s2elclwwlknon2 - Intuitionistic Logic Explorer

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Theorem s2elclwwlknon2 16882

Description: Sufficient conditions of a doubleton word to represent a closed walk on vertex 𝑋 of length 2. (Contributed by AV, 11-May-2022.)

**Hypotheses**
Ref	Expression
clwwlknon2.c	⊢ 𝐶 = (ClWWalksNOn‘𝐺)
clwwlknon2x.v	⊢ 𝑉 = (Vtx‘𝐺)
clwwlknon2x.e	⊢ 𝐸 = (Edg‘𝐺)

**Assertion**
Ref	Expression
s2elclwwlknon2	⊢ ((𝑋 ∈ 𝑉 ∧ 𝑌 ∈ 𝑉 ∧ {𝑋, 𝑌} ∈ 𝐸) → ⟨“𝑋𝑌”⟩ ∈ (𝑋𝐶2))

Proof of Theorem s2elclwwlknon2 Dummy variable 𝑤 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		s2cl 11579	. . 3 ⊢ ((𝑋 ∈ 𝑉 ∧ 𝑌 ∈ 𝑉) → ⟨“𝑋𝑌”⟩ ∈ Word 𝑉)
2	1	3adant3 1048	. 2 ⊢ ((𝑋 ∈ 𝑉 ∧ 𝑌 ∈ 𝑉 ∧ {𝑋, 𝑌} ∈ 𝐸) → ⟨“𝑋𝑌”⟩ ∈ Word 𝑉)
3		s2leng 11583	. . . 4 ⊢ ((𝑋 ∈ 𝑉 ∧ 𝑌 ∈ 𝑉) → (♯‘⟨“𝑋𝑌”⟩) = 2)
4	3	3adant3 1048	. . 3 ⊢ ((𝑋 ∈ 𝑉 ∧ 𝑌 ∈ 𝑉 ∧ {𝑋, 𝑌} ∈ 𝐸) → (♯‘⟨“𝑋𝑌”⟩) = 2)
5		s2fv0g 11581	. . . . . . 7 ⊢ ((𝑋 ∈ 𝑉 ∧ 𝑌 ∈ 𝑉) → (⟨“𝑋𝑌”⟩‘0) = 𝑋)
6		s2fv1g 11582	. . . . . . 7 ⊢ ((𝑋 ∈ 𝑉 ∧ 𝑌 ∈ 𝑉) → (⟨“𝑋𝑌”⟩‘1) = 𝑌)
7	5, 6	preq12d 3796	. . . . . 6 ⊢ ((𝑋 ∈ 𝑉 ∧ 𝑌 ∈ 𝑉) → {(⟨“𝑋𝑌”⟩‘0), (⟨“𝑋𝑌”⟩‘1)} = {𝑋, 𝑌})
8	7	eqcomd 2244	. . . . 5 ⊢ ((𝑋 ∈ 𝑉 ∧ 𝑌 ∈ 𝑉) → {𝑋, 𝑌} = {(⟨“𝑋𝑌”⟩‘0), (⟨“𝑋𝑌”⟩‘1)})
9	8	eleq1d 2307	. . . 4 ⊢ ((𝑋 ∈ 𝑉 ∧ 𝑌 ∈ 𝑉) → ({𝑋, 𝑌} ∈ 𝐸 ↔ {(⟨“𝑋𝑌”⟩‘0), (⟨“𝑋𝑌”⟩‘1)} ∈ 𝐸))
10	9	biimp3a 1386	. . 3 ⊢ ((𝑋 ∈ 𝑉 ∧ 𝑌 ∈ 𝑉 ∧ {𝑋, 𝑌} ∈ 𝐸) → {(⟨“𝑋𝑌”⟩‘0), (⟨“𝑋𝑌”⟩‘1)} ∈ 𝐸)
