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Theorem clwwlks 41187
 Description: The set of closed walks (in an undirected graph) as words over the set of vertices. (Contributed by Alexander van der Vekens, 20-Mar-2018.) (Revised by AV, 24-Apr-2021.)
Hypotheses
Ref Expression
clwwlks.v 𝑉 = (Vtx‘𝐺)
clwwlks.e 𝐸 = (Edg‘𝐺)
Assertion
Ref Expression
clwwlks (ClWWalkS‘𝐺) = {𝑤 ∈ Word 𝑉 ∣ (𝑤 ≠ ∅ ∧ ∀𝑖 ∈ (0..^((#‘𝑤) − 1)){(𝑤𝑖), (𝑤‘(𝑖 + 1))} ∈ 𝐸 ∧ {( lastS ‘𝑤), (𝑤‘0)} ∈ 𝐸)}
Distinct variable groups:   𝑖,𝐺,𝑤   𝑤,𝑉
Allowed substitution hints:   𝐸(𝑤,𝑖)   𝑉(𝑖)

Proof of Theorem clwwlks
Dummy variable 𝑔 is distinct from all other variables.
StepHypRef Expression
1 df-clwwlks 41185 . . . 4 ClWWalkS = (𝑔 ∈ V ↦ {𝑤 ∈ Word (Vtx‘𝑔) ∣ (𝑤 ≠ ∅ ∧ ∀𝑖 ∈ (0..^((#‘𝑤) − 1)){(𝑤𝑖), (𝑤‘(𝑖 + 1))} ∈ (Edg‘𝑔) ∧ {( lastS ‘𝑤), (𝑤‘0)} ∈ (Edg‘𝑔))})
21a1i 11 . . 3 (𝐺 ∈ V → ClWWalkS = (𝑔 ∈ V ↦ {𝑤 ∈ Word (Vtx‘𝑔) ∣ (𝑤 ≠ ∅ ∧ ∀𝑖 ∈ (0..^((#‘𝑤) − 1)){(𝑤𝑖), (𝑤‘(𝑖 + 1))} ∈ (Edg‘𝑔) ∧ {( lastS ‘𝑤), (𝑤‘0)} ∈ (Edg‘𝑔))}))
3 fveq2 6103 . . . . . . 7 (𝑔 = 𝐺 → (Vtx‘𝑔) = (Vtx‘𝐺))
4 clwwlks.v . . . . . . 7 𝑉 = (Vtx‘𝐺)
53, 4syl6eqr 2662 . . . . . 6 (𝑔 = 𝐺 → (Vtx‘𝑔) = 𝑉)
6 wrdeq 13182 . . . . . 6 ((Vtx‘𝑔) = 𝑉 → Word (Vtx‘𝑔) = Word 𝑉)
75, 6syl 17 . . . . 5 (𝑔 = 𝐺 → Word (Vtx‘𝑔) = Word 𝑉)
8 fveq2 6103 . . . . . . . . 9 (𝑔 = 𝐺 → (Edg‘𝑔) = (Edg‘𝐺))
9 clwwlks.e . . . . . . . . 9 𝐸 = (Edg‘𝐺)
108, 9syl6eqr 2662 . . . . . . . 8 (𝑔 = 𝐺 → (Edg‘𝑔) = 𝐸)
1110eleq2d 2673 . . . . . . 7 (𝑔 = 𝐺 → ({(𝑤𝑖), (𝑤‘(𝑖 + 1))} ∈ (Edg‘𝑔) ↔ {(𝑤𝑖), (𝑤‘(𝑖 + 1))} ∈ 𝐸))
1211ralbidv 2969 . . . . . 6 (𝑔 = 𝐺 → (∀𝑖 ∈ (0..^((#‘𝑤) − 1)){(𝑤𝑖), (𝑤‘(𝑖 + 1))} ∈ (Edg‘𝑔) ↔ ∀𝑖 ∈ (0..^((#‘𝑤) − 1)){(𝑤𝑖), (𝑤‘(𝑖 + 1))} ∈ 𝐸))
1310eleq2d 2673 . . . . . 6 (𝑔 = 𝐺 → ({( lastS ‘𝑤), (𝑤‘0)} ∈ (Edg‘𝑔) ↔ {( lastS ‘𝑤), (𝑤‘0)} ∈ 𝐸))
