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Theorem wlkres 26567
Description: The restriction 𝐻, 𝑄 of a walk 𝐹, 𝑃 to an initial segment of the walk (of length 𝑁) forms a walk on the subgraph 𝑆 consisting of the edges in the initial segment. Formerly proven directly for Eulerian paths, see eupthres 27075. (Contributed by Mario Carneiro, 12-Mar-2015.) (Revised by Mario Carneiro, 3-May-2015.) (Revised by AV, 5-Mar-2021.)
Hypotheses
Ref Expression
wlkres.v 𝑉 = (Vtx‘𝐺)
wlkres.i 𝐼 = (iEdg‘𝐺)
wlkres.d (𝜑𝐹(Walks‘𝐺)𝑃)
wlkres.n (𝜑𝑁 ∈ (0..^(#‘𝐹)))
wlkres.s (𝜑 → (Vtx‘𝑆) = 𝑉)
wlkres.e (𝜑 → (iEdg‘𝑆) = (𝐼 ↾ (𝐹 “ (0..^𝑁))))
wlkres.h 𝐻 = (𝐹 ↾ (0..^𝑁))
wlkres.q 𝑄 = (𝑃 ↾ (0...𝑁))
Assertion
Ref Expression
wlkres (𝜑𝐻(Walks‘𝑆)𝑄)

Proof of Theorem wlkres
Dummy variables 𝑘 𝑖 𝑥 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 wlkres.h . . 3 𝐻 = (𝐹 ↾ (0..^𝑁))
2 wlkres.d . . . . . . . 8 (𝜑𝐹(Walks‘𝐺)𝑃)
3 wlkres.i . . . . . . . . 9 𝐼 = (iEdg‘𝐺)
43wlkf 26510 . . . . . . . 8 (𝐹(Walks‘𝐺)𝑃𝐹 ∈ Word dom 𝐼)
5 wrdfn 13319 . . . . . . . 8 (𝐹 ∈ Word dom 𝐼𝐹 Fn (0..^(#‘𝐹)))
62, 4, 53syl 18 . . . . . . 7 (𝜑𝐹 Fn (0..^(#‘𝐹)))
7 wlkres.n . . . . . . . 8 (𝜑𝑁 ∈ (0..^(#‘𝐹)))
8 elfzouz2 12484 . . . . . . . 8 (𝑁 ∈ (0..^(#‘𝐹)) → (#‘𝐹) ∈ (ℤ𝑁))
9 fzoss2 12496 . . . . . . . 8 ((#‘𝐹) ∈ (ℤ𝑁) → (0..^𝑁) ⊆ (0..^(#‘𝐹)))
107, 8, 93syl 18 . . . . . . 7 (𝜑 → (0..^𝑁) ⊆ (0..^(#‘𝐹)))
11 fnssres 6004 . . . . . . 7 ((𝐹 Fn (0..^(#‘𝐹)) ∧ (0..^𝑁) ⊆ (0..^(#‘𝐹))) → (𝐹 ↾ (0..^𝑁)) Fn (0..^𝑁))
126, 10, 11syl2anc 693 . . . . . 6 (𝜑 → (𝐹 ↾ (0..^𝑁)) Fn (0..^𝑁))
13 simpr 477 . . . . . . . . . . . 12 ((𝜑𝑥 ∈ (0..^𝑁)) → 𝑥 ∈ (0..^𝑁))
14 fveq2 6191 . . . . . . . . . . . . . 14 (𝑖 = 𝑥 → (𝐹𝑖) = (𝐹𝑥))
1514eqeq1d 2624 . . . . . . . . . . . . 13 (𝑖 = 𝑥 → ((𝐹𝑖) = ((𝐹 ↾ (0..^𝑁))‘𝑥) ↔ (𝐹𝑥) = ((𝐹 ↾ (0..^𝑁))‘𝑥)))
1615adantl 482 . . . . . . . . . . . 12 (((𝜑𝑥 ∈ (0..^𝑁)) ∧ 𝑖 = 𝑥) → ((𝐹𝑖) = ((𝐹 ↾ (0..^𝑁))‘𝑥) ↔ (𝐹𝑥) = ((𝐹 ↾ (0..^𝑁))‘𝑥)))
17 fvres 6207 . . . . . . . . . . . . . 14 (𝑥 ∈ (0..^𝑁) → ((𝐹 ↾ (0..^𝑁))‘𝑥) = (𝐹𝑥))
1817adantl 482 . . . . . . . . . . . . 13 ((𝜑𝑥 ∈ (0..^𝑁)) → ((𝐹 ↾ (0..^𝑁))‘𝑥) = (𝐹𝑥))
1918eqcomd 2628 . . . . . . . . . . . 12 ((𝜑𝑥 ∈ (0..^𝑁)) → (𝐹𝑥) = ((𝐹 ↾ (0..^𝑁))‘𝑥))
2013, 16, 19rspcedvd 3317 . . . . . . . . . . 11 ((𝜑𝑥 ∈ (0..^𝑁)) → ∃𝑖 ∈ (0..^𝑁)(𝐹𝑖) = ((𝐹 ↾ (0..^𝑁))‘𝑥))
216adantr 481 . . . . . . . . . . . 12 ((𝜑𝑥 ∈ (0..^𝑁)) → 𝐹 Fn (0..^(#‘𝐹)))