11	5	3adant3 1048	. . 3 ⊢ ((𝑋 ∈ 𝑉 ∧ 𝑌 ∈ 𝑉 ∧ {𝑋, 𝑌} ∈ 𝐸) → (⟨“𝑋𝑌”⟩‘0) = 𝑋)
12	4, 10, 11	3jca 1208	. 2 ⊢ ((𝑋 ∈ 𝑉 ∧ 𝑌 ∈ 𝑉 ∧ {𝑋, 𝑌} ∈ 𝐸) → ((♯‘⟨“𝑋𝑌”⟩) = 2 ∧ {(⟨“𝑋𝑌”⟩‘0), (⟨“𝑋𝑌”⟩‘1)} ∈ 𝐸 ∧ (⟨“𝑋𝑌”⟩‘0) = 𝑋))
13		fveqeq2 5707	. . . 4 ⊢ (𝑤 = ⟨“𝑋𝑌”⟩ → ((♯‘𝑤) = 2 ↔ (♯‘⟨“𝑋𝑌”⟩) = 2))
14		fveq1 5697	. . . . . 6 ⊢ (𝑤 = ⟨“𝑋𝑌”⟩ → (𝑤‘0) = (⟨“𝑋𝑌”⟩‘0))
15		fveq1 5697	. . . . . 6 ⊢ (𝑤 = ⟨“𝑋𝑌”⟩ → (𝑤‘1) = (⟨“𝑋𝑌”⟩‘1))
16	14, 15	preq12d 3796	. . . . 5 ⊢ (𝑤 = ⟨“𝑋𝑌”⟩ → {(𝑤‘0), (𝑤‘1)} = {(⟨“𝑋𝑌”⟩‘0), (⟨“𝑋𝑌”⟩‘1)})
17	16	eleq1d 2307	. . . 4 ⊢ (𝑤 = ⟨“𝑋𝑌”⟩ → ({(𝑤‘0), (𝑤‘1)} ∈ 𝐸 ↔ {(⟨“𝑋𝑌”⟩‘0), (⟨“𝑋𝑌”⟩‘1)} ∈ 𝐸))
18	14	eqeq1d 2247	. . . 4 ⊢ (𝑤 = ⟨“𝑋𝑌”⟩ → ((𝑤‘0) = 𝑋 ↔ (⟨“𝑋𝑌”⟩‘0) = 𝑋))
19	13, 17, 18	3anbi123d 1353	. . 3 ⊢ (𝑤 = ⟨“𝑋𝑌”⟩ → (((♯‘𝑤) = 2 ∧ {(𝑤‘0), (𝑤‘1)} ∈ 𝐸 ∧ (𝑤‘0) = 𝑋) ↔ ((♯‘⟨“𝑋𝑌”⟩) = 2 ∧ {(⟨“𝑋𝑌”⟩‘0), (⟨“𝑋𝑌”⟩‘1)} ∈ 𝐸 ∧ (⟨“𝑋𝑌”⟩‘0) = 𝑋)))
20		clwwlknon2.c	. . . 4 ⊢ 𝐶 = (ClWWalksNOn‘𝐺)
21		clwwlknon2x.v	. . . 4 ⊢ 𝑉 = (Vtx‘𝐺)
22		clwwlknon2x.e	. . . 4 ⊢ 𝐸 = (Edg‘𝐺)
23	20, 21, 22	clwwlknon2x 16881	. . 3 ⊢ (𝑋𝐶2) = {𝑤 ∈ Word 𝑉 ∣ ((♯‘𝑤) = 2 ∧ {(𝑤‘0), (𝑤‘1)} ∈ 𝐸 ∧ (𝑤‘0) = 𝑋)}
24	19, 23	elrab2 2985	. 2 ⊢ (⟨“𝑋𝑌”⟩ ∈ (𝑋𝐶2) ↔ (⟨“𝑋𝑌”⟩ ∈ Word 𝑉 ∧ ((♯‘⟨“𝑋𝑌”⟩) = 2 ∧ {(⟨“𝑋𝑌”⟩‘0), (⟨“𝑋𝑌”⟩‘1)} ∈ 𝐸 ∧ (⟨“𝑋𝑌”⟩‘0) = 𝑋)))
25	2, 12, 24	sylanbrc 421	1 ⊢ ((𝑋 ∈ 𝑉 ∧ 𝑌 ∈ 𝑉 ∧ {𝑋, 𝑌} ∈ 𝐸) → ⟨“𝑋𝑌”⟩ ∈ (𝑋𝐶2))

Colors of variables: wff set class

This proof depends on syntax axioms: → wi 4 ∧ wa 104 ∧ w3a 1009 = wceq 1402 ∈ wcel 2209 {cpr 3710 ‘cfv 5380 (class class class)co 6088 0cc0 8185 1c1 8186 2c2 9364 ♯chash 11236 Word cword 11326 ⟨“cs2 11543 Vtxcvtx 16458 Edgcedg 16503 ClWWalksNOncclwwlknon 16872

This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 623 ax-in2 624 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-coll 4248 ax-sep 4251 ax-nul 4261 ax-pow 4313 ax-pr 4348 ax-un 4580 ax-setind 4686 ax-iinf 4737 ax-cnex 8276 ax-resscn 8277 ax-1cn 8278 ax-1re 8279 ax-icn 8280 ax-addcl 8281 ax-addrcl 8282 ax-mulcl 8283 ax-mulrcl 8284 ax-addcom 8285 ax-mulcom 8286 ax-addass 8287 ax-mulass 8288 ax-distr 8289 ax-i2m1 8290 ax-0lt1 8291 ax-1rid 8292 ax-0id 8293 ax-rnegex 8294 ax-precex 8295 ax-cnre 8296 ax-pre-ltirr 8297 ax-pre-ltwlin 8298 ax-pre-lttrn 8299 ax-pre-apti 8300 ax-pre-ltadd 8301 ax-pre-mulgt0 8302

This proof depends on definitions: df-bi 117 df-dc 847 df-3or 1010 df-3an 1011 df-tru 1405 df-fal 1408 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ne 2421 df-nel 2516 df-ral 2533 df-rex 2534 df-reu 2535 df-rab 2537 df-v 2823 df-sbc 3052 df-csb 3148 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-nul 3521 df-if 3639 df-pw 3690 df-sn 3715 df-pr 3716 df-op 3718 df-uni 3936 df-int 3971 df-iun 4014 df-br 4132 df-opab 4194 df-mpt 4195 df-tr 4232 df-id 4440 df-iord 4513 df-on 4515 df-ilim 4516 df-suc 4518 df-iom 4740 df-xp 4782 df-rel 4783 df-cnv 4784 df-co 4785 df-dm 4786 df-rn 4787 df-res 4788 df-ima 4789 df-iota 5340 df-fun 5382 df-fn 5383 df-f 5384 df-f1 5385 df-fo 5386 df-f1o 5387 df-fv 5388 df-riota 6041 df-ov 6091 df-oprab 6092 df-mpo 6093 df-1st 6378 df-2nd 6379 df-recs 6580 df-frec 6666 df-1o 6691 df-er 6811 df-map 6928 df-en 7027 df-dom 7028 df-fin 7029 df-pnf 8368 df-mnf 8369 df-xr 8370 df-ltxr 8371 df-le 8372 df-sub 8506 df-neg 8507 df-reap 8911 df-ap 8918 df-inn 9314 df-2 9372 df-n0 9575 df-z 9656 df-uz 9938 df-fz 10429 df-fzo 10567 df-ihash 11237 df-word 11327 df-lsw 11372 df-concat 11381 df-s1 11406 df-s2 11550 df-ndx 13413 df-slot 13414 df-base 13416 df-vtx 16460 df-clwwlk 16838 df-clwwlkn 16850 df-clwwlknon 16873

This theorem is used by: (None)

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