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Theorem 01wlk 41284
 Description: A pair of an empty set (of edges) and a second set (of vertices) is a walk iff the second set contains exactly one vertex. (Contributed by Alexander van der Vekens, 30-Oct-2017.) (Revised by AV, 3-Jan-2021.)
Hypothesis
Ref Expression
01wlk.v 𝑉 = (Vtx‘𝐺)
Assertion
Ref Expression
01wlk ((𝐺𝑈𝑃𝑍) → (∅(1Walks‘𝐺)𝑃𝑃:(0...0)⟶𝑉))

Proof of Theorem 01wlk
Dummy variable 𝑘 is distinct from all other variables.
StepHypRef Expression
1 0ex 4718 . . 3 ∅ ∈ V
2 01wlk.v . . . 4 𝑉 = (Vtx‘𝐺)
3 eqid 2610 . . . 4 (iEdg‘𝐺) = (iEdg‘𝐺)
42, 3is1wlk 40813 . . 3 ((𝐺𝑈 ∧ ∅ ∈ V ∧ 𝑃𝑍) → (∅(1Walks‘𝐺)𝑃 ↔ (∅ ∈ Word dom (iEdg‘𝐺) ∧ 𝑃:(0...(#‘∅))⟶𝑉 ∧ ∀𝑘 ∈ (0..^(#‘∅))if-((𝑃𝑘) = (𝑃‘(𝑘 + 1)), ((iEdg‘𝐺)‘(∅‘𝑘)) = {(𝑃𝑘)}, {(𝑃𝑘), (𝑃‘(𝑘 + 1))} ⊆ ((iEdg‘𝐺)‘(∅‘𝑘))))))
51, 4mp3an2 1404 . 2 ((𝐺𝑈𝑃𝑍) → (∅(1Walks‘𝐺)𝑃 ↔ (∅ ∈ Word dom (iEdg‘𝐺) ∧ 𝑃:(0...(#‘∅))⟶𝑉 ∧ ∀𝑘 ∈ (0..^(#‘∅))if-((𝑃𝑘) = (𝑃‘(𝑘 + 1)), ((iEdg‘𝐺)‘(∅‘𝑘)) = {(𝑃𝑘)}, {(𝑃𝑘), (𝑃‘(𝑘 + 1))} ⊆ ((iEdg‘𝐺)‘(∅‘𝑘))))))
6 ral0 4028 . . . . 5 𝑘 ∈ ∅ if-((𝑃𝑘) = (𝑃‘(𝑘 + 1)), ((iEdg‘𝐺)‘(∅‘𝑘)) = {(𝑃𝑘)}, {(𝑃𝑘), (𝑃‘(𝑘 + 1))} ⊆ ((iEdg‘𝐺)‘(∅‘𝑘)))
7 hash0 13019 . . . . . . . 8 (#‘∅) = 0
87oveq2i 6560 . . . . . . 7 (0..^(#‘∅)) = (0..^0)
9 fzo0 12361 . . . . . . 7 (0..^0) = ∅
108, 9eqtri 2632 . . . . . 6 (0..^(#‘∅)) = ∅
1110raleqi 3119 . . . . 5 (∀𝑘 ∈ (0..^(#‘∅))if-((𝑃𝑘) = (𝑃‘(𝑘 + 1)), ((iEdg‘𝐺)‘(∅‘𝑘)) = {(𝑃𝑘)}, {(𝑃𝑘), (𝑃‘(𝑘 + 1))} ⊆ ((iEdg‘𝐺)‘(∅‘𝑘))) ↔ ∀𝑘 ∈ ∅ if-((𝑃𝑘) = (𝑃‘(𝑘 + 1)), ((iEdg‘𝐺)‘(∅‘𝑘)) = {(𝑃𝑘)}, {(𝑃𝑘), (𝑃‘(𝑘 + 1))} ⊆ ((iEdg‘𝐺)‘(∅‘𝑘))))
126, 11mpbir 220 . . . 4 𝑘 ∈ (0..^(#‘∅))if-((𝑃𝑘) = (𝑃‘(𝑘 + 1)), ((iEdg‘𝐺)‘(∅‘𝑘)) = {(𝑃𝑘)}, {(𝑃𝑘), (𝑃‘(𝑘 + 1))} ⊆ ((iEdg‘𝐺)‘(∅‘𝑘)))
1312biantru 525 . . 3 ((∅ ∈ Word dom (iEdg‘𝐺) ∧ 𝑃:(0...(#‘∅))⟶𝑉) ↔ ((∅ ∈ Word dom (iEdg‘𝐺) ∧ 𝑃:(0...(#‘∅))⟶𝑉) ∧ ∀𝑘 ∈ (0..^(#‘∅))if-((𝑃𝑘) = (𝑃‘(𝑘 + 1)), ((iEdg‘𝐺)‘(∅‘𝑘)) = {(𝑃𝑘)}, {(𝑃𝑘), (𝑃‘(𝑘 + 1))} ⊆ ((iEdg‘𝐺)‘(∅‘𝑘)))))
147eqcomi 2619 . . . . . 6 0 = (#‘∅)
1514oveq2i 6560 . . . . 5 (0...0) = (0...(#‘∅))
1615feq2i 5950 . . . 4 (𝑃:(0...0)⟶𝑉𝑃:(0...(#‘∅))⟶𝑉)
17 wrd0 13185 . . . . 5 ∅ ∈ Word dom (iEdg‘𝐺)
1817biantrur 526 . . . 4 (𝑃:(0...(#‘∅))⟶𝑉 ↔ (∅ ∈ Word dom (iEdg‘𝐺) ∧ 𝑃:(0...(#‘∅))⟶𝑉))
1916, 18bitri 263 . . 3 (𝑃:(0...0)⟶𝑉 ↔ (∅ ∈ Word dom (iEdg‘𝐺) ∧ 𝑃:(0...(#‘∅))⟶𝑉))
20 df-3an 1033 . . 3 ((∅ ∈ Word dom (iEdg‘𝐺) ∧ 𝑃:(0...(#‘∅))⟶𝑉 ∧ ∀𝑘 ∈ (0..^(#‘∅))if-((𝑃𝑘) = (𝑃‘(𝑘 + 1)), ((iEdg‘𝐺)‘(∅‘𝑘)) = {(𝑃𝑘)}, {(𝑃𝑘), (𝑃‘(𝑘 + 1))} ⊆ ((iEdg‘𝐺)‘(∅‘𝑘)))) ↔ ((∅ ∈ Word dom (iEdg‘𝐺) ∧ 𝑃:(0...(#‘∅))⟶𝑉) ∧ ∀𝑘 ∈ (0..^(#‘∅))if-((𝑃𝑘) = (𝑃‘(𝑘 + 1)), ((iEdg‘𝐺)‘(∅‘𝑘)) = {(𝑃𝑘)}, {(𝑃𝑘), (𝑃‘(𝑘 + 1))} ⊆ ((iEdg‘𝐺)‘(∅‘𝑘)))))