2210adantr 481 . . . . . . . . . . . 12 ((𝜑𝑥 ∈ (0..^𝑁)) → (0..^𝑁) ⊆ (0..^(#‘𝐹)))
2321, 22fvelimabd 6254 . . . . . . . . . . 11 ((𝜑𝑥 ∈ (0..^𝑁)) → (((𝐹 ↾ (0..^𝑁))‘𝑥) ∈ (𝐹 “ (0..^𝑁)) ↔ ∃𝑖 ∈ (0..^𝑁)(𝐹𝑖) = ((𝐹 ↾ (0..^𝑁))‘𝑥)))
2420, 23mpbird 247 . . . . . . . . . 10 ((𝜑𝑥 ∈ (0..^𝑁)) → ((𝐹 ↾ (0..^𝑁))‘𝑥) ∈ (𝐹 “ (0..^𝑁)))
252, 4syl 17 . . . . . . . . . . . . 13 (𝜑𝐹 ∈ Word dom 𝐼)
26 wrdf 13310 . . . . . . . . . . . . . 14 (𝐹 ∈ Word dom 𝐼𝐹:(0..^(#‘𝐹))⟶dom 𝐼)
27 ffvelrn 6357 . . . . . . . . . . . . . . . . 17 ((𝐹:(0..^(#‘𝐹))⟶dom 𝐼𝑥 ∈ (0..^(#‘𝐹))) → (𝐹𝑥) ∈ dom 𝐼)
2827expcom 451 . . . . . . . . . . . . . . . 16 (𝑥 ∈ (0..^(#‘𝐹)) → (𝐹:(0..^(#‘𝐹))⟶dom 𝐼 → (𝐹𝑥) ∈ dom 𝐼))
2910sselda 3603 . . . . . . . . . . . . . . . 16 ((𝜑𝑥 ∈ (0..^𝑁)) → 𝑥 ∈ (0..^(#‘𝐹)))
3028, 29syl11 33 . . . . . . . . . . . . . . 15 (𝐹:(0..^(#‘𝐹))⟶dom 𝐼 → ((𝜑𝑥 ∈ (0..^𝑁)) → (𝐹𝑥) ∈ dom 𝐼))
3130expd 452 . . . . . . . . . . . . . 14 (𝐹:(0..^(#‘𝐹))⟶dom 𝐼 → (𝜑 → (𝑥 ∈ (0..^𝑁) → (𝐹𝑥) ∈ dom 𝐼)))
3226, 31syl 17 . . . . . . . . . . . . 13 (𝐹 ∈ Word dom 𝐼 → (𝜑 → (𝑥 ∈ (0..^𝑁) → (𝐹𝑥) ∈ dom 𝐼)))
3325, 32mpcom 38 . . . . . . . . . . . 12 (𝜑 → (𝑥 ∈ (0..^𝑁) → (𝐹𝑥) ∈ dom 𝐼))
3433imp 445 . . . . . . . . . . 11 ((𝜑𝑥 ∈ (0..^𝑁)) → (𝐹𝑥) ∈ dom 𝐼)
3518, 34eqeltrd 2701 . . . . . . . . . 10 ((𝜑𝑥 ∈ (0..^𝑁)) → ((𝐹 ↾ (0..^𝑁))‘𝑥) ∈ dom 𝐼)
3624, 35elind 3798 . . . . . . . . 9 ((𝜑𝑥 ∈ (0..^𝑁)) → ((𝐹 ↾ (0..^𝑁))‘𝑥) ∈ ((𝐹 “ (0..^𝑁)) ∩ dom 𝐼))
37 dmres 5419 . . . . . . . . 9 dom (𝐼 ↾ (𝐹 “ (0..^𝑁))) = ((𝐹 “ (0..^𝑁)) ∩ dom 𝐼)
3836, 37syl6eleqr 2712 . . . . . . . 8 ((𝜑𝑥 ∈ (0..^𝑁)) → ((𝐹 ↾ (0..^𝑁))‘𝑥) ∈ dom (𝐼 ↾ (𝐹 “ (0..^𝑁))))
39 wlkres.e . . . . . . . . . . 11 (𝜑 → (iEdg‘𝑆) = (𝐼 ↾ (𝐹 “ (0..^𝑁))))
4039dmeqd 5326 . . . . . . . . . 10 (𝜑 → dom (iEdg‘𝑆) = dom (𝐼 ↾ (𝐹 “ (0..^𝑁))))
4140eleq2d 2687 . . . . . . . . 9 (𝜑 → (((𝐹 ↾ (0..^𝑁))‘𝑥) ∈ dom (iEdg‘𝑆) ↔ ((𝐹 ↾ (0..^𝑁))‘𝑥) ∈ dom (𝐼 ↾ (𝐹 “ (0..^𝑁)))))
4241adantr 481 . . . . . . . 8 ((𝜑𝑥 ∈ (0..^𝑁)) → (((𝐹 ↾ (0..^𝑁))‘𝑥) ∈ dom (iEdg‘𝑆) ↔ ((𝐹 ↾ (0..^𝑁))‘𝑥) ∈ dom (𝐼 ↾ (𝐹 “ (0..^𝑁)))))
4338, 42mpbird 247 . . . . . . 7 ((𝜑𝑥 ∈ (0..^𝑁)) → ((𝐹 ↾ (0..^𝑁))‘𝑥) ∈ dom (iEdg‘𝑆))
4443ralrimiva 2966 . . . . . 6 (𝜑 → ∀𝑥 ∈ (0..^𝑁)((𝐹 ↾ (0..^𝑁))‘𝑥) ∈ dom (iEdg‘𝑆))
45 ffnfv 6388 . . . . . 6 ((𝐹 ↾ (0..^𝑁)):(0..^𝑁)⟶dom (iEdg‘𝑆) ↔ ((𝐹 ↾ (0..^𝑁)) Fn (0..^𝑁) ∧ ∀𝑥 ∈ (0..^𝑁)((𝐹 ↾ (0..^𝑁))‘𝑥) ∈ dom (iEdg‘𝑆)))
