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Theorem wspn0 29433

Description: If there are no vertices, then there are no simple paths (of any length), too. (Contributed by Alexander van der Vekens, 11-Mar-2018.) (Revised by AV, 16-May-2021.) (Proof shortened by AV, 13-Mar-2022.)

**Hypothesis**
Ref	Expression
wspn0.v	⊢ 𝑉 = (Vtx‘𝐺)

**Assertion**
Ref	Expression
wspn0	⊢ (𝑉 = ∅ → (𝑁 WSPathsN 𝐺) = ∅)

Proof of Theorem wspn0 Dummy variables 𝑓 𝑤 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		wspthsn 29357	. 2 ⊢ (𝑁 WSPathsN 𝐺) = {𝑤 ∈ (𝑁 WWalksN 𝐺) ∣ ∃𝑓 𝑓(SPaths‘𝐺)𝑤}
2		wwlknbp1 29353	. . . . . 6 ⊢ (𝑤 ∈ (𝑁 WWalksN 𝐺) → (𝑁 ∈ ℕ₀ ∧ 𝑤 ∈ Word (Vtx‘𝐺) ∧ (♯‘𝑤) = (𝑁 + 1)))
3		wspn0.v	. . . . . . . . . . . . 13 ⊢ 𝑉 = (Vtx‘𝐺)
4	3	eqeq1i 2737	. . . . . . . . . . . 12 ⊢ (𝑉 = ∅ ↔ (Vtx‘𝐺) = ∅)
5		wrdeq 14490	. . . . . . . . . . . 12 ⊢ ((Vtx‘𝐺) = ∅ → Word (Vtx‘𝐺) = Word ∅)
6	4, 5	sylbi 216	. . . . . . . . . . 11 ⊢ (𝑉 = ∅ → Word (Vtx‘𝐺) = Word ∅)
7	6	eleq2d 2819	. . . . . . . . . 10 ⊢ (𝑉 = ∅ → (𝑤 ∈ Word (Vtx‘𝐺) ↔ 𝑤 ∈ Word ∅))
8		0wrd0 14494	. . . . . . . . . 10 ⊢ (𝑤 ∈ Word ∅ ↔ 𝑤 = ∅)
9	7, 8	bitrdi 286	. . . . . . . . 9 ⊢ (𝑉 = ∅ → (𝑤 ∈ Word (Vtx‘𝐺) ↔ 𝑤 = ∅))
10		fveq2 6891	. . . . . . . . . . . . . . 15 ⊢ (𝑤 = ∅ → (♯‘𝑤) = (♯‘∅))
11		hash0 14331	. . . . . . . . . . . . . . 15 ⊢ (♯‘∅) = 0
12	10, 11	eqtrdi 2788	. . . . . . . . . . . . . 14 ⊢ (𝑤 = ∅ → (♯‘𝑤) = 0)
13	12	eqeq1d 2734	. . . . . . . . . . . . 13 ⊢ (𝑤 = ∅ → ((♯‘𝑤) = (𝑁 + 1) ↔ 0 = (𝑁 + 1)))
14	13	adantl 482	. . . . . . . . . . . 12 ⊢ ((𝑁 ∈ ℕ₀ ∧ 𝑤 = ∅) → ((♯‘𝑤) = (𝑁 + 1) ↔ 0 = (𝑁 + 1)))
15		nn0p1gt0 12505	. . . . . . . . . . . . . . 15 ⊢ (𝑁 ∈ ℕ₀ → 0 < (𝑁 + 1))
16	15	gt0ne0d 11782	. . . . . . . . . . . . . 14 ⊢ (𝑁 ∈ ℕ₀ → (𝑁 + 1) ≠ 0)
17		eqneqall 2951	. . . . . . . . . . . . . . 15 ⊢ ((𝑁 + 1) = 0 → ((𝑁 + 1) ≠ 0 → ¬ ∃𝑓 𝑓(SPaths‘𝐺)𝑤))
18	17	eqcoms 2740	. . . . . . . . . . . . . 14 ⊢ (0 = (𝑁 + 1) → ((𝑁 + 1) ≠ 0 → ¬ ∃𝑓 𝑓(SPaths‘𝐺)𝑤))
19	16, 18	syl5com 31	. . . . . . . . . . . . 13 ⊢ (𝑁 ∈ ℕ₀ → (0 = (𝑁 + 1) → ¬ ∃𝑓 𝑓(SPaths‘𝐺)𝑤))
20	19	adantr 481	. . . . . . . . . . . 12 ⊢ ((𝑁 ∈ ℕ₀ ∧ 𝑤 = ∅) → (0 = (𝑁 + 1) → ¬ ∃𝑓 𝑓(SPaths‘𝐺)𝑤))
21	14, 20	sylbid 239	. . . . . . . . . . 11 ⊢ ((𝑁 ∈ ℕ₀ ∧ 𝑤 = ∅) → ((♯‘𝑤) = (𝑁 + 1) → ¬ ∃𝑓 𝑓(SPaths‘𝐺)𝑤))
22	21	expcom 414	. . . . . . . . . 10 ⊢ (𝑤 = ∅ → (𝑁 ∈ ℕ₀ → ((♯‘𝑤) = (𝑁 + 1) → ¬ ∃𝑓 𝑓(SPaths‘𝐺)𝑤)))
23	22	com23 86	. . . . . . . . 9 ⊢ (𝑤 = ∅ → ((♯‘𝑤) = (𝑁 + 1) → (𝑁 ∈ ℕ₀ → ¬ ∃𝑓 𝑓(SPaths‘𝐺)𝑤)))
24	9, 23	syl6bi 252	. . . . . . . 8 ⊢ (𝑉 = ∅ → (𝑤 ∈ Word (Vtx‘𝐺) → ((♯‘𝑤) = (𝑁 + 1) → (𝑁 ∈ ℕ₀ → ¬ ∃𝑓 𝑓(SPaths‘𝐺)𝑤))))
25	24	com14 96	. . . . . . 7 ⊢ (𝑁 ∈ ℕ₀ → (𝑤 ∈ Word (Vtx‘𝐺) → ((♯‘𝑤) = (𝑁 + 1) → (𝑉 = ∅ → ¬ ∃𝑓 𝑓(SPaths‘𝐺)𝑤))))
26	25	3imp 1111	. . . . . 6 ⊢ ((𝑁 ∈ ℕ₀ ∧ 𝑤 ∈ Word (Vtx‘𝐺) ∧ (♯‘𝑤) = (𝑁 + 1)) → (𝑉 = ∅ → ¬ ∃𝑓 𝑓(SPaths‘𝐺)𝑤))
27	2, 26	syl 17	. . . . 5 ⊢ (𝑤 ∈ (𝑁 WWalksN 𝐺) → (𝑉 = ∅ → ¬ ∃𝑓 𝑓(SPaths‘𝐺)𝑤))
28	27	impcom 408	. . . 4 ⊢ ((𝑉 = ∅ ∧ 𝑤 ∈ (𝑁 WWalksN 𝐺)) → ¬ ∃𝑓 𝑓(SPaths‘𝐺)𝑤)
29	28	ralrimiva 3146	. . 3 ⊢ (𝑉 = ∅ → ∀𝑤 ∈ (𝑁 WWalksN 𝐺) ¬ ∃𝑓 𝑓(SPaths‘𝐺)𝑤)
30		rabeq0 4384	. . 3 ⊢ ({𝑤 ∈ (𝑁 WWalksN 𝐺) ∣ ∃𝑓 𝑓(SPaths‘𝐺)𝑤} = ∅ ↔ ∀𝑤 ∈ (𝑁 WWalksN 𝐺) ¬ ∃𝑓 𝑓(SPaths‘𝐺)𝑤)
31	29, 30	sylibr 233	. 2 ⊢ (𝑉 = ∅ → {𝑤 ∈ (𝑁 WWalksN 𝐺) ∣ ∃𝑓 𝑓(SPaths‘𝐺)𝑤} = ∅)
32	1, 31	eqtrid 2784	1 ⊢ (𝑉 = ∅ → (𝑁 WSPathsN 𝐺) = ∅)

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 205 ∧ wa 396 ∧ w3a 1087 = wceq 1541 ∃wex 1781 ∈ wcel 2106 ≠ wne 2940 ∀wral 3061 {crab 3432 ∅c0 4322 class class class wbr 5148 ‘cfv 6543 (class class class)co 7411 0cc0 11112 1c1 11113 + caddc 11115 ℕ₀cn0 12476 ♯chash 14294 Word cword 14468 Vtxcvtx 28511 SPathscspths 29225 WWalksN cwwlksn 29335 WSPathsN cwwspthsn 29337

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2703 ax-rep 5285 ax-sep 5299 ax-nul 5306 ax-pow 5363 ax-pr 5427 ax-un 7727 ax-cnex 11168 ax-resscn 11169 ax-1cn 11170 ax-icn 11171 ax-addcl 11172 ax-addrcl 11173 ax-mulcl 11174 ax-mulrcl 11175 ax-mulcom 11176 ax-addass 11177 ax-mulass 11178 ax-distr 11179 ax-i2m1 11180 ax-1ne0 11181 ax-1rid 11182 ax-rnegex 11183 ax-rrecex 11184 ax-cnre 11185 ax-pre-lttri 11186 ax-pre-lttrn 11187 ax-pre-ltadd 11188 ax-pre-mulgt0 11189

This theorem depends on definitions: df-bi 206 df-an 397 df-or 846 df-3or 1088 df-3an 1089 df-tru 1544 df-fal 1554 df-ex 1782 df-nf 1786 df-sb 2068 df-mo 2534 df-eu 2563 df-clab 2710 df-cleq 2724 df-clel 2810 df-nfc 2885 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-reu 3377 df-rab 3433 df-v 3476 df-sbc 3778 df-csb 3894 df-dif 3951 df-un 3953 df-in 3955 df-ss 3965 df-pss 3967 df-nul 4323 df-if 4529 df-pw 4604 df-sn 4629 df-pr 4631 df-op 4635 df-uni 4909 df-int 4951 df-iun 4999 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5574 df-eprel 5580 df-po 5588 df-so 5589 df-fr 5631 df-we 5633 df-xp 5682 df-rel 5683 df-cnv 5684 df-co 5685 df-dm 5686 df-rn 5687 df-res 5688 df-ima 5689 df-pred 6300 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 df-iota 6495 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-riota 7367 df-ov 7414 df-oprab 7415 df-mpo 7416 df-om 7858 df-1st 7977 df-2nd 7978 df-frecs 8268 df-wrecs 8299 df-recs 8373 df-rdg 8412 df-1o 8468 df-er 8705 df-map 8824 df-en 8942 df-dom 8943 df-sdom 8944 df-fin 8945 df-card 9936 df-pnf 11254 df-mnf 11255 df-xr 11256 df-ltxr 11257 df-le 11258 df-sub 11450 df-neg 11451 df-nn 12217 df-n0 12477 df-z 12563 df-uz 12827 df-fz 13489 df-fzo 13632 df-hash 14295 df-word 14469 df-wwlks 29339 df-wwlksn 29340 df-wspthsn 29342

This theorem is referenced by: (None)

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