1412, 133anbi23d 1394 . . . . 5 (𝑔 = 𝐺 → ((𝑤 ≠ ∅ ∧ ∀𝑖 ∈ (0..^((#‘𝑤) − 1)){(𝑤𝑖), (𝑤‘(𝑖 + 1))} ∈ (Edg‘𝑔) ∧ {( lastS ‘𝑤), (𝑤‘0)} ∈ (Edg‘𝑔)) ↔ (𝑤 ≠ ∅ ∧ ∀𝑖 ∈ (0..^((#‘𝑤) − 1)){(𝑤𝑖), (𝑤‘(𝑖 + 1))} ∈ 𝐸 ∧ {( lastS ‘𝑤), (𝑤‘0)} ∈ 𝐸)))
157, 14rabeqbidv 3168 . . . 4 (𝑔 = 𝐺 → {𝑤 ∈ Word (Vtx‘𝑔) ∣ (𝑤 ≠ ∅ ∧ ∀𝑖 ∈ (0..^((#‘𝑤) − 1)){(𝑤𝑖), (𝑤‘(𝑖 + 1))} ∈ (Edg‘𝑔) ∧ {( lastS ‘𝑤), (𝑤‘0)} ∈ (Edg‘𝑔))} = {𝑤 ∈ Word 𝑉 ∣ (𝑤 ≠ ∅ ∧ ∀𝑖 ∈ (0..^((#‘𝑤) − 1)){(𝑤𝑖), (𝑤‘(𝑖 + 1))} ∈ 𝐸 ∧ {( lastS ‘𝑤), (𝑤‘0)} ∈ 𝐸)})
1615adantl 481 . . 3 ((𝐺 ∈ V ∧ 𝑔 = 𝐺) → {𝑤 ∈ Word (Vtx‘𝑔) ∣ (𝑤 ≠ ∅ ∧ ∀𝑖 ∈ (0..^((#‘𝑤) − 1)){(𝑤𝑖), (𝑤‘(𝑖 + 1))} ∈ (Edg‘𝑔) ∧ {( lastS ‘𝑤), (𝑤‘0)} ∈ (Edg‘𝑔))} = {𝑤 ∈ Word 𝑉 ∣ (𝑤 ≠ ∅ ∧ ∀𝑖 ∈ (0..^((#‘𝑤) − 1)){(𝑤𝑖), (𝑤‘(𝑖 + 1))} ∈ 𝐸 ∧ {( lastS ‘𝑤), (𝑤‘0)} ∈ 𝐸)})
17 id 22 . . 3 (𝐺 ∈ V → 𝐺 ∈ V)
18 fvex 6113 . . . . . 6 (Vtx‘𝐺) ∈ V
194, 18eqeltri 2684 . . . . 5 𝑉 ∈ V
2019a1i 11 . . . 4 (𝐺 ∈ V → 𝑉 ∈ V)
21 wrdexg 13170 . . . 4 (𝑉 ∈ V → Word 𝑉 ∈ V)
22 rabexg 4739 . . . 4 (Word 𝑉 ∈ V → {𝑤 ∈ Word 𝑉 ∣ (𝑤 ≠ ∅ ∧ ∀𝑖 ∈ (0..^((#‘𝑤) − 1)){(𝑤𝑖), (𝑤‘(𝑖 + 1))} ∈ 𝐸 ∧ {( lastS ‘𝑤), (𝑤‘0)} ∈ 𝐸)} ∈ V)
2320, 21, 223syl 18 . . 3 (𝐺 ∈ V → {𝑤 ∈ Word 𝑉 ∣ (𝑤 ≠ ∅ ∧ ∀𝑖 ∈ (0..^((#‘𝑤) − 1)){(𝑤𝑖), (𝑤‘(𝑖 + 1))} ∈ 𝐸 ∧ {( lastS ‘𝑤), (𝑤‘0)} ∈ 𝐸)} ∈ V)
242, 16, 17, 23fvmptd 6197 . 2 (𝐺 ∈ V → (ClWWalkS‘𝐺) = {𝑤 ∈ Word 𝑉 ∣ (𝑤 ≠ ∅ ∧ ∀𝑖 ∈ (0..^((#‘𝑤) − 1)){(𝑤𝑖), (𝑤‘(𝑖 + 1))} ∈ 𝐸 ∧ {( lastS ‘𝑤), (𝑤‘0)} ∈ 𝐸)})
25 fvprc 6097 . . 3 𝐺 ∈ V → (ClWWalkS‘𝐺) = ∅)
26 noel 3878 . . . . . . . 8 ¬ {( lastS ‘𝑤), (𝑤‘0)} ∈ ∅
27 fvprc 6097 . . . . . . . . . 10 𝐺 ∈ V → (Edg‘𝐺) = ∅)
289, 27syl5eq 2656 . . . . . . . . 9 𝐺 ∈ V → 𝐸 = ∅)
2928eleq2d 2673 . . . . . . . 8 𝐺 ∈ V → ({( lastS ‘𝑤), (𝑤‘0)} ∈ 𝐸 ↔ {( lastS ‘𝑤), (𝑤‘0)} ∈ ∅))
