝑤 = 𝑊 → (#‘𝑤) = (#‘𝑊)) | |
3 | 2 | oveq2d 6565 | . . . 4 ⊢ (𝑤 = 𝑊 → (0..^(#‘𝑤)) = (0..^(#‘𝑊))) |
4 | id 22 | . . . . 5 ⊢ (𝑤 = 𝑊 → 𝑤 = 𝑊) | |
5 | 2 | oveq1d 6564 | . . . . . 6 ⊢ (𝑤 = 𝑊 → ((#‘𝑤) − 1) = ((#‘𝑊) − 1)) |
6 | 5 | oveq1d 6564 | . . . . 5 ⊢ (𝑤 = 𝑊 → (((#‘𝑤) − 1) − 𝑥) = (((#‘𝑊) − 1) − 𝑥)) |
7 | 4, 6 | fveq12d 6109 | . . . 4 ⊢ (𝑤 = 𝑊 → (𝑤‘(((#‘𝑤) − 1) − 𝑥)) = (𝑊‘(((#‘𝑊) − 1) − 𝑥))) |
8 | 3, 7 | mpteq12dv 4663 | . . 3 ⊢ (𝑤 = 𝑊 → (𝑥 ∈ (0..^(#‘𝑤)) ↦ (𝑤‘(((#‘𝑤) − 1) − 𝑥))) = (𝑥 ∈ (0..^(#‘𝑊)) ↦ (𝑊‘(((#‘𝑊) − 1) − 𝑥)))) |
9 | df-reverse 13160 | . . 3 ⊢ reverse = (𝑤 ∈ V ↦ (𝑥 ∈ (0..^(#‘𝑤)) ↦ (𝑤‘(((#‘𝑤) − 1) − 𝑥)))) | |
10 | ovex 6577 | . . . 4 ⊢ (0..^(#‘𝑊)) ∈ V | |
11 | 10 | mptex 6390 | . . 3 ⊢ (𝑥 ∈ (0..^(#‘𝑊)) ↦ (𝑊‘(((#‘𝑊) − 1) − 𝑥))) ∈ V |
12 | 8, 9, 11 | fvmpt 6191 | . 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 1475 ∈ wcel 1977 Vcvv 3173 ↦ cmpt 4643 ‘cfv 5804 (class class class)co 6549 0cc0 9815 1c1 9816 − cmin 10145 ..^cfzo 12334 #chash 12979 reversecreverse 13152 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-9 1986 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 ax-rep 4699 ax-sep 4709 ax-nul 4717 ax-pr 4833 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-3an 1033 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-eu 2462 df-mo 2463 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-ne 2782 df-ral 2901 df-rex 2902 df-reu 2903 df-rab 2905 df-v 3175 df-sbc 3403 df-csb 3500 df-dif 3543 df-un 3545 df-in 3547 df-ss 3554 df-nul 3875 df-if 4037 df-sn 4126 df-pr 4128 df-op 4132 df-uni 4373 df-iun 4457 df-br 4584 df-opab 4644 df-mpt 4645 df-id 4953 df-xp 5044 df-rel 5045 df-cnv 5046 df-co 5047 df-dm 5048 df-rn 5049 df-res 5050 df-ima 5051 df-iota 5768 df-fun 5806 df-fn 5807 df-f 5808 df-f1 5809 df-fo 5810 df-f1o 5811 df-fv 5812 df-ov 6552 df-reverse 13160 |
This theorem is referenced by: revcl 13361 revlen 13362 revfv 13363 repswrevw 13384 revco 13431 |
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