2113, 19, 203bitr4ri 292 . 2 ((∅ ∈ Word dom (iEdg‘𝐺) ∧ 𝑃:(0...(#‘∅))⟶𝑉 ∧ ∀𝑘 ∈ (0..^(#‘∅))if-((𝑃𝑘) = (𝑃‘(𝑘 + 1)), ((iEdg‘𝐺)‘(∅‘𝑘)) = {(𝑃𝑘)}, {(𝑃𝑘), (𝑃‘(𝑘 + 1))} ⊆ ((iEdg‘𝐺)‘(∅‘𝑘)))) ↔ 𝑃:(0...0)⟶𝑉)
225, 21syl6bb 275 1 ((𝐺𝑈𝑃𝑍) → (∅(1Walks‘𝐺)𝑃𝑃:(0...0)⟶𝑉))
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ↔ wb 195   ∧ wa 383  if-wif 1006   ∧ w3a 1031   = wceq 1475   ∈ wcel 1977  ∀wral 2896  Vcvv 3173   ⊆ wss 3540  ∅c0 3874  {csn 4125  {cpr 4127   class class class wbr 4583  dom cdm 5038  ⟶wf 5800  ‘cfv 5804  (class class class)co 6549  0cc0 9815  1c1 9816   + caddc 9818  ...cfz 12197  ..^cfzo 12334  #chash 12979  Word cword 13146  Vtxcvtx 25673  iEdgciedg 25674  1Walksc1wlks 40796 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-rep 4699  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847  ax-cnex 9871  ax-resscn 9872  ax-1cn 9873  ax-icn 9874  ax-addcl 9875  ax-addrcl 9876  ax-mulcl 9877  ax-mulrcl 9878  ax-mulcom 9879  ax-addass 9880  ax-mulass 9881  ax-distr 9882  ax-i2m1 9883  ax-1ne0 9884  ax-1rid 9885  ax-rnegex 9886  ax-rrecex 9887  ax-cnre 9888  ax-pre-lttri 9889  ax-pre-lttrn 9890  ax-pre-ltadd 9891  ax-pre-mulgt0 9892 This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-ifp 1007  df-3or 1032  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-nel 2783  df-ral 2901  df-rex 2902  df-reu 2903  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-pss 3556  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-tp 4130  df-op 4132  df-uni 4373  df-int 4411  df-iun 4457  df-br 4584  df-opab 4644  df-mpt 4645  df-tr 4681  df-eprel 4949  df-id 4953  df-po 4959  df-so 4960  df-fr 4997  df-we 4999  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-pred 5597  df-ord 5643  df-on 5644  df-lim 5645  df-suc 5646  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-f1 5809  df-fo 5810  df-f1o 5811  df-fv 5812  df-riota 6511  df-ov 6552  df-oprab 6553  df-mpt2 6554  df-om 6958  df-1st 7059  df-2nd 7060  df-wrecs 7294  df-recs 7355  df-rdg 7393  df-1o 7447  df-er 7629  df-map 7746  df-pm 7747  df-en 7842  df-dom 7843  df-sdom 7844  df-fin 7845  df-card 8648  df-pnf 9955  df-mnf 9956  df-xr 9957  df-ltxr 9958  df-le 9959  df-sub 10147  df-neg 10148  df-nn 10898  df-n0 11170  df-z 11255  df-uz 11564  df-fz 12198  df-fzo 12335  df-hash 12980  df-word 13154  df-1wlks 40800 This theorem is referenced by:  is01wlk  41285  0wlkOn  41288  0Trl  41290  0clWlk  41298
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