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Theorem wlkp1lem1 29765

Description: Lemma for wlkp1 29773. (Contributed by AV, 6-Mar-2021.)

**Hypotheses**
Ref	Expression
wlkp1.v	⊢ 𝑉 = (Vtx‘𝐺)
wlkp1.i	⊢ 𝐼 = (iEdg‘𝐺)
wlkp1.f	⊢ (𝜑 → Fun 𝐼)
wlkp1.a	⊢ (𝜑 → 𝐼 ∈ Fin)
wlkp1.b	⊢ (𝜑 → 𝐵 ∈ 𝑊)
wlkp1.c	⊢ (𝜑 → 𝐶 ∈ 𝑉)
wlkp1.d	⊢ (𝜑 → ¬ 𝐵 ∈ dom 𝐼)
wlkp1.w	⊢ (𝜑 → 𝐹(Walks‘𝐺)𝑃)
wlkp1.n	⊢ 𝑁 = (♯‘𝐹)

**Assertion**
Ref	Expression
wlkp1lem1	⊢ (𝜑 → ¬ (𝑁 + 1) ∈ dom 𝑃)

**Proof of Theorem wlkp1lem1**
Step	Hyp	Ref	Expression
1		wlkp1.w	. 2 ⊢ (𝜑 → 𝐹(Walks‘𝐺)𝑃)
2		wlkcl 29709	. . 3 ⊢ (𝐹(Walks‘𝐺)𝑃 → (♯‘𝐹) ∈ ℕ₀)
3		wlkp1.v	. . . 4 ⊢ 𝑉 = (Vtx‘𝐺)
4	3	wlkp 29710	. . 3 ⊢ (𝐹(Walks‘𝐺)𝑃 → 𝑃:(0...(♯‘𝐹))⟶𝑉)
5	2, 4	jca 516	. 2 ⊢ (𝐹(Walks‘𝐺)𝑃 → ((♯‘𝐹) ∈ ℕ₀ ∧ 𝑃:(0...(♯‘𝐹))⟶𝑉))
6		fzp1nel 13563	. . . . . 6 ⊢ ¬ ((♯‘𝐹) + 1) ∈ (0...(♯‘𝐹))
7	6	a1i 11	. . . . 5 ⊢ ((♯‘𝐹) ∈ ℕ₀ → ¬ ((♯‘𝐹) + 1) ∈ (0...(♯‘𝐹)))
8		wlkp1.n	. . . . . . 7 ⊢ 𝑁 = (♯‘𝐹)
9	8	oveq1i 7373	. . . . . 6 ⊢ (𝑁 + 1) = ((♯‘𝐹) + 1)
10	9	eleq1i 2831	. . . . 5 ⊢ ((𝑁 + 1) ∈ (0...(♯‘𝐹)) ↔ ((♯‘𝐹) + 1) ∈ (0...(♯‘𝐹)))
11	7, 10	sylnibr 330	. . . 4 ⊢ ((♯‘𝐹) ∈ ℕ₀ → ¬ (𝑁 + 1) ∈ (0...(♯‘𝐹)))
12		eleq2 2829	. . . . 5 ⊢ (dom 𝑃 = (0...(♯‘𝐹)) → ((𝑁 + 1) ∈ dom 𝑃 ↔ (𝑁 + 1) ∈ (0...(♯‘𝐹))))
13	12	notbid 319	. . . 4 ⊢ (dom 𝑃 = (0...(♯‘𝐹)) → (¬ (𝑁 + 1) ∈ dom 𝑃 ↔ ¬ (𝑁 + 1) ∈ (0...(♯‘𝐹))))
14	11, 13	syl5ibrcom 248	. . 3 ⊢ ((♯‘𝐹) ∈ ℕ₀ → (dom 𝑃 = (0...(♯‘𝐹)) → ¬ (𝑁 + 1) ∈ dom 𝑃))
15		fdm 6671	. . 3 ⊢ (𝑃:(0...(♯‘𝐹))⟶𝑉 → dom 𝑃 = (0...(♯‘𝐹)))
16	14, 15	impel 510	. 2 ⊢ (((♯‘𝐹) ∈ ℕ₀ ∧ 𝑃:(0...(♯‘𝐹))⟶𝑉) → ¬ (𝑁 + 1) ∈ dom 𝑃)
17	1, 5, 16	3syl 18	1 ⊢ (𝜑 → ¬ (𝑁 + 1) ∈ dom 𝑃)