4612, 44, 45sylanbrc 698 . . . . 5 (𝜑 → (𝐹 ↾ (0..^𝑁)):(0..^𝑁)⟶dom (iEdg‘𝑆))
47 fzossfz 12488 . . . . . . . . 9 (0..^(#‘𝐹)) ⊆ (0...(#‘𝐹))
4847, 7sseldi 3601 . . . . . . . 8 (𝜑𝑁 ∈ (0...(#‘𝐹)))
49 wlkreslem0 26565 . . . . . . . 8 ((𝐹 ∈ Word dom 𝐼𝑁 ∈ (0...(#‘𝐹))) → (#‘(𝐹 ↾ (0..^𝑁))) = 𝑁)
5025, 48, 49syl2anc 693 . . . . . . 7 (𝜑 → (#‘(𝐹 ↾ (0..^𝑁))) = 𝑁)
5150oveq2d 6666 . . . . . 6 (𝜑 → (0..^(#‘(𝐹 ↾ (0..^𝑁)))) = (0..^𝑁))
5251feq2d 6031 . . . . 5 (𝜑 → ((𝐹 ↾ (0..^𝑁)):(0..^(#‘(𝐹 ↾ (0..^𝑁))))⟶dom (iEdg‘𝑆) ↔ (𝐹 ↾ (0..^𝑁)):(0..^𝑁)⟶dom (iEdg‘𝑆)))
5346, 52mpbird 247 . . . 4 (𝜑 → (𝐹 ↾ (0..^𝑁)):(0..^(#‘(𝐹 ↾ (0..^𝑁))))⟶dom (iEdg‘𝑆))
54 iswrdb 13311 . . . 4 ((𝐹 ↾ (0..^𝑁)) ∈ Word dom (iEdg‘𝑆) ↔ (𝐹 ↾ (0..^𝑁)):(0..^(#‘(𝐹 ↾ (0..^𝑁))))⟶dom (iEdg‘𝑆))
5553, 54sylibr 224 . . 3 (𝜑 → (𝐹 ↾ (0..^𝑁)) ∈ Word dom (iEdg‘𝑆))
561, 55syl5eqel 2705 . 2 (𝜑𝐻 ∈ Word dom (iEdg‘𝑆))
57 wlkres.v . . . . . . . 8 𝑉 = (Vtx‘𝐺)
5857wlkp 26512 . . . . . . 7 (𝐹(Walks‘𝐺)𝑃𝑃:(0...(#‘𝐹))⟶𝑉)
592, 58syl 17 . . . . . 6 (𝜑𝑃:(0...(#‘𝐹))⟶𝑉)
60 wlkres.s . . . . . . 7 (𝜑 → (Vtx‘𝑆) = 𝑉)
6160feq3d 6032 . . . . . 6 (𝜑 → (𝑃:(0...(#‘𝐹))⟶(Vtx‘𝑆) ↔ 𝑃:(0...(#‘𝐹))⟶𝑉))
6259, 61mpbird 247 . . . . 5 (𝜑𝑃:(0...(#‘𝐹))⟶(Vtx‘𝑆))
63 elfzuz3 12339 . . . . . 6 (𝑁 ∈ (0...(#‘𝐹)) → (#‘𝐹) ∈ (ℤ𝑁))
64 fzss2 12381 . . . . . 6 ((#‘𝐹) ∈ (ℤ𝑁) → (0...𝑁) ⊆ (0...(#‘𝐹)))
6548, 63, 643syl 18 . . . . 5 (𝜑 → (0...𝑁) ⊆ (0...(#‘𝐹)))
6662, 65fssresd 6071 . . . 4 (𝜑 → (𝑃 ↾ (0...𝑁)):(0...𝑁)⟶(Vtx‘𝑆))
671fveq2i 6194 . . . . . . 7 (#‘𝐻) = (#‘(𝐹 ↾ (0..^𝑁)))
6867, 50syl5eq 2668 . . . . . 6 (𝜑 → (#‘𝐻) = 𝑁)
6968oveq2d 6666 . . . . 5 (𝜑 → (0...(#‘𝐻)) = (0...𝑁))
7069feq2d 6031 . . . 4 (𝜑 → ((𝑃 ↾ (0...𝑁)):(0...(#‘𝐻))⟶(Vtx‘𝑆) ↔ (𝑃 ↾ (0...𝑁)):(0...𝑁)⟶(Vtx‘𝑆)))
7166, 70mpbird 247 . . 3 (𝜑 → (𝑃 ↾ (0...𝑁)):(0...(#‘𝐻))⟶(Vtx‘𝑆))
72 wlkres.q . . . 4 𝑄 = (𝑃 ↾ (0...𝑁))
7372feq1i 6036 . . 3 (𝑄:(0...(#‘𝐻))⟶(Vtx‘𝑆) ↔ (𝑃 ↾ (0...𝑁)):(0...(#‘𝐻))⟶(Vtx‘𝑆))
7471, 73sylibr 224 . 2 (𝜑𝑄:(0...(#‘𝐻))⟶(Vtx‘𝑆))
75 wlkv 26508 . . . . . . 7 (𝐹(Walks‘𝐺)𝑃 → (𝐺 ∈ V ∧ 𝐹 ∈ V ∧ 𝑃 ∈ V))
7657, 3iswlk 26506 . . . . . . . 8 ((𝐺 ∈ V ∧ 𝐹 ∈ V ∧ 𝑃 ∈ V) → (𝐹(Walks‘𝐺)𝑃 ↔ (𝐹 ∈ Word dom 𝐼𝑃:(0...(#‘𝐹))⟶𝑉 ∧ ∀𝑘 ∈ (0..^(#‘𝐹))if-((𝑃𝑘) = (𝑃‘(𝑘 + 1)), (𝐼‘(𝐹𝑘)) = {(𝑃𝑘)}, {(𝑃𝑘), (𝑃‘(𝑘 + 1))} ⊆ (𝐼‘(𝐹𝑘))))))
7776biimpd 219 . . . . . . 7 ((𝐺 ∈ V ∧ 𝐹 ∈ V ∧ 𝑃 ∈ V) → (𝐹(Walks‘𝐺)𝑃 → (𝐹 ∈ Word dom 𝐼𝑃:(0...(#‘𝐹))⟶𝑉 ∧ ∀𝑘 ∈ (0..^(#‘𝐹))if-((𝑃𝑘) = (𝑃‘(𝑘 + 1)), (𝐼‘(𝐹𝑘)) = {(𝑃𝑘)}, {(𝑃𝑘), (𝑃‘(𝑘 + 1))} ⊆ (𝐼‘(𝐹𝑘))))))
