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Mirrors > Home > MPE Home > Th. List > wrdl1s1 | Structured version Visualization version GIF version |
Description: A word of length 1 is a singleton word consisting of the first symbol of the word. (Contributed by AV, 22-Jul-2018.) (Proof shortened by AV, 14-Oct-2018.) |
Ref | Expression |
---|---|
wrdl1s1 | ⊢ (𝑆 ∈ 𝑉 → (𝑊 = 〈“𝑆”〉 ↔ (𝑊 ∈ Word 𝑉 ∧ (♯‘𝑊) = 1 ∧ (𝑊‘0) = 𝑆))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | s1cl 13958 | . . . 4 ⊢ (𝑆 ∈ 𝑉 → 〈“𝑆”〉 ∈ Word 𝑉) | |
2 | s1len 13962 | . . . . 5 ⊢ (♯‘〈“𝑆”〉) = 1 | |
3 | 2 | a1i 11 | . . . 4 ⊢ (𝑆 ∈ 𝑉 → (♯‘〈“𝑆”〉) = 1) |
4 | s1fv 13966 | . . . 4 ⊢ (𝑆 ∈ 𝑉 → (〈“𝑆”〉‘0) = 𝑆) | |
5 | 1, 3, 4 | 3jca 1124 | . . 3 ⊢ (𝑆 ∈ 𝑉 → (〈“𝑆”〉 ∈ Word 𝑉 ∧ (♯‘〈“𝑆”〉) = 1 ∧ (〈“𝑆”〉‘0) = 𝑆)) |
6 | eleq1 2902 | . . . 4 ⊢ (𝑊 = 〈“𝑆”〉 → (𝑊 ∈ Word 𝑉 ↔ 〈“𝑆”〉 ∈ Word 𝑉)) | |
7 | fveqeq2 6681 | . . . 4 ⊢ (𝑊 = 〈“𝑆”〉 → ((♯‘𝑊) = 1 ↔ (♯‘〈“𝑆”〉) = 1)) | |
8 | fveq1 6671 | . . . . 5 ⊢ (𝑊 = 〈“𝑆”〉 → (𝑊‘0) = (〈“𝑆”〉‘0)) | |
9 | 8 | eqeq1d 2825 | . . . 4 ⊢ (𝑊 = 〈“𝑆”〉 → ((𝑊‘0) = 𝑆 ↔ (〈“𝑆”〉‘0) = 𝑆)) |
10 | 6, 7, 9 | 3anbi123d 1432 | . . 3 ⊢ (𝑊 = 〈“𝑆”〉 → ((𝑊 ∈ Word 𝑉 ∧ (♯‘𝑊) = 1 ∧ (𝑊‘0) = 𝑆) ↔ (〈“𝑆”〉 ∈ Word 𝑉 ∧ (♯‘〈“𝑆”〉) = 1 ∧ (〈“𝑆”〉‘0) = 𝑆))) |
11 | 5, 10 | syl5ibrcom 249 | . 2 ⊢ (𝑆 ∈ 𝑉 → (𝑊 = 〈“𝑆”〉 → (𝑊 ∈ Word 𝑉 ∧ (♯‘𝑊) = 1 ∧ (𝑊‘0) = 𝑆))) |
12 | eqs1 13968 | . . . 4 ⊢ ((𝑊 ∈ Word 𝑉 ∧ (♯‘𝑊) = 1) → 𝑊 = 〈“(𝑊‘0)”〉) | |
13 | s1eq 13956 | . . . . 5 ⊢ ((𝑊‘0) = 𝑆 → 〈“(𝑊‘0)”〉 = 〈“𝑆”〉) | |
14 | 13 | eqeq2d 2834 | . . . 4 ⊢ ((𝑊‘0) = 𝑆 → (𝑊 = 〈“(𝑊‘0)”〉 ↔ 𝑊 = 〈“𝑆”〉)) |
15 | 12, 14 | syl5ibcom 247 | . . 3 ⊢ ((𝑊 ∈ Word 𝑉 ∧ (♯‘𝑊) = 1) → ((𝑊‘0) = 𝑆 → 𝑊 = 〈“𝑆”〉)) |
16 | 15 | 3impia 1113 | . 2 ⊢ ((𝑊 ∈ Word 𝑉 ∧ (♯‘𝑊) = 1 ∧ (𝑊‘0) = 𝑆) → 𝑊 = 〈“𝑆”〉) |
17 | 11, 16 | impbid1 227 | 1 ⊢ (𝑆 ∈ 𝑉 → (𝑊 = 〈“𝑆”〉 ↔ (𝑊 ∈ Word 𝑉 ∧ (♯‘𝑊) = 1 ∧ (𝑊‘0) = 𝑆))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 208 ∧ wa 398 ∧ w3a 1083 = wceq 1537 ∈ wcel 2114 ‘cfv 6357 0cc0 10539 1c1 10540 ♯chash 13693 Word cword 13864 〈“cs1 13951 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2795 ax-rep 5192 ax-sep 5205 ax-nul 5212 ax-pow 5268 ax-pr 5332 ax-un 7463 ax-cnex 10595 ax-resscn 10596 ax-1cn 10597 ax-icn 10598 ax-addcl 10599 ax-addrcl 10600 ax-mulcl 10601 ax-mulrcl 10602 ax-mulcom 10603 ax-addass 10604 ax-mulass 10605 ax-distr 10606 ax-i2m1 10607 ax-1ne0 10608 ax-1rid 10609 ax-rnegex 10610 ax-rrecex 10611 ax-cnre 10612 ax-pre-lttri 10613 ax-pre-lttrn 10614 ax-pre-ltadd 10615 ax-pre-mulgt0 10616 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2802 df-cleq 2816 df-clel 2895 df-nfc 2965 df-ne 3019 df-nel 3126 df-ral 3145 df-rex 3146 df-reu 3147 df-rab 3149 df-v 3498 df-sbc 3775 df-csb 3886 df-dif 3941 df-un 3943 df-in 3945 df-ss 3954 df-pss 3956 df-nul 4294 df-if 4470 df-pw 4543 df-sn 4570 df-pr 4572 df-tp 4574 df-op 4576 df-uni 4841 df-int 4879 df-iun 4923 df-br 5069 df-opab 5131 df-mpt 5149 df-tr 5175 df-id 5462 df-eprel 5467 df-po 5476 df-so 5477 df-fr 5516 df-we 5518 df-xp 5563 df-rel 5564 df-cnv 5565 df-co 5566 df-dm 5567 df-rn 5568 df-res 5569 df-ima 5570 df-pred 6150 df-ord 6196 df-on 6197 df-lim 6198 df-suc 6199 df-iota 6316 df-fun 6359 df-fn 6360 df-f 6361 df-f1 6362 df-fo 6363 df-f1o 6364 df-fv 6365 df-riota 7116 df-ov 7161 df-oprab 7162 df-mpo 7163 df-om 7583 df-1st 7691 df-2nd 7692 df-wrecs 7949 df-recs 8010 df-rdg 8048 df-1o 8104 df-oadd 8108 df-er 8291 df-en 8512 df-dom 8513 df-sdom 8514 df-fin 8515 df-card 9370 df-pnf 10679 df-mnf 10680 df-xr 10681 df-ltxr 10682 df-le 10683 df-sub 10874 df-neg 10875 df-nn 11641 df-n0 11901 df-z 11985 df-uz 12247 df-fz 12896 df-fzo 13037 df-hash 13694 df-word 13865 df-s1 13952 |
This theorem is referenced by: rusgrnumwwlkb0 27752 clwwlknon1 27878 |
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