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| Mirrors > Home > ILE Home > Th. List > cats2catd | GIF version | ||
| Description: Closure of concatenation of concatenations with singleton words. (Contributed by AV, 1-Mar-2021.) (Revised by Jim Kingdon, 19-Jan-2026.) |
| Ref | Expression |
|---|---|
| cats2catd.b | ⊢ (𝜑 → 𝐵 ∈ Word V) |
| cats2catd.d | ⊢ (𝜑 → 𝐷 ∈ Word V) |
| cats2catd.x | ⊢ (𝜑 → 𝑋 ∈ 𝑉) |
| cats2catd.y | ⊢ (𝜑 → 𝑌 ∈ 𝑊) |
| cats2catd.a | ⊢ (𝜑 → 𝐴 = (𝐵 ++ 〈“𝑋”〉)) |
| cats2catd.c | ⊢ (𝜑 → 𝐶 = (〈“𝑌”〉 ++ 𝐷)) |
| Ref | Expression |
|---|---|
| cats2catd | ⊢ (𝜑 → (𝐴 ++ 𝐶) = ((𝐵 ++ 〈“𝑋𝑌”〉) ++ 𝐷)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | cats2catd.a | . . 3 ⊢ (𝜑 → 𝐴 = (𝐵 ++ 〈“𝑋”〉)) | |
| 2 | cats2catd.c | . . 3 ⊢ (𝜑 → 𝐶 = (〈“𝑌”〉 ++ 𝐷)) | |
| 3 | 1, 2 | oveq12d 6031 | . 2 ⊢ (𝜑 → (𝐴 ++ 𝐶) = ((𝐵 ++ 〈“𝑋”〉) ++ (〈“𝑌”〉 ++ 𝐷))) |
| 4 | cats2catd.b | . . . 4 ⊢ (𝜑 → 𝐵 ∈ Word V) | |
| 5 | cats2catd.x | . . . . . 6 ⊢ (𝜑 → 𝑋 ∈ 𝑉) | |
| 6 | 5 | s1cld 11192 | . . . . 5 ⊢ (𝜑 → 〈“𝑋”〉 ∈ Word 𝑉) |
| 7 | wrdv 11122 | . . . . 5 ⊢ (〈“𝑋”〉 ∈ Word 𝑉 → 〈“𝑋”〉 ∈ Word V) | |
| 8 | 6, 7 | syl 14 | . . . 4 ⊢ (𝜑 → 〈“𝑋”〉 ∈ Word V) |
| 9 | ccatcl 11163 | . . . 4 ⊢ ((𝐵 ∈ Word V ∧ 〈“𝑋”〉 ∈ Word V) → (𝐵 ++ 〈“𝑋”〉) ∈ Word V) | |
| 10 | 4, 8, 9 | syl2anc 411 | . . 3 ⊢ (𝜑 → (𝐵 ++ 〈“𝑋”〉) ∈ Word V) |
| 11 | cats2catd.y | . . . . 5 ⊢ (𝜑 → 𝑌 ∈ 𝑊) | |
| 12 | 11 | s1cld 11192 | . . . 4 ⊢ (𝜑 → 〈“𝑌”〉 ∈ Word 𝑊) |
| 13 | wrdv 11122 | . . . 4 ⊢ (〈“𝑌”〉 ∈ Word 𝑊 → 〈“𝑌”〉 ∈ Word V) | |
| 14 | 12, 13 | syl 14 | . . 3 ⊢ (𝜑 → 〈“𝑌”〉 ∈ Word V) |
| 15 | cats2catd.d | . . 3 ⊢ (𝜑 → 𝐷 ∈ Word V) | |
| 16 | ccatass 11178 | . . 3 ⊢ (((𝐵 ++ 〈“𝑋”〉) ∈ Word V ∧ 〈“𝑌”〉 ∈ Word V ∧ 𝐷 ∈ Word V) → (((𝐵 ++ 〈“𝑋”〉) ++ 〈“𝑌”〉) ++ 𝐷) = ((𝐵 ++ 〈“𝑋”〉) ++ (〈“𝑌”〉 ++ 𝐷))) | |
| 17 | 10, 14, 15, 16 | syl3anc 1271 | . 2 ⊢ (𝜑 → (((𝐵 ++ 〈“𝑋”〉) ++ 〈“𝑌”〉) ++ 𝐷) = ((𝐵 ++ 〈“𝑋”〉) ++ (〈“𝑌”〉 ++ 𝐷))) |
| 18 | ccatass 11178 | . . . . 5 ⊢ ((𝐵 ∈ Word V ∧ 〈“𝑋”〉 ∈ Word V ∧ 〈“𝑌”〉 ∈ Word V) → ((𝐵 ++ 〈“𝑋”〉) ++ 〈“𝑌”〉) = (𝐵 ++ (〈“𝑋”〉 ++ 〈“𝑌”〉))) | |
| 19 | 4, 8, 14, 18 | syl3anc 1271 | . . . 4 ⊢ (𝜑 → ((𝐵 ++ 〈“𝑋”〉) ++ 〈“𝑌”〉) = (𝐵 ++ (〈“𝑋”〉 ++ 〈“𝑌”〉))) |
| 20 | df-s2 11330 | . . . . . 6 ⊢ 〈“𝑋𝑌”〉 = (〈“𝑋”〉 ++ 〈“𝑌”〉) | |
| 21 | 20 | eqcomi 2233 | . . . . 5 ⊢ (〈“𝑋”〉 ++ 〈“𝑌”〉) = 〈“𝑋𝑌”〉 |