7875, 77mpcom 38 . . . . . 6 (𝐹(Walks‘𝐺)𝑃 → (𝐹 ∈ Word dom 𝐼𝑃:(0...(#‘𝐹))⟶𝑉 ∧ ∀𝑘 ∈ (0..^(#‘𝐹))if-((𝑃𝑘) = (𝑃‘(𝑘 + 1)), (𝐼‘(𝐹𝑘)) = {(𝑃𝑘)}, {(𝑃𝑘), (𝑃‘(𝑘 + 1))} ⊆ (𝐼‘(𝐹𝑘)))))
792, 78syl 17 . . . . 5 (𝜑 → (𝐹 ∈ Word dom 𝐼𝑃:(0...(#‘𝐹))⟶𝑉 ∧ ∀𝑘 ∈ (0..^(#‘𝐹))if-((𝑃𝑘) = (𝑃‘(𝑘 + 1)), (𝐼‘(𝐹𝑘)) = {(𝑃𝑘)}, {(𝑃𝑘), (𝑃‘(𝑘 + 1))} ⊆ (𝐼‘(𝐹𝑘)))))
8079adantr 481 . . . 4 ((𝜑𝑥 ∈ (0..^(#‘𝐻))) → (𝐹 ∈ Word dom 𝐼𝑃:(0...(#‘𝐹))⟶𝑉 ∧ ∀𝑘 ∈ (0..^(#‘𝐹))if-((𝑃𝑘) = (𝑃‘(𝑘 + 1)), (𝐼‘(𝐹𝑘)) = {(𝑃𝑘)}, {(𝑃𝑘), (𝑃‘(𝑘 + 1))} ⊆ (𝐼‘(𝐹𝑘)))))
8168oveq2d 6666 . . . . . . . . . . 11 (𝜑 → (0..^(#‘𝐻)) = (0..^𝑁))
8281eleq2d 2687 . . . . . . . . . 10 (𝜑 → (𝑥 ∈ (0..^(#‘𝐻)) ↔ 𝑥 ∈ (0..^𝑁)))
8372fveq1i 6192 . . . . . . . . . . . . 13 (𝑄𝑥) = ((𝑃 ↾ (0...𝑁))‘𝑥)
84 fzossfz 12488 . . . . . . . . . . . . . . . 16 (0..^𝑁) ⊆ (0...𝑁)
8584a1i 11 . . . . . . . . . . . . . . 15 (𝜑 → (0..^𝑁) ⊆ (0...𝑁))
8685sselda 3603 . . . . . . . . . . . . . 14 ((𝜑𝑥 ∈ (0..^𝑁)) → 𝑥 ∈ (0...𝑁))
8786fvresd 6208 . . . . . . . . . . . . 13 ((𝜑𝑥 ∈ (0..^𝑁)) → ((𝑃 ↾ (0...𝑁))‘𝑥) = (𝑃𝑥))
8883, 87syl5req 2669 . . . . . . . . . . . 12 ((𝜑𝑥 ∈ (0..^𝑁)) → (𝑃𝑥) = (𝑄𝑥))
8972fveq1i 6192 . . . . . . . . . . . . 13 (𝑄‘(𝑥 + 1)) = ((𝑃 ↾ (0...𝑁))‘(𝑥 + 1))
90 fzofzp1 12565 . . . . . . . . . . . . . . 15 (𝑥 ∈ (0..^𝑁) → (𝑥 + 1) ∈ (0...𝑁))
9190adantl 482 . . . . . . . . . . . . . 14 ((𝜑𝑥 ∈ (0..^𝑁)) → (𝑥 + 1) ∈ (0...𝑁))
9291fvresd 6208 . . . . . . . . . . . . 13 ((𝜑𝑥 ∈ (0..^𝑁)) → ((𝑃 ↾ (0...𝑁))‘(𝑥 + 1)) = (𝑃‘(𝑥 + 1)))
9389, 92syl5req 2669 . . . . . . . . . . . 12 ((𝜑𝑥 ∈ (0..^𝑁)) → (𝑃‘(𝑥 + 1)) = (𝑄‘(𝑥 + 1)))
9488, 93jca 554 . . . . . . . . . . 11 ((𝜑𝑥 ∈ (0..^𝑁)) → ((𝑃𝑥) = (𝑄𝑥) ∧ (𝑃‘(𝑥 + 1)) = (𝑄‘(𝑥 + 1))))
9594ex 450 . . . . . . . . . 10 (𝜑 → (𝑥 ∈ (0..^𝑁) → ((𝑃𝑥) = (𝑄𝑥) ∧ (𝑃‘(𝑥 + 1)) = (𝑄‘(𝑥 + 1)))))
9682, 95sylbid 230 . . . . . . . . 9 (𝜑 → (𝑥 ∈ (0..^(#‘𝐻)) → ((𝑃𝑥) = (𝑄𝑥) ∧ (𝑃‘(𝑥 + 1)) = (𝑄‘(𝑥 + 1)))))
9796imp 445 . . . . . . . 8 ((𝜑𝑥 ∈ (0..^(#‘𝐻))) → ((𝑃𝑥) = (𝑄𝑥) ∧ (𝑃‘(𝑥 + 1)) = (𝑄‘(𝑥 + 1))))
9825ancli 574 . . . . . . . . . . . . . 14 (𝜑 → (𝜑𝐹 ∈ Word dom 𝐼))
9926ffund 6049 . . . . . . . . . . . . . . . . 17 (𝐹 ∈ Word dom 𝐼 → Fun 𝐹)
10099adantl 482 . . . . . . . . . . . . . . . 16 ((𝜑𝐹 ∈ Word dom 𝐼) → Fun 𝐹)
101100adantr 481 . . . . . . . . . . . . . . 15 (((𝜑𝐹 ∈ Word dom 𝐼) ∧ 𝑥 ∈ (0..^𝑁)) → Fun 𝐹)