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ∧ wa 396 = wceq 1547 ∈ wcel 2119 class class class wbr 5079 dom cdm 5625 Fun wfun 6486 ⟶wf 6488 ‘cfv 6492 (class class class)co 7363 Fincfn 8890 0cc0 11036 1c1 11037 + caddc 11039 ℕ₀cn0 12435 ...cfz 13459 ♯chash 14290 Vtxcvtx 29090 iEdgciedg 29091 Walkscwlks 29690

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1974 ax-7 2015 ax-8 2121 ax-9 2129 ax-10 2152 ax-11 2168 ax-12 2189 ax-ext 2712 ax-rep 5206 ax-sep 5225 ax-nul 5235 ax-pow 5301 ax-pr 5369 ax-un 7685 ax-cnex 11092 ax-resscn 11093 ax-1cn 11094 ax-icn 11095 ax-addcl 11096 ax-addrcl 11097 ax-mulcl 11098 ax-mulrcl 11099 ax-mulcom 11100 ax-addass 11101 ax-mulass 11102 ax-distr 11103 ax-i2m1 11104 ax-1ne0 11105 ax-1rid 11106 ax-rnegex 11107 ax-rrecex 11108 ax-cnre 11109 ax-pre-lttri 11110 ax-pre-lttrn 11111 ax-pre-ltadd 11112 ax-pre-mulgt0 11113

This theorem depends on definitions: df-bi 208 df-an 397 df-or 854 df-ifp 1069 df-3or 1093 df-3an 1094 df-tru 1550 df-fal 1560 df-ex 1787 df-nf 1791 df-sb 2074 df-mo 2543 df-eu 2573 df-clab 2719 df-cleq 2732 df-clel 2815 df-nfc 2889 df-ne 2936 df-nel 3040 df-ral 3055 df-rex 3065 df-reu 3346 df-rab 3393 df-v 3434 df-sbc 3731 df-csb 3839 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-pss 3910 df-nul 4269 df-if 4462 df-pw 4538 df-sn 4563 df-pr 4565 df-op 4569 df-uni 4846 df-int 4885 df-iun 4930 df-br 5080 df-opab 5142 df-mpt 5161 df-tr 5187 df-id 5520 df-eprel 5525 df-po 5533 df-so 5534 df-fr 5578 df-we 5580 df-xp 5631 df-rel 5632 df-cnv 5633 df-co 5634 df-dm 5635 df-rn 5636 df-res 5637 df-ima 5638 df-pred 6259 df-ord 6320 df-on 6321 df-lim 6322 df-suc 6323 df-iota 6448 df-fun 6494 df-fn 6495 df-f 6496 df-f1 6497 df-fo 6498 df-f1o 6499 df-fv 6500 df-riota 7320 df-ov 7366 df-oprab 7367 df-mpo 7368 df-om 7814 df-1st 7938 df-2nd 7939 df-frecs 8228 df-wrecs 8259 df-recs 8308 df-rdg 8346 df-1o 8402 df-er 8640 df-map 8772 df-en 8891 df-dom 8892 df-sdom 8893 df-fin 8894 df-card 9861 df-pnf 11179 df-mnf 11180 df-xr 11181 df-ltxr 11182 df-le 11183 df-sub 11377 df-neg 11378 df-nn 12173 df-n0 12436 df-z 12523 df-uz 12787 df-fz 13460 df-fzo 13607 df-hash 14291 df-word 14474 df-wlks 29693

This theorem is referenced by: wlkp1lem7 29771 wlkp1lem8 29772 eupth2eucrct 30312

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