Theorem konigsberglem3 16645

Description: Lemma 3 for konigsberg 16648: Vertex 3 has degree three. (Contributed by Mario Carneiro, 11-Mar-2015.) (Revised by Mario Carneiro, 28-Feb-2016.) (Revised by AV, 4-Mar-2021.)

Hypotheses

Ref	Expression
konigsberg.v	⊢ 𝑉 = (0...3)
konigsberg.e	⊢ 𝐸 = ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3} {2, 3}”⟩
konigsberg.g	⊢ 𝐺 = ⟨𝑉, 𝐸⟩

Assertion

Ref	Expression
konigsberglem3	⊢ ((VtxDeg‘𝐺)‘3) = 3

Proof of Theorem konigsberglem3

Dummy variable 𝑥 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		0z 9634	. . . . . . . 8 ⊢ 0 ∈ ℤ
2		3z 9652	. . . . . . . 8 ⊢ 3 ∈ ℤ
3		fzfig 10845	. . . . . . . 8 ⊢ ((0 ∈ ℤ ∧ 3 ∈ ℤ) → (0...3) ∈ Fin)
4	1, 2, 3	mp2an 430	. . . . . . 7 ⊢ (0...3) ∈ Fin
5	4	elexi 2834	. . . . . 6 ⊢ (0...3) ∈ V
6		0nn0 9557	. . . . . . . . . . 11 ⊢ 0 ∈ ℕ0
7		1nn0 9558	. . . . . . . . . . 11 ⊢ 1 ∈ ℕ0
8		prexg 4344	. . . . . . . . . . 11 ⊢ ((0 ∈ ℕ0 ∧ 1 ∈ ℕ0) → {0, 1} ∈ V)
9	6, 7, 8	mp2an 430	. . . . . . . . . 10 ⊢ {0, 1} ∈ V
10	9	a1i 9	. . . . . . . . 9 ⊢ (⊤ → {0, 1} ∈ V)
11		2nn0 9559	. . . . . . . . . . 11 ⊢ 2 ∈ ℕ0
12		prexg 4344	. . . . . . . . . . 11 ⊢ ((0 ∈ ℕ0 ∧ 2 ∈ ℕ0) → {0, 2} ∈ V)
13	6, 11, 12	mp2an 430	. . . . . . . . . 10 ⊢ {0, 2} ∈ V
14	13	a1i 9	. . . . . . . . 9 ⊢ (⊤ → {0, 2} ∈ V)
15		3nn0 9560	. . . . . . . . . . 11 ⊢ 3 ∈ ℕ0
16		prexg 4344	. . . . . . . . . . 11 ⊢ ((0 ∈ ℕ0 ∧ 3 ∈ ℕ0) → {0, 3} ∈ V)
17	6, 15, 16	mp2an 430	. . . . . . . . . 10 ⊢ {0, 3} ∈ V
18	17	a1i 9	. . . . . . . . 9 ⊢ (⊤ → {0, 3} ∈ V)
19		prexg 4344	. . . . . . . . . . 11 ⊢ ((1 ∈ ℕ0 ∧ 2 ∈ ℕ0) → {1, 2} ∈ V)
20	7, 11, 19	mp2an 430	. . . . . . . . . 10 ⊢ {1, 2} ∈ V
21	20	a1i 9	. . . . . . . . 9 ⊢ (⊤ → {1, 2} ∈ V)
22		prexg 4344	. . . . . . . . . . 11 ⊢ ((2 ∈ ℕ0 ∧ 3 ∈ ℕ0) → {2, 3} ∈ V)
23	11, 15, 22	mp2an 430	. . . . . . . . . 10 ⊢ {2, 3} ∈ V
24	23	a1i 9	. . . . . . . . 9 ⊢ (⊤ → {2, 3} ∈ V)
25	10, 14, 18, 21, 21, 24	s6cld 11532	. . . . . . . 8 ⊢ (⊤ → ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3}”⟩ ∈ Word V)
26	25	mptru 1411	. . . . . . 7 ⊢ ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3}”⟩ ∈ Word V
27	26	elexi 2834	. . . . . 6 ⊢ ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3}”⟩ ∈ V
28	5, 27	opvtxfvi 16182	. . . . 5 ⊢ (Vtx‘⟨(0...3), ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3}”⟩⟩) = (0...3)
29	28	eqcomi 2242	. . . 4 ⊢ (0...3) = (Vtx‘⟨(0...3), ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3}”⟩⟩)
30		nn0fz0 10504	. . . . . 6 ⊢ (3 ∈ ℕ0 ↔ 3 ∈ (0...3))