102 fdm 6051 . . . . . . . . . . . . . . . . . 18 (𝐹:(0..^(#‘𝐹))⟶dom 𝐼 → dom 𝐹 = (0..^(#‘𝐹)))
103 sseq2 3627 . . . . . . . . . . . . . . . . . . 19 (dom 𝐹 = (0..^(#‘𝐹)) → ((0..^𝑁) ⊆ dom 𝐹 ↔ (0..^𝑁) ⊆ (0..^(#‘𝐹))))
10410, 103syl5ibr 236 . . . . . . . . . . . . . . . . . 18 (dom 𝐹 = (0..^(#‘𝐹)) → (𝜑 → (0..^𝑁) ⊆ dom 𝐹))
10526, 102, 1043syl 18 . . . . . . . . . . . . . . . . 17 (𝐹 ∈ Word dom 𝐼 → (𝜑 → (0..^𝑁) ⊆ dom 𝐹))
106105impcom 446 . . . . . . . . . . . . . . . 16 ((𝜑𝐹 ∈ Word dom 𝐼) → (0..^𝑁) ⊆ dom 𝐹)
107106adantr 481 . . . . . . . . . . . . . . 15 (((𝜑𝐹 ∈ Word dom 𝐼) ∧ 𝑥 ∈ (0..^𝑁)) → (0..^𝑁) ⊆ dom 𝐹)
108 simpr 477 . . . . . . . . . . . . . . 15 (((𝜑𝐹 ∈ Word dom 𝐼) ∧ 𝑥 ∈ (0..^𝑁)) → 𝑥 ∈ (0..^𝑁))
109101, 107, 108resfvresima 6494 . . . . . . . . . . . . . 14 (((𝜑𝐹 ∈ Word dom 𝐼) ∧ 𝑥 ∈ (0..^𝑁)) → ((𝐼 ↾ (𝐹 “ (0..^𝑁)))‘((𝐹 ↾ (0..^𝑁))‘𝑥)) = (𝐼‘(𝐹𝑥)))
11098, 109sylan 488 . . . . . . . . . . . . 13 ((𝜑𝑥 ∈ (0..^𝑁)) → ((𝐼 ↾ (𝐹 “ (0..^𝑁)))‘((𝐹 ↾ (0..^𝑁))‘𝑥)) = (𝐼‘(𝐹𝑥)))
111110eqcomd 2628 . . . . . . . . . . . 12 ((𝜑𝑥 ∈ (0..^𝑁)) → (𝐼‘(𝐹𝑥)) = ((𝐼 ↾ (𝐹 “ (0..^𝑁)))‘((𝐹 ↾ (0..^𝑁))‘𝑥)))
112111ex 450 . . . . . . . . . . 11 (𝜑 → (𝑥 ∈ (0..^𝑁) → (𝐼‘(𝐹𝑥)) = ((𝐼 ↾ (𝐹 “ (0..^𝑁)))‘((𝐹 ↾ (0..^𝑁))‘𝑥))))
11382, 112sylbid 230 . . . . . . . . . 10 (𝜑 → (𝑥 ∈ (0..^(#‘𝐻)) → (𝐼‘(𝐹𝑥)) = ((𝐼 ↾ (𝐹 “ (0..^𝑁)))‘((𝐹 ↾ (0..^𝑁))‘𝑥))))
114113imp 445 . . . . . . . . 9 ((𝜑𝑥 ∈ (0..^(#‘𝐻))) → (𝐼‘(𝐹𝑥)) = ((𝐼 ↾ (𝐹 “ (0..^𝑁)))‘((𝐹 ↾ (0..^𝑁))‘𝑥)))
11539adantr 481 . . . . . . . . . 10 ((𝜑𝑥 ∈ (0..^(#‘𝐻))) → (iEdg‘𝑆) = (𝐼 ↾ (𝐹 “ (0..^𝑁))))
1161fveq1i 6192 . . . . . . . . . . 11 (𝐻𝑥) = ((𝐹 ↾ (0..^𝑁))‘𝑥)
117116a1i 11 . . . . . . . . . 10 ((𝜑𝑥 ∈ (0..^(#‘𝐻))) → (𝐻𝑥) = ((𝐹 ↾ (0..^𝑁))‘𝑥))
118115, 117fveq12d 6197 . . . . . . . . 9 ((𝜑𝑥 ∈ (0..^(#‘𝐻))) → ((iEdg‘𝑆)‘(𝐻𝑥)) = ((𝐼 ↾ (𝐹 “ (0..^𝑁)))‘((𝐹 ↾ (0..^𝑁))‘𝑥)))
119114, 118eqtr4d 2659 . . . . . . . 8 ((𝜑𝑥 ∈ (0..^(#‘𝐻))) → (𝐼‘(𝐹𝑥)) = ((iEdg‘𝑆)‘(𝐻𝑥)))
12097, 119jca 554 . . . . . . 7 ((𝜑𝑥 ∈ (0..^(#‘𝐻))) → (((𝑃𝑥) = (𝑄𝑥) ∧ (𝑃‘(𝑥 + 1)) = (𝑄‘(𝑥 + 1))) ∧ (𝐼‘(𝐹𝑥)) = ((iEdg‘𝑆)‘(𝐻𝑥))))
1217, 8syl 17 . . . . . . . . . . 11 (𝜑 → (#‘𝐹) ∈ (ℤ𝑁))
1221a1i 11 . . . . . . . . . . . . . 14 (𝜑𝐻 = (𝐹 ↾ (0..^𝑁)))
123122fveq2d 6195 . . . . . . . . . . . . 13 (𝜑 → (#‘𝐻) = (#‘(𝐹 ↾ (0..^𝑁))))
124123, 50eqtrd 2656 . . . . . . . . . . . 12 (𝜑 → (#‘𝐻) = 𝑁)
125124fveq2d 6195 . . . . . . . . . . 11 (𝜑 → (ℤ‘(#‘𝐻)) = (ℤ𝑁))
126121, 125eleqtrrd 2704 . . . . . . . . . 10 (𝜑 → (#‘𝐹) ∈ (ℤ‘(#‘𝐻)))
127 fzoss2 12496 . . . . . . . . . 10 ((#‘𝐹) ∈ (ℤ‘(#‘𝐻)) → (0..^(#‘𝐻)) ⊆ (0..^(#‘𝐹)))
128126, 127syl 17 . . . . . . . . 9 (𝜑 → (0..^(#‘𝐻)) ⊆ (0..^(#‘𝐹)))
129128sselda 3603 . . . . . . . 8 ((𝜑𝑥 ∈ (0..^(#‘𝐻))) → 𝑥 ∈ (0..^(#‘𝐹)))
130 wkslem1 26503 . . . . . . . . 9 (𝑘 = 𝑥 → (if-((𝑃𝑘) = (𝑃‘(𝑘 + 1)), (𝐼‘(𝐹𝑘)) = {(𝑃𝑘)}, {(𝑃𝑘), (𝑃‘(𝑘 + 1))} ⊆ (𝐼‘(𝐹𝑘))) ↔ if-((𝑃𝑥) = (𝑃‘(𝑥 + 1)), (𝐼‘(𝐹𝑥)) = {(𝑃𝑥)}, {(𝑃𝑥), (𝑃‘(𝑥 + 1))} ⊆ (𝐼‘(𝐹𝑥)))))
131130rspcv 3305 . . . . . . . 8 (𝑥 ∈ (0..^(#‘𝐹)) → (∀𝑘 ∈ (0..^(#‘𝐹))if-((𝑃𝑘) = (𝑃‘(𝑘 + 1)), (𝐼‘(𝐹𝑘)) = {(𝑃𝑘)}, {(𝑃𝑘), (𝑃‘(𝑘 + 1))} ⊆ (𝐼‘(𝐹𝑘))) → if-((𝑃𝑥) = (𝑃‘(𝑥 + 1)), (𝐼‘(𝐹𝑥)) = {(𝑃𝑥)}, {(𝑃𝑥), (𝑃‘(𝑥 + 1))} ⊆ (𝐼‘(𝐹𝑥)))))
132129, 131syl 17 . . . . . . 7 ((𝜑𝑥 ∈ (0..^(#‘𝐻))) → (∀𝑘 ∈ (0..^(#‘𝐹))if-((𝑃𝑘) = (𝑃‘(𝑘 + 1)), (𝐼‘(𝐹𝑘)) = {(𝑃𝑘)}, {(𝑃𝑘), (𝑃‘(𝑘 + 1))} ⊆ (𝐼‘(𝐹𝑘))) → if-((𝑃𝑥) = (𝑃‘(𝑥 + 1)), (𝐼‘(𝐹𝑥)) = {(𝑃𝑥)}, {(𝑃𝑥), (𝑃‘(𝑥 + 1))} ⊆ (𝐼‘(𝐹𝑥)))))
133 eqeq12 2635 . . . . . . . . . 10 (((𝑃𝑥) = (𝑄𝑥) ∧ (𝑃‘(𝑥 + 1)) = (𝑄‘(𝑥 + 1))) → ((𝑃𝑥) = (𝑃‘(𝑥 + 1)) ↔ (𝑄𝑥) = (𝑄‘(𝑥 + 1))))
134133adantr 481 . . . . . . . . 9 ((((𝑃𝑥) = (𝑄𝑥) ∧ (𝑃‘(𝑥 + 1)) = (𝑄‘(𝑥 + 1))) ∧ (𝐼‘(𝐹𝑥)) = ((iEdg‘𝑆)‘(𝐻𝑥))) → ((𝑃𝑥) = (𝑃‘(𝑥 + 1)) ↔ (𝑄𝑥) = (𝑄‘(𝑥 + 1))))
135 simpr 477 . . . . . . . . . 10 ((((𝑃𝑥) = (𝑄𝑥) ∧ (𝑃‘(𝑥 + 1)) = (𝑄‘(𝑥 + 1))) ∧ (𝐼‘(𝐹𝑥)) = ((iEdg‘𝑆)‘(𝐻𝑥))) → (𝐼‘(𝐹𝑥)) = ((iEdg‘𝑆)‘(𝐻𝑥)))
136 sneq 4187 . . . . . . . . . . . 12 ((𝑃𝑥) = (𝑄𝑥) → {(𝑃𝑥)} = {(𝑄𝑥)})
137136adantr 481 . . . . . . . . . . 11 (((𝑃𝑥) = (𝑄𝑥) ∧ (𝑃‘(𝑥 + 1)) = (𝑄‘(𝑥 + 1))) → {(𝑃𝑥)} = {(𝑄𝑥)})
138137adantr 481 . . . . . . . . . 10 ((((𝑃𝑥) = (𝑄𝑥) ∧ (𝑃‘(𝑥 + 1)) = (𝑄‘(𝑥 + 1))) ∧ (𝐼‘(𝐹𝑥)) = ((iEdg‘𝑆)‘(𝐻𝑥))) → {(𝑃𝑥)} = {(𝑄𝑥)})
139135, 138eqeq12d 2637 . . . . . . . . 9 ((((𝑃𝑥) = (𝑄𝑥) ∧ (𝑃‘(𝑥 + 1)) = (𝑄‘(𝑥 + 1))) ∧ (𝐼‘(𝐹𝑥)) = ((iEdg‘𝑆)‘(𝐻𝑥))) → ((𝐼‘(𝐹𝑥)) = {(𝑃𝑥)} ↔ ((iEdg‘𝑆)‘(𝐻𝑥)) = {(𝑄𝑥)}))
140 preq12 4270 . . . . . . . . . . 11 (((𝑃𝑥) = (𝑄𝑥) ∧ (𝑃‘(𝑥 + 1)) = (𝑄‘(𝑥 + 1))) → {(𝑃𝑥), (𝑃‘(𝑥 + 1))} = {(𝑄𝑥), (𝑄‘(𝑥 + 1))})
141140adantr 481 . . . . . . . . . 10 ((((𝑃𝑥) = (𝑄𝑥) ∧ (𝑃‘(𝑥 + 1)) = (𝑄‘(𝑥 + 1))) ∧ (𝐼‘(𝐹𝑥)) = ((iEdg‘𝑆)‘(𝐻𝑥))) → {(𝑃𝑥), (𝑃‘(𝑥 + 1))} = {(𝑄𝑥), (𝑄‘(𝑥 + 1))})
142141, 135sseq12d 3634 . . . . . . . . 9 ((((𝑃𝑥) = (𝑄𝑥) ∧ (𝑃‘(𝑥 + 1)) = (𝑄‘(𝑥 + 1))) ∧ (𝐼‘(𝐹𝑥)) = ((iEdg‘𝑆)‘(𝐻𝑥))) → ({(𝑃𝑥), (𝑃‘(𝑥 + 1))} ⊆ (𝐼‘(𝐹𝑥)) ↔ {(𝑄𝑥), (𝑄‘(𝑥 + 1))} ⊆ ((iEdg‘𝑆)‘(𝐻𝑥))))