3026, 29mtbiri 316 . . . . . . 7 𝐺 ∈ V → ¬ {( lastS ‘𝑤), (𝑤‘0)} ∈ 𝐸)
3130adantr 480 . . . . . 6 ((¬ 𝐺 ∈ V ∧ 𝑤 ∈ Word 𝑉) → ¬ {( lastS ‘𝑤), (𝑤‘0)} ∈ 𝐸)
3231intn3an3d 1436 . . . . 5 ((¬ 𝐺 ∈ V ∧ 𝑤 ∈ Word 𝑉) → ¬ (𝑤 ≠ ∅ ∧ ∀𝑖 ∈ (0..^((#‘𝑤) − 1)){(𝑤𝑖), (𝑤‘(𝑖 + 1))} ∈ 𝐸 ∧ {( lastS ‘𝑤), (𝑤‘0)} ∈ 𝐸))
3332ralrimiva 2949 . . . 4 𝐺 ∈ V → ∀𝑤 ∈ Word 𝑉 ¬ (𝑤 ≠ ∅ ∧ ∀𝑖 ∈ (0..^((#‘𝑤) − 1)){(𝑤𝑖), (𝑤‘(𝑖 + 1))} ∈ 𝐸 ∧ {( lastS ‘𝑤), (𝑤‘0)} ∈ 𝐸))
34 rabeq0 3911 . . . 4 ({𝑤 ∈ Word 𝑉 ∣ (𝑤 ≠ ∅ ∧ ∀𝑖 ∈ (0..^((#‘𝑤) − 1)){(𝑤𝑖), (𝑤‘(𝑖 + 1))} ∈ 𝐸 ∧ {( lastS ‘𝑤), (𝑤‘0)} ∈ 𝐸)} = ∅ ↔ ∀𝑤 ∈ Word 𝑉 ¬ (𝑤 ≠ ∅ ∧ ∀𝑖 ∈ (0..^((#‘𝑤) − 1)){(𝑤𝑖), (𝑤‘(𝑖 + 1))} ∈ 𝐸 ∧ {( lastS ‘𝑤), (𝑤‘0)} ∈ 𝐸))
3533, 34sylibr 223 . . 3 𝐺 ∈ V → {𝑤 ∈ Word 𝑉 ∣ (𝑤 ≠ ∅ ∧ ∀𝑖 ∈ (0..^((#‘𝑤) − 1)){(𝑤𝑖), (𝑤‘(𝑖 + 1))} ∈ 𝐸 ∧ {( lastS ‘𝑤), (𝑤‘0)} ∈ 𝐸)} = ∅)
3625, 35eqtr4d 2647 . 2 𝐺 ∈ V → (ClWWalkS‘𝐺) = {𝑤 ∈ Word 𝑉 ∣ (𝑤 ≠ ∅ ∧ ∀𝑖 ∈ (0..^((#‘𝑤) − 1)){(𝑤𝑖), (𝑤‘(𝑖 + 1))} ∈ 𝐸 ∧ {( lastS ‘𝑤), (𝑤‘0)} ∈ 𝐸)})
3724, 36pm2.61i 175 1 (ClWWalkS‘𝐺) = {𝑤 ∈ Word 𝑉 ∣ (𝑤 ≠ ∅ ∧ ∀𝑖 ∈ (0..^((#‘𝑤) − 1)){(𝑤𝑖), (𝑤‘(𝑖 + 1))} ∈ 𝐸 ∧ {( lastS ‘𝑤), (𝑤‘0)} ∈ 𝐸)}
 Colors of variables: wff setvar class Syntax hints:  ¬ wn 3   ∧ wa 383   ∧ w3a 1031   = wceq 1475   ∈ wcel 1977   ≠ wne 2780  ∀wral 2896  {crab 2900  Vcvv 3173  ∅c0 3874  {cpr 4127   ↦ cmpt 4643  ‘cfv 5804  (class class class)co 6549  0cc0 9815  1c1 9816   + caddc 9818   − cmin 10145  ..^cfzo 12334  #chash 12979  Word cword 13146   lastS clsw 13147  Vtxcvtx 25673  Edgcedga 25792  ClWWalkScclwwlks 41183 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-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-clwwlks 41185 This theorem is referenced by:  isclwwlks  41188  clwwlkssswrd  41218
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