| 22 | 21 | oveq2i 6024 | . . . 4 ⊢ (𝐵 ++ (〈“𝑋”〉 ++ 〈“𝑌”〉)) = (𝐵 ++ 〈“𝑋𝑌”〉) |
| 23 | 19, 22 | eqtrdi 2278 | . . 3 ⊢ (𝜑 → ((𝐵 ++ 〈“𝑋”〉) ++ 〈“𝑌”〉) = (𝐵 ++ 〈“𝑋𝑌”〉)) |
| 24 | 23 | oveq1d 6028 | . 2 ⊢ (𝜑 → (((𝐵 ++ 〈“𝑋”〉) ++ 〈“𝑌”〉) ++ 𝐷) = ((𝐵 ++ 〈“𝑋𝑌”〉) ++ 𝐷)) |
| 25 | 3, 17, 24 | 3eqtr2d 2268 | 1 ⊢ (𝜑 → (𝐴 ++ 𝐶) = ((𝐵 ++ 〈“𝑋𝑌”〉) ++ 𝐷)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 = wceq 1395 ∈ wcel 2200 Vcvv 2800 (class class class)co 6013 Word cword 11106 ++ cconcat 11160 〈“cs1 11185 〈“cs2 11323 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 617 ax-in2 618 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-13 2202 ax-14 2203 ax-ext 2211 ax-coll 4202 ax-sep 4205 ax-nul 4213 ax-pow 4262 ax-pr 4297 ax-un 4528 ax-setind 4633 ax-iinf 4684 ax-cnex 8116 ax-resscn 8117 ax-1cn 8118 ax-1re 8119 ax-icn 8120 ax-addcl 8121 ax-addrcl 8122 ax-mulcl 8123 ax-addcom 8125 ax-addass 8127 ax-distr 8129 ax-i2m1 8130 ax-0lt1 8131 ax-0id 8133 ax-rnegex 8134 ax-cnre 8136 ax-pre-ltirr 8137 ax-pre-ltwlin 8138 ax-pre-lttrn 8139 ax-pre-apti 8140 ax-pre-ltadd 8141 |
| This theorem depends on definitions: df-bi 117 df-dc 840 df-3or 1003 df-3an 1004 df-tru 1398 df-fal 1401 df-nf 1507 df-sb 1809 df-eu 2080 df-mo 2081 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ne 2401 df-nel 2496 df-ral 2513 df-rex 2514 df-reu 2515 df-rab 2517 df-v 2802 df-sbc 3030 df-csb 3126 df-dif 3200 df-un 3202 df-in 3204 df-ss 3211 df-nul 3493 df-if 3604 df-pw 3652 df-sn 3673 df-pr 3674 df-op 3676 df-uni 3892 df-int 3927 df-iun 3970 df-br 4087 df-opab 4149 df-mpt 4150 df-tr 4186 df-id 4388 df-iord 4461 df-on 4463 df-ilim 4464 df-suc 4466 df-iom 4687 df-xp 4729 df-rel 4730 df-cnv 4731 df-co 4732 df-dm 4733 df-rn 4734 df-res 4735 df-ima 4736 df-iota 5284 df-fun 5326 df-fn 5327 df-f 5328 df-f1 5329 df-fo 5330 df-f1o 5331 df-fv 5332 df-riota 5966 df-ov 6016 df-oprab 6017 df-mpo 6018 df-1st 6298 df-2nd 6299 df-recs 6466 df-frec 6552 df-1o 6577 df-er 6697 df-en 6905 df-dom 6906 df-fin 6907 df-pnf 8209 df-mnf 8210 df-xr 8211 df-ltxr 8212 df-le 8213 df-sub 8345 df-neg 8346 df-inn 9137 df-n0 9396 df-z 9473 df-uz 9749 df-fz 10237 df-fzo 10371 df-ihash 11031 df-word 11107 df-concat 11161 df-s1 11186 df-s2 11330 |
| This theorem is referenced by: (None) |
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