143134, 139, 142ifpbi123d 1027 . . . . . . . 8 ((((𝑃𝑥) = (𝑄𝑥) ∧ (𝑃‘(𝑥 + 1)) = (𝑄‘(𝑥 + 1))) ∧ (𝐼‘(𝐹𝑥)) = ((iEdg‘𝑆)‘(𝐻𝑥))) → (if-((𝑃𝑥) = (𝑃‘(𝑥 + 1)), (𝐼‘(𝐹𝑥)) = {(𝑃𝑥)}, {(𝑃𝑥), (𝑃‘(𝑥 + 1))} ⊆ (𝐼‘(𝐹𝑥))) ↔ if-((𝑄𝑥) = (𝑄‘(𝑥 + 1)), ((iEdg‘𝑆)‘(𝐻𝑥)) = {(𝑄𝑥)}, {(𝑄𝑥), (𝑄‘(𝑥 + 1))} ⊆ ((iEdg‘𝑆)‘(𝐻𝑥)))))
144143biimpd 219 . . . . . . 7 ((((𝑃𝑥) = (𝑄𝑥) ∧ (𝑃‘(𝑥 + 1)) = (𝑄‘(𝑥 + 1))) ∧ (𝐼‘(𝐹𝑥)) = ((iEdg‘𝑆)‘(𝐻𝑥))) → (if-((𝑃𝑥) = (𝑃‘(𝑥 + 1)), (𝐼‘(𝐹𝑥)) = {(𝑃𝑥)}, {(𝑃𝑥), (𝑃‘(𝑥 + 1))} ⊆ (𝐼‘(𝐹𝑥))) → if-((𝑄𝑥) = (𝑄‘(𝑥 + 1)), ((iEdg‘𝑆)‘(𝐻𝑥)) = {(𝑄𝑥)}, {(𝑄𝑥), (𝑄‘(𝑥 + 1))} ⊆ ((iEdg‘𝑆)‘(𝐻𝑥)))))
145120, 132, 144sylsyld 61 . . . . . 6 ((𝜑𝑥 ∈ (0..^(#‘𝐻))) → (∀𝑘 ∈ (0..^(#‘𝐹))if-((𝑃𝑘) = (𝑃‘(𝑘 + 1)), (𝐼‘(𝐹𝑘)) = {(𝑃𝑘)}, {(𝑃𝑘), (𝑃‘(𝑘 + 1))} ⊆ (𝐼‘(𝐹𝑘))) → if-((𝑄𝑥) = (𝑄‘(𝑥 + 1)), ((iEdg‘𝑆)‘(𝐻𝑥)) = {(𝑄𝑥)}, {(𝑄𝑥), (𝑄‘(𝑥 + 1))} ⊆ ((iEdg‘𝑆)‘(𝐻𝑥)))))
146145com12 32 . . . . 5 (∀𝑘 ∈ (0..^(#‘𝐹))if-((𝑃𝑘) = (𝑃‘(𝑘 + 1)), (𝐼‘(𝐹𝑘)) = {(𝑃𝑘)}, {(𝑃𝑘), (𝑃‘(𝑘 + 1))} ⊆ (𝐼‘(𝐹𝑘))) → ((𝜑𝑥 ∈ (0..^(#‘𝐻))) → if-((𝑄𝑥) = (𝑄‘(𝑥 + 1)), ((iEdg‘𝑆)‘(𝐻𝑥)) = {(𝑄𝑥)}, {(𝑄𝑥), (𝑄‘(𝑥 + 1))} ⊆ ((iEdg‘𝑆)‘(𝐻𝑥)))))
1471463ad2ant3 1084 . . . 4 ((𝐹 ∈ Word dom 𝐼𝑃:(0...(#‘𝐹))⟶𝑉 ∧ ∀𝑘 ∈ (0..^(#‘𝐹))if-((𝑃𝑘) = (𝑃‘(𝑘 + 1)), (𝐼‘(𝐹𝑘)) = {(𝑃𝑘)}, {(𝑃𝑘), (𝑃‘(𝑘 + 1))} ⊆ (𝐼‘(𝐹𝑘)))) → ((𝜑𝑥 ∈ (0..^(#‘𝐻))) → if-((𝑄𝑥) = (𝑄‘(𝑥 + 1)), ((iEdg‘𝑆)‘(𝐻𝑥)) = {(𝑄𝑥)}, {(𝑄𝑥), (𝑄‘(𝑥 + 1))} ⊆ ((iEdg‘𝑆)‘(𝐻𝑥)))))
14880, 147mpcom 38 . . 3 ((𝜑𝑥 ∈ (0..^(#‘𝐻))) → if-((𝑄𝑥) = (𝑄‘(𝑥 + 1)), ((iEdg‘𝑆)‘(𝐻𝑥)) = {(𝑄𝑥)}, {(𝑄𝑥), (𝑄‘(𝑥 + 1))} ⊆ ((iEdg‘𝑆)‘(𝐻𝑥))))
149148ralrimiva 2966 . 2 (𝜑 → ∀𝑥 ∈ (0..^(#‘𝐻))if-((𝑄𝑥) = (𝑄‘(𝑥 + 1)), ((iEdg‘𝑆)‘(𝐻𝑥)) = {(𝑄𝑥)}, {(𝑄𝑥), (𝑄‘(𝑥 + 1))} ⊆ ((iEdg‘𝑆)‘(𝐻𝑥))))
15057, 3, 2, 7, 60, 39, 1, 72wlkreslem 26566 . . 3 (𝜑 → (𝑆 ∈ V ∧ 𝐻 ∈ V ∧ 𝑄 ∈ V))
151 eqid 2622 . . . 4 (Vtx‘𝑆) = (Vtx‘𝑆)
152 eqid 2622 . . . 4 (iEdg‘𝑆) = (iEdg‘𝑆)
153151, 152iswlk 26506 . . 3 ((𝑆 ∈ V ∧ 𝐻 ∈ V ∧ 𝑄 ∈ V) → (𝐻(Walks‘𝑆)𝑄 ↔ (𝐻 ∈ Word dom (iEdg‘𝑆) ∧ 𝑄:(0...(#‘𝐻))⟶(Vtx‘𝑆) ∧ ∀𝑥 ∈ (0..^(#‘𝐻))if-((𝑄𝑥) = (𝑄‘(𝑥 + 1)), ((iEdg‘𝑆)‘(𝐻𝑥)) = {(𝑄𝑥)}, {(𝑄𝑥), (𝑄‘(𝑥 + 1))} ⊆ ((iEdg‘𝑆)‘(𝐻𝑥))))))
154150, 153syl 17 . 2 (𝜑 → (𝐻(Walks‘𝑆)𝑄 ↔ (𝐻 ∈ Word dom (iEdg‘𝑆) ∧ 𝑄:(0...(#‘𝐻))⟶(Vtx‘𝑆) ∧ ∀𝑥 ∈ (0..^(#‘𝐻))if-((𝑄𝑥) = (𝑄‘(𝑥 + 1)), ((iEdg‘𝑆)‘(𝐻𝑥)) = {(𝑄𝑥)}, {(𝑄𝑥), (𝑄‘(𝑥 + 1))} ⊆ ((iEdg‘𝑆)‘(𝐻𝑥))))))
15556, 74, 149, 154mpbir3and 1245 1 (𝜑𝐻(Walks‘𝑆)𝑄)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 196  wa 384  if-wif 1012  w3a 1037   = wceq 1483  wcel 1990  wral 2912  wrex 2913  Vcvv 3200  cin 3573  wss 3574  {csn 4177  {cpr 4179   class class class wbr 4653  dom cdm 5114  cres 5116  cima 5117  Fun wfun 5882   Fn wfn 5883  wf 5884  cfv 5888  (class class class)co 6650  0cc0 9936  1c1 9937   + caddc 9939  cuz 11687  ...cfz 12326  ..^cfzo 12465  #chash 13117  Word cword 13291  Vtxcvtx 25874  iEdgciedg 25875  Walkscwlks 26492
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-rep 4771  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906  ax-un 6949  ax-cnex 9992  ax-resscn 9993  ax-1cn 9994  ax-icn 9995  ax-addcl 9996  ax-addrcl 9997  ax-mulcl 9998  ax-mulrcl 9999  ax-mulcom 10000  ax-addass 10001  ax-mulass 10002  ax-distr 10003  ax-i2m1 10004  ax-1ne0 10005  ax-1rid 10006  ax-rnegex 10007  ax-rrecex 10008  ax-cnre 10009  ax-pre-lttri 10010  ax-pre-lttrn 10011  ax-pre-ltadd 10012  ax-pre-mulgt0 10013
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-ifp 1013  df-3or 1038  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-nel 2898  df-ral 2917  df-rex 2918  df-reu 2919  df-rab 2921  df-v 3202  df-sbc 3436  df-csb 3534  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-pss 3590  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-tp 4182  df-op 4184  df-uni 4437  df-int 4476  df-iun 4522  df-br 4654  df-opab 4713  df-mpt 4730  df-tr 4753  df-id 5024  df-eprel 5029  df-po 5035  df-so 5036  df-fr 5073  df-we 5075  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-pred 5680  df-ord 5726  df-on 5727  df-lim 5728  df-suc 5729  df-iota 5851  df-fun 5890  df-fn 5891  df-f 5892  df-f1 5893  df-fo 5894  df-f1o 5895  df-fv 5896  df-riota 6611  df-ov 6653  df-oprab 6654  df-mpt2 6655  df-om 7066  df-1st 7168  df-2nd 7169  df-wrecs 7407  df-recs 7468  df-rdg 7506  df-1o 7560  df-oadd 7564  df-er 7742  df-map 7859  df-pm 7860  df-en 7956  df-dom 7957  df-sdom 7958  df-fin 7959  df-card 8765  df-pnf 10076  df-mnf 10077  df-xr 10078  df-ltxr 10079  df-le 10080  df-sub 10268  df-neg 10269  df-nn 11021  df-n0 11293  df-z 11378  df-uz 11688  df-fz 12327  df-fzo 12466  df-hash 13118  df-word 13299  df-substr 13303  df-wlks 26495
This theorem is referenced by:  trlres  26597  eupthres  27075
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