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Mirrors > Home > MPE Home > Th. List > cshws0 | Structured version Visualization version GIF version |
Description: The size of the set of (different!) words resulting by cyclically shifting an empty word is 0. (Contributed by AV, 8-Nov-2018.) |
Ref | Expression |
---|---|
cshwrepswhash1.m | ⊢ 𝑀 = {𝑤 ∈ Word 𝑉 ∣ ∃𝑛 ∈ (0..^(♯‘𝑊))(𝑊 cyclShift 𝑛) = 𝑤} |
Ref | Expression |
---|---|
cshws0 | ⊢ (𝑊 = ∅ → (♯‘𝑀) = 0) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cshwrepswhash1.m | . . . 4 ⊢ 𝑀 = {𝑤 ∈ Word 𝑉 ∣ ∃𝑛 ∈ (0..^(♯‘𝑊))(𝑊 cyclShift 𝑛) = 𝑤} | |
2 | 0ex 5226 | . . . . . . . . . . . 12 ⊢ ∅ ∈ V | |
3 | eleq1 2826 | . . . . . . . . . . . 12 ⊢ (𝑊 = ∅ → (𝑊 ∈ V ↔ ∅ ∈ V)) | |
4 | 2, 3 | mpbiri 257 | . . . . . . . . . . 11 ⊢ (𝑊 = ∅ → 𝑊 ∈ V) |
5 | hasheq0 14006 | . . . . . . . . . . . 12 ⊢ (𝑊 ∈ V → ((♯‘𝑊) = 0 ↔ 𝑊 = ∅)) | |
6 | 5 | bicomd 222 | . . . . . . . . . . 11 ⊢ (𝑊 ∈ V → (𝑊 = ∅ ↔ (♯‘𝑊) = 0)) |
7 | 4, 6 | syl 17 | . . . . . . . . . 10 ⊢ (𝑊 = ∅ → (𝑊 = ∅ ↔ (♯‘𝑊) = 0)) |
8 | 7 | ibi 266 | . . . . . . . . 9 ⊢ (𝑊 = ∅ → (♯‘𝑊) = 0) |
9 | 8 | oveq2d 7271 | . . . . . . . 8 ⊢ (𝑊 = ∅ → (0..^(♯‘𝑊)) = (0..^0)) |
10 | fzo0 13339 | . . . . . . . 8 ⊢ (0..^0) = ∅ | |
11 | 9, 10 | eqtrdi 2795 | . . . . . . 7 ⊢ (𝑊 = ∅ → (0..^(♯‘𝑊)) = ∅) |
12 | 11 | rexeqdv 3340 | . . . . . 6 ⊢ (𝑊 = ∅ → (∃𝑛 ∈ (0..^(♯‘𝑊))(𝑊 cyclShift 𝑛) = 𝑤 ↔ ∃𝑛 ∈ ∅ (𝑊 cyclShift 𝑛) = 𝑤)) |
13 | 12 | rabbidv 3404 | . . . . 5 ⊢ (𝑊 = ∅ → {𝑤 ∈ Word 𝑉 ∣ ∃𝑛 ∈ (0..^(♯‘𝑊))(𝑊 cyclShift 𝑛) = 𝑤} = {𝑤 ∈ Word 𝑉 ∣ ∃𝑛 ∈ ∅ (𝑊 cyclShift 𝑛) = 𝑤}) |
14 | rex0 4288 | . . . . . . . 8 ⊢ ¬ ∃𝑛 ∈ ∅ (𝑊 cyclShift 𝑛) = 𝑤 | |
15 | 14 | a1i 11 | . . . . . . 7 ⊢ (𝑊 = ∅ → ¬ ∃𝑛 ∈ ∅ (𝑊 cyclShift 𝑛) = 𝑤) |
16 | 15 | ralrimivw 3108 | . . . . . 6 ⊢ (𝑊 = ∅ → ∀𝑤 ∈ Word 𝑉 ¬ ∃𝑛 ∈ ∅ (𝑊 cyclShift 𝑛) = 𝑤) |
17 | rabeq0 4315 | . . . . . 6 ⊢ ({𝑤 ∈ Word 𝑉 ∣ ∃𝑛 ∈ ∅ (𝑊 cyclShift 𝑛) = 𝑤} = ∅ ↔ ∀𝑤 ∈ Word 𝑉 ¬ ∃𝑛 ∈ ∅ (𝑊 cyclShift 𝑛) = 𝑤) | |
18 | 16, 17 | sylibr 233 | . . . . 5 ⊢ (𝑊 = ∅ → {𝑤 ∈ Word 𝑉 ∣ ∃𝑛 ∈ ∅ (𝑊 cyclShift 𝑛) = 𝑤} = ∅) |
19 | 13, 18 | eqtrd 2778 | . . . 4 ⊢ (𝑊 = ∅ → {𝑤 ∈ Word 𝑉 ∣ ∃𝑛 ∈ (0..^(♯‘𝑊))(𝑊 cyclShift 𝑛) = 𝑤} = ∅) |
20 | 1, 19 | eqtrid 2790 | . . 3 ⊢ (𝑊 = ∅ → 𝑀 = ∅) |
21 | 20 | fveq2d 6760 | . 2 ⊢ (𝑊 = ∅ → (♯‘𝑀) = (♯‘∅)) |
22 | hash0 14010 | . 2 ⊢ (♯‘∅) = 0 | |
23 | 21, 22 | eqtrdi 2795 | 1 ⊢ (𝑊 = ∅ → (♯‘𝑀) = 0) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ↔ wb 205 = wceq 1539 ∈ wcel 2108 ∀wral 3063 ∃wrex 3064 {crab 3067 Vcvv 3422 ∅c0 4253 ‘cfv 6418 (class class class)co 7255 0cc0 10802 ..^cfzo 13311 ♯chash 13972 Word cword 14145 cyclShift ccsh 14429 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1799 ax-4 1813 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2110 ax-9 2118 ax-10 2139 ax-11 2156 ax-12 2173 ax-ext 2709 ax-sep 5218 ax-nul 5225 ax-pow 5283 ax-pr 5347 ax-un 7566 ax-cnex 10858 ax-resscn 10859 ax-1cn 10860 ax-icn 10861 ax-addcl 10862 ax-addrcl 10863 ax-mulcl 10864 ax-mulrcl 10865 ax-mulcom 10866 ax-addass 10867 ax-mulass 10868 ax-distr 10869 ax-i2m1 10870 ax-1ne0 10871 ax-1rid 10872 ax-rnegex 10873 ax-rrecex 10874 ax-cnre 10875 ax-pre-lttri 10876 ax-pre-lttrn 10877 ax-pre-ltadd 10878 ax-pre-mulgt0 10879 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1784 df-nf 1788 df-sb 2069 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2817 df-nfc 2888 df-ne 2943 df-nel 3049 df-ral 3068 df-rex 3069 df-reu 3070 df-rab 3072 df-v 3424 df-sbc 3712 df-csb 3829 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-pss 3902 df-nul 4254 df-if 4457 df-pw 4532 df-sn 4559 df-pr 4561 df-tp 4563 df-op 4565 df-uni 4837 df-int 4877 df-iun 4923 df-br 5071 df-opab 5133 df-mpt 5154 df-tr 5188 df-id 5480 df-eprel 5486 df-po 5494 df-so 5495 df-fr 5535 df-we 5537 df-xp 5586 df-rel 5587 df-cnv 5588 df-co 5589 df-dm 5590 df-rn 5591 df-res 5592 df-ima 5593 df-pred 6191 df-ord 6254 df-on 6255 df-lim 6256 df-suc 6257 df-iota 6376 df-fun 6420 df-fn 6421 df-f 6422 df-f1 6423 df-fo 6424 df-f1o 6425 df-fv 6426 df-riota 7212 df-ov 7258 df-oprab 7259 df-mpo 7260 df-om 7688 df-1st 7804 df-2nd 7805 df-frecs 8068 df-wrecs 8099 df-recs 8173 df-rdg 8212 df-1o 8267 df-er 8456 df-en 8692 df-dom 8693 df-sdom 8694 df-fin 8695 df-card 9628 df-pnf 10942 df-mnf 10943 df-xr 10944 df-ltxr 10945 df-le 10946 df-sub 11137 df-neg 11138 df-nn 11904 df-n0 12164 df-z 12250 df-uz 12512 df-fz 13169 df-fzo 13312 df-hash 13973 |
This theorem is referenced by: (None) |
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