31	15, 30	mpbi 145	. . . . 5 ⊢ 3 ∈ (0...3)
32	31	a1i 9	. . . 4 ⊢ (⊤ → 3 ∈ (0...3))
33	5, 27	opiedgfvi 16183	. . . . 5 ⊢ (iEdg‘⟨(0...3), ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3}”⟩⟩) = ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3}”⟩
34	33	eqcomi 2242	. . . 4 ⊢ ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3}”⟩ = (iEdg‘⟨(0...3), ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3}”⟩⟩)
35	24	s1cld 11368	. . . . . . 7 ⊢ (⊤ → ⟨“{2, 3}”⟩ ∈ Word V)
36	35	mptru 1411	. . . . . 6 ⊢ ⟨“{2, 3}”⟩ ∈ Word V
37		df-s7 11511	. . . . . 6 ⊢ ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3} {2, 3}”⟩ = (⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3}”⟩ ++ ⟨“{2, 3}”⟩)
38		eqid 2238	. . . . . . 7 ⊢ (0...3) = (0...3)
39		eqid 2238	. . . . . . 7 ⊢ ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3} {2, 3}”⟩ = ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3} {2, 3}”⟩
40		eqid 2238	. . . . . . 7 ⊢ ⟨(0...3), ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3} {2, 3}”⟩⟩ = ⟨(0...3), ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3} {2, 3}”⟩⟩
41	38, 39, 40	konigsbergssiedgwen 16641	. . . . . 6 ⊢ ((⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3}”⟩ ∈ Word V ∧ ⟨“{2, 3}”⟩ ∈ Word V ∧ ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3} {2, 3}”⟩ = (⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3}”⟩ ++ ⟨“{2, 3}”⟩)) → ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3}”⟩ ∈ Word {𝑥 ∈ 𝒫 (0...3) ∣ (𝑥 ≈ 1o ∨ 𝑥 ≈ 2o)})
42	26, 36, 37, 41	mp3an 1378	. . . . 5 ⊢ ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3}”⟩ ∈ Word {𝑥 ∈ 𝒫 (0...3) ∣ (𝑥 ≈ 1o ∨ 𝑥 ≈ 2o)}
43	42	a1i 9	. . . 4 ⊢ (⊤ → ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3}”⟩ ∈ Word {𝑥 ∈ 𝒫 (0...3) ∣ (𝑥 ≈ 1o ∨ 𝑥 ≈ 2o)})
44	10, 14, 18, 21, 21	s5cld 11531	. . . . . . . . . 10 ⊢ (⊤ → ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2}”⟩ ∈ Word V)
45	44	mptru 1411	. . . . . . . . 9 ⊢ ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2}”⟩ ∈ Word V
46	45	elexi 2834	. . . . . . . 8 ⊢ ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2}”⟩ ∈ V
47	5, 46	opvtxfvi 16182	. . . . . . 7 ⊢ (Vtx‘⟨(0...3), ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2}”⟩⟩) = (0...3)
48	47	eqcomi 2242	. . . . . 6 ⊢ (0...3) = (Vtx‘⟨(0...3), ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2}”⟩⟩)
49	5, 46	opiedgfvi 16183	. . . . . . 7 ⊢ (iEdg‘⟨(0...3), ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2}”⟩⟩) = ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2}”⟩
50	49	eqcomi 2242	. . . . . 6 ⊢ ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2}”⟩ = (iEdg‘⟨(0...3), ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2}”⟩⟩)
51	24, 24	s2cld 11528	. . . . . . 7 ⊢ (⊤ → ⟨“{2, 3} {2, 3}”⟩ ∈ Word V)
52	10, 14, 18, 21, 21, 24, 24	s5s2d 11555	. . . . . . 7 ⊢ (⊤ → ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3} {2, 3}”⟩ = (⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2}”⟩ ++ ⟨“{2, 3} {2, 3}”⟩))
53	38, 39, 40	konigsbergssiedgwen 16641	. . . . . . 7 ⊢ ((⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2}”⟩ ∈ Word V ∧ ⟨“{2, 3} {2, 3}”⟩ ∈ Word V ∧ ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3} {2, 3}”⟩ = (⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2}”⟩ ++ ⟨“{2, 3} {2, 3}”⟩)) → ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2}”⟩ ∈ Word {𝑥 ∈ 𝒫 (0...3) ∣ (𝑥 ≈ 1o ∨ 𝑥 ≈ 2o)})
54	44, 51, 52, 53	syl3anc 1278	. . . . . 6 ⊢ (⊤ → ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2}”⟩ ∈ Word {𝑥 ∈ 𝒫 (0...3) ∣ (𝑥 ≈ 1o ∨ 𝑥 ≈ 2o)})
55	10, 14, 18, 21	s4cld 11530	. . . . . . . . . . 11 ⊢ (⊤ → ⟨“{0, 1} {0, 2} {0, 3} {1, 2}”⟩ ∈ Word V)
56	55	mptru 1411	. . . . . . . . . 10 ⊢ ⟨“{0, 1} {0, 2} {0, 3} {1, 2}”⟩ ∈ Word V
57	56	elexi 2834	. . . . . . . . 9 ⊢ ⟨“{0, 1} {0, 2} {0, 3} {1, 2}”⟩ ∈ V
58	5, 57	opvtxfvi 16182	. . . . . . . 8 ⊢ (Vtx‘⟨(0...3), ⟨“{0, 1} {0, 2} {0, 3} {1, 2}”⟩⟩) = (0...3)
59	58	eqcomi 2242	. . . . . . 7 ⊢ (0...3) = (Vtx‘⟨(0...3), ⟨“{0, 1} {0, 2} {0, 3} {1, 2}”⟩⟩)
60	5, 57	opiedgfvi 16183	. . . . . . . 8 ⊢ (iEdg‘⟨(0...3), ⟨“{0, 1} {0, 2} {0, 3} {1, 2}”⟩⟩) = ⟨“{0, 1} {0, 2} {0, 3} {1, 2}”⟩
61	60	eqcomi 2242	. . . . . . 7 ⊢ ⟨“{0, 1} {0, 2} {0, 3} {1, 2}”⟩ = (iEdg‘⟨(0...3), ⟨“{0, 1} {0, 2} {0, 3} {1, 2}”⟩⟩)
62	21, 24, 24	s3cld 11529	. . . . . . . 8 ⊢ (⊤ → ⟨“{1, 2} {2, 3} {2, 3}”⟩ ∈ Word V)
63	10, 14, 18, 21, 21, 24, 24	s4s3d 11552	. . . . . . . 8 ⊢ (⊤ → ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3} {2, 3}”⟩ = (⟨“{0, 1} {0, 2} {0, 3} {1, 2}”⟩ ++ ⟨“{1, 2} {2, 3} {2, 3}”⟩))
64	38, 39, 40	konigsbergssiedgwen 16641	. . . . . . . 8 ⊢ ((⟨“{0, 1} {0, 2} {0, 3} {1, 2}”⟩ ∈ Word V ∧ ⟨“{1, 2} {2, 3} {2, 3}”⟩ ∈ Word V ∧ ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3} {2, 3}”⟩ = (⟨“{0, 1} {0, 2} {0, 3} {1, 2}”⟩ ++ ⟨“{1, 2} {2, 3} {2, 3}”⟩)) → ⟨“{0, 1} {0, 2} {0, 3} {1, 2}”⟩ ∈ Word {𝑥 ∈ 𝒫 (0...3) ∣ (𝑥 ≈ 1o ∨ 𝑥 ≈ 2o)})
65	55, 62, 63, 64	syl3anc 1278	. . . . . . 7 ⊢ (⊤ → ⟨“{0, 1} {0, 2} {0, 3} {1, 2}”⟩ ∈ Word {𝑥 ∈ 𝒫 (0...3) ∣ (𝑥 ≈ 1o ∨ 𝑥 ≈ 2o)})
66	10, 14, 18	s3cld 11529	. . . . . . . . . . . 12 ⊢ (⊤ → ⟨“{0, 1} {0, 2} {0, 3}”⟩ ∈ Word V)
67	66	mptru 1411	. . . . . . . . . . 11 ⊢ ⟨“{0, 1} {0, 2} {0, 3}”⟩ ∈ Word V
68	67	elexi 2834	. . . . . . . . . 10 ⊢ ⟨“{0, 1} {0, 2} {0, 3}”⟩ ∈ V
69	5, 68	opvtxfvi 16182	. . . . . . . . 9 ⊢ (Vtx‘⟨(0...3), ⟨“{0, 1} {0, 2} {0, 3}”⟩⟩) = (0...3)
70	69	eqcomi 2242	. . . . . . . 8 ⊢ (0...3) = (Vtx‘⟨(0...3), ⟨“{0, 1} {0, 2} {0, 3}”⟩⟩)
71	5, 68	opiedgfvi 16183	. . . . . . . . 9 ⊢ (iEdg‘⟨(0...3), ⟨“{0, 1} {0, 2} {0, 3}”⟩⟩) = ⟨“{0, 1} {0, 2} {0, 3}”⟩
72	71	eqcomi 2242	. . . . . . . 8 ⊢ ⟨“{0, 1} {0, 2} {0, 3}”⟩ = (iEdg‘⟨(0...3), ⟨“{0, 1} {0, 2} {0, 3}”⟩⟩)
73	21, 21, 24, 24	s4cld 11530	. . . . . . . . 9 ⊢ (⊤ → ⟨“{1, 2} {1, 2} {2, 3} {2, 3}”⟩ ∈ Word V)
74	10, 14, 18, 21, 21, 24, 24	s3s4d 11553	. . . . . . . . 9 ⊢ (⊤ → ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3} {2, 3}”⟩ = (⟨“{0, 1} {0, 2} {0, 3}”⟩ ++ ⟨“{1, 2} {1, 2} {2, 3} {2, 3}”⟩))
75	38, 39, 40	konigsbergssiedgwen 16641	. . . . . . . . 9 ⊢ ((⟨“{0, 1} {0, 2} {0, 3}”⟩ ∈ Word V ∧ ⟨“{1, 2} {1, 2} {2, 3} {2, 3}”⟩ ∈ Word V ∧ ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3} {2, 3}”⟩ = (⟨“{0, 1} {0, 2} {0, 3}”⟩ ++ ⟨“{1, 2} {1, 2} {2, 3} {2, 3}”⟩)) → ⟨“{0, 1} {0, 2} {0, 3}”⟩ ∈ Word {𝑥 ∈ 𝒫 (0...3) ∣ (𝑥 ≈ 1o ∨ 𝑥 ≈ 2o)})
76	66, 73, 74, 75	syl3anc 1278	. . . . . . . 8 ⊢ (⊤ → ⟨“{0, 1} {0, 2} {0, 3}”⟩ ∈ Word {𝑥 ∈ 𝒫 (0...3) ∣ (𝑥 ≈ 1o ∨ 𝑥 ≈ 2o)})
77	10, 14	s2cld 11528	. . . . . . . . . . . . . 14 ⊢ (⊤ → ⟨“{0, 1} {0, 2}”⟩ ∈ Word V)
78	77	mptru 1411	. . . . . . . . . . . . 13 ⊢ ⟨“{0, 1} {0, 2}”⟩ ∈ Word V
79	78	elexi 2834	. . . . . . . . . . . 12 ⊢ ⟨“{0, 1} {0, 2}”⟩ ∈ V
80	5, 79	opvtxfvi 16182	. . . . . . . . . . 11 ⊢ (Vtx‘⟨(0...3), ⟨“{0, 1} {0, 2}”⟩⟩) = (0...3)
81	80	eqcomi 2242	. . . . . . . . . 10 ⊢ (0...3) = (Vtx‘⟨(0...3), ⟨“{0, 1} {0, 2}”⟩⟩)
82	5, 79	opiedgfvi 16183	. . . . . . . . . . 11 ⊢ (iEdg‘⟨(0...3), ⟨“{0, 1} {0, 2}”⟩⟩) = ⟨“{0, 1} {0, 2}”⟩
83	82	eqcomi 2242	. . . . . . . . . 10 ⊢ ⟨“{0, 1} {0, 2}”⟩ = (iEdg‘⟨(0...3), ⟨“{0, 1} {0, 2}”⟩⟩)
84	18, 21, 21, 24, 24	s5cld 11531	. . . . . . . . . . 11 ⊢ (⊤ → ⟨“{0, 3} {1, 2} {1, 2} {2, 3} {2, 3}”⟩ ∈ Word V)
85	10, 14, 18, 21, 21, 24, 24	s2s5d 11554	. . . . . . . . . . 11 ⊢ (⊤ → ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3} {2, 3}”⟩ = (⟨“{0, 1} {0, 2}”⟩ ++ ⟨“{0, 3} {1, 2} {1, 2} {2, 3} {2, 3}”⟩))
86	38, 39, