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Theorem rusgrnumwwlkb0 26938
Description: Induction base 0 for rusgrnumwwlk 26942. Here, we do not need the regularity of the graph yet. (Contributed by Alexander van der Vekens, 24-Jul-2018.) (Revised by AV, 7-May-2021.)
Hypotheses
Ref Expression
rusgrnumwwlk.v 𝑉 = (Vtx‘𝐺)
rusgrnumwwlk.l 𝐿 = (𝑣𝑉, 𝑛 ∈ ℕ0 ↦ (#‘{𝑤 ∈ (𝑛 WWalksN 𝐺) ∣ (𝑤‘0) = 𝑣}))
Assertion
Ref Expression
rusgrnumwwlkb0 ((𝐺 ∈ USPGraph ∧ 𝑃𝑉) → (𝑃𝐿0) = 1)
Distinct variable groups:   𝑛,𝐺,𝑣,𝑤   𝑃,𝑛,𝑣,𝑤   𝑛,𝑉,𝑣,𝑤
Allowed substitution hints:   𝐿(𝑤,𝑣,𝑛)

Proof of Theorem rusgrnumwwlkb0
StepHypRef Expression
1 simpr 476 . . 3 ((𝐺 ∈ USPGraph ∧ 𝑃𝑉) → 𝑃𝑉)
2 0nn0 11345 . . 3 0 ∈ ℕ0
3 rusgrnumwwlk.v . . . 4 𝑉 = (Vtx‘𝐺)
4 rusgrnumwwlk.l . . . 4 𝐿 = (𝑣𝑉, 𝑛 ∈ ℕ0 ↦ (#‘{𝑤 ∈ (𝑛 WWalksN 𝐺) ∣ (𝑤‘0) = 𝑣}))
53, 4rusgrnumwwlklem 26937 . . 3 ((𝑃𝑉 ∧ 0 ∈ ℕ0) → (𝑃𝐿0) = (#‘{𝑤 ∈ (0 WWalksN 𝐺) ∣ (𝑤‘0) = 𝑃}))
61, 2, 5sylancl 695 . 2 ((𝐺 ∈ USPGraph ∧ 𝑃𝑉) → (𝑃𝐿0) = (#‘{𝑤 ∈ (0 WWalksN 𝐺) ∣ (𝑤‘0) = 𝑃}))
7 df-rab 2950 . . . . 5 {𝑤 ∈ (0 WWalksN 𝐺) ∣ (𝑤‘0) = 𝑃} = {𝑤 ∣ (𝑤 ∈ (0 WWalksN 𝐺) ∧ (𝑤‘0) = 𝑃)}
87a1i 11 . . . 4 ((𝐺 ∈ USPGraph ∧ 𝑃𝑉) → {𝑤 ∈ (0 WWalksN 𝐺) ∣ (𝑤‘0) = 𝑃} = {𝑤 ∣ (𝑤 ∈ (0 WWalksN 𝐺) ∧ (𝑤‘0) = 𝑃)})
9 wwlksn0s 26815 . . . . . . . . 9 (0 WWalksN 𝐺) = {𝑤 ∈ Word (Vtx‘𝐺) ∣ (#‘𝑤) = 1}
109a1i 11 . . . . . . . 8 ((𝐺 ∈ USPGraph ∧ 𝑃𝑉) → (0 WWalksN 𝐺) = {𝑤 ∈ Word (Vtx‘𝐺) ∣ (#‘𝑤) = 1})
1110eleq2d 2716 . . . . . . 7 ((𝐺 ∈ USPGraph ∧ 𝑃𝑉) → (𝑤 ∈ (0 WWalksN 𝐺) ↔ 𝑤 ∈ {𝑤 ∈ Word (Vtx‘𝐺) ∣ (#‘𝑤) = 1}))
12 rabid 3145 . . . . . . 7 (𝑤 ∈ {𝑤 ∈ Word (Vtx‘𝐺) ∣ (#‘𝑤) = 1} ↔ (𝑤 ∈ Word (Vtx‘𝐺) ∧ (#‘𝑤) = 1))
1311, 12syl6bb 276 . . . . . 6 ((𝐺 ∈ USPGraph ∧ 𝑃𝑉) → (𝑤 ∈ (0 WWalksN 𝐺) ↔ (𝑤 ∈ Word (Vtx‘𝐺) ∧ (#‘𝑤) = 1)))
1413anbi1d 741 . . . . 5 ((𝐺 ∈ USPGraph ∧ 𝑃𝑉) → ((𝑤 ∈ (0 WWalksN 𝐺) ∧ (𝑤‘0) = 𝑃) ↔ ((𝑤 ∈ Word (Vtx‘𝐺) ∧ (#‘𝑤) = 1) ∧ (𝑤‘0) = 𝑃)))
1514abbidv 2770 . . . 4 ((𝐺 ∈ USPGraph ∧ 𝑃𝑉) → {𝑤 ∣ (𝑤 ∈ (0 WWalksN 𝐺) ∧ (𝑤‘0) = 𝑃)} = {𝑤 ∣ ((𝑤 ∈ Word (Vtx‘𝐺) ∧ (#‘𝑤) = 1) ∧ (𝑤‘0) = 𝑃)})
16 wrdl1s1 13431 . . . . . . . . 9 (𝑃 ∈ (Vtx‘𝐺) → (𝑣 = ⟨“𝑃”⟩ ↔ (𝑣 ∈ Word (Vtx‘𝐺) ∧ (#‘𝑣) = 1 ∧ (𝑣‘0) = 𝑃)))
17 df-3an 1056 . . . . . . . . 9 ((𝑣 ∈ Word (Vtx‘𝐺) ∧ (#‘𝑣) = 1 ∧ (𝑣‘0) = 𝑃) ↔ ((𝑣 ∈ Word (Vtx‘𝐺) ∧ (#‘𝑣) = 1) ∧ (𝑣‘0) = 𝑃))
1816, 17syl6rbb 277 . . . . . . . 8 (𝑃 ∈ (Vtx‘𝐺) → (((𝑣 ∈ Word (Vtx‘𝐺) ∧ (#‘𝑣) = 1) ∧ (𝑣‘0) = 𝑃) ↔ 𝑣 = ⟨“𝑃”⟩))
19 vex 3234 . . . . . . . . 9 𝑣 ∈ V
20 eleq1 2718 . . . . . . . . . . 11 (𝑤 = 𝑣 → (𝑤 ∈ Word (Vtx‘𝐺) ↔ 𝑣 ∈ Word (Vtx‘𝐺)))
21 fveq2 6229 . . . . . . . . . . . 12 (𝑤 = 𝑣 → (#‘𝑤) = (#‘𝑣))
2221eqeq1d 2653 . . . . . . . . . . 11 (𝑤 = 𝑣 → ((#‘𝑤) = 1 ↔ (#‘𝑣) = 1))
2320, 22anbi12d 747 . . . . . . . . . 10 (𝑤 = 𝑣 → ((𝑤 ∈ Word (Vtx‘𝐺) ∧ (#‘𝑤) = 1) ↔ (𝑣 ∈ Word (Vtx‘𝐺) ∧ (#‘𝑣) = 1)))
24 fveq1 6228 . . . . . . . . . . 11 (𝑤 = 𝑣 → (𝑤‘0) = (𝑣‘0))
2524eqeq1d 2653 . . . . . . . . . 10 (𝑤 = 𝑣 → ((𝑤‘0) = 𝑃 ↔ (𝑣‘0) = 𝑃))
2623, 25anbi12d 747 . . . . . . . . 9 (𝑤 = 𝑣 → (((𝑤 ∈ Word (Vtx‘𝐺) ∧ (#‘𝑤) = 1) ∧ (𝑤‘0) = 𝑃) ↔ ((𝑣 ∈ Word (Vtx‘𝐺) ∧ (#‘𝑣) = 1) ∧ (𝑣‘0) = 𝑃)))
2719, 26elab 3382 . . . . . . . 8 (𝑣 ∈ {𝑤 ∣ ((𝑤 ∈ Word (Vtx‘𝐺) ∧ (#‘𝑤) = 1) ∧ (𝑤‘0) = 𝑃)} ↔ ((𝑣 ∈ Word (Vtx‘𝐺) ∧ (#‘𝑣) = 1) ∧ (𝑣‘0) = 𝑃))
28 velsn 4226 . . . . . . . 8 (𝑣 ∈ {⟨“𝑃”⟩} ↔ 𝑣 = ⟨“𝑃”⟩)
2918, 27, 283bitr4g 303 . . . . . . 7 (𝑃 ∈ (Vtx‘𝐺) → (𝑣 ∈ {𝑤 ∣ ((𝑤 ∈ Word (Vtx‘𝐺) ∧ (#‘𝑤) = 1) ∧ (𝑤‘0) = 𝑃)} ↔ 𝑣 ∈ {⟨“𝑃”⟩}))
3029, 3eleq2s 2748 . . . . . 6 (𝑃𝑉 → (𝑣 ∈ {𝑤 ∣ ((𝑤 ∈ Word (Vtx‘𝐺) ∧ (#‘𝑤) = 1) ∧ (𝑤‘0) = 𝑃)} ↔ 𝑣 ∈ {⟨“𝑃”⟩}))
3130eqrdv 2649 . . . . 5 (𝑃𝑉 → {𝑤 ∣ ((𝑤 ∈ Word (Vtx‘𝐺) ∧ (#‘𝑤) = 1) ∧ (𝑤‘0) = 𝑃)} = {⟨“𝑃”⟩})
3231adantl 481 . . . 4 ((𝐺 ∈ USPGraph ∧ 𝑃𝑉) → {𝑤 ∣ ((𝑤 ∈ Word (Vtx‘𝐺) ∧ (#‘𝑤) = 1) ∧ (𝑤‘0) = 𝑃)} = {⟨“𝑃”⟩})
338, 15, 323eqtrd 2689 . . 3 ((𝐺 ∈ USPGraph ∧ 𝑃𝑉) → {𝑤 ∈ (0 WWalksN 𝐺) ∣ (𝑤‘0) = 𝑃} = {⟨“𝑃”⟩})
3433fveq2d 6233 . 2 ((𝐺 ∈ USPGraph ∧ 𝑃𝑉) → (#‘{𝑤 ∈ (0 WWalksN 𝐺) ∣ (𝑤‘0) = 𝑃}) = (#‘{⟨“𝑃”⟩}))
35 s1cl 13418 . . . 4 (𝑃𝑉 → ⟨“𝑃”⟩ ∈ Word 𝑉)
36 hashsng 13197 . . . 4 (⟨“𝑃”⟩ ∈ Word 𝑉 → (#‘{⟨“𝑃”⟩}) = 1)
3735, 36syl 17 . . 3 (𝑃𝑉 → (#‘{⟨“𝑃”⟩}) = 1)
3837adantl 481 . 2 ((𝐺 ∈ USPGraph ∧ 𝑃𝑉) → (#‘{⟨“𝑃”⟩}) = 1)
396, 34, 383eqtrd 2689 1 ((𝐺 ∈ USPGraph ∧ 𝑃𝑉) → (𝑃𝐿0) = 1)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 196  wa 383  w3a 1054   = wceq 1523  wcel 2030  {cab 2637  {crab 2945  {csn 4210  cfv 5926  (class class class)co 6690  cmpt2 6692  0cc0 9974  1c1 9975  0cn0 11330  #chash 13157  Word cword 13323  ⟨“cs1 13326  Vtxcvtx 25919  USPGraphcuspgr 26088   WWalksN cwwlksn 26774
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1762  ax-4 1777  ax-5 1879  ax-6 1945  ax-7 1981  ax-8 2032  ax-9 2039  ax-10 2059  ax-11 2074  ax-12 2087  ax-13 2282  ax-ext 2631  ax-rep 4804  ax-sep 4814  ax-nul 4822  ax-pow 4873  ax-pr 4936  ax-un 6991  ax-cnex 10030  ax-resscn 10031  ax-1cn 10032  ax-icn 10033  ax-addcl 10034  ax-addrcl 10035  ax-mulcl 10036  ax-mulrcl 10037  ax-mulcom 10038  ax-addass 10039  ax-mulass 10040  ax-distr 10041  ax-i2m1 10042  ax-1ne0 10043  ax-1rid 10044  ax-rnegex 10045  ax-rrecex 10046  ax-cnre 10047  ax-pre-lttri 10048  ax-pre-lttrn 10049  ax-pre-ltadd 10050  ax-pre-mulgt0 10051
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3or 1055  df-3an 1056  df-tru 1526  df-ex 1745  df-nf 1750  df-sb 1938  df-eu 2502  df-mo 2503  df-clab 2638  df-cleq 2644  df-clel 2647  df-nfc 2782  df-ne 2824  df-nel 2927  df-ral 2946  df-rex 2947  df-reu 2948  df-rab 2950  df-v 3233  df-sbc 3469  df-csb 3567  df-dif 3610  df-un 3612  df-in 3614  df-ss 3621  df-pss 3623  df-nul 3949  df-if 4120  df-pw 4193  df-sn 4211  df-pr 4213  df-tp 4215  df-op 4217  df-uni 4469  df-int 4508  df-iun 4554  df-br 4686  df-opab 4746  df-mpt 4763  df-tr 4786  df-id 5053  df-eprel 5058  df-po 5064  df-so 5065  df-fr 5102  df-we 5104  df-xp 5149  df-rel 5150  df-cnv 5151  df-co 5152  df-dm 5153  df-rn 5154  df-res 5155  df-ima 5156  df-pred 5718  df-ord 5764  df-on 5765  df-lim 5766  df-suc 5767  df-iota 5889  df-fun 5928  df-fn 5929  df-f 5930  df-f1 5931  df-fo 5932  df-f1o 5933  df-fv 5934  df-riota 6651  df-ov 6693  df-oprab 6694  df-mpt2 6695  df-om 7108  df-1st 7210  df-2nd 7211  df-wrecs 7452  df-recs 7513  df-rdg 7551  df-1o 7605  df-oadd 7609  df-er 7787  df-map 7901  df-pm 7902  df-en 7998  df-dom 7999  df-sdom 8000  df-fin 8001  df-card 8803  df-pnf 10114  df-mnf 10115  df-xr 10116  df-ltxr 10117  df-le 10118  df-sub 10306  df-neg 10307  df-nn 11059  df-n0 11331  df-xnn0 11402  df-z 11416  df-uz 11726  df-fz 12365  df-fzo 12505  df-hash 13158  df-word 13331  df-s1 13334  df-wwlks 26778  df-wwlksn 26779
This theorem is referenced by:  rusgrnumwwlk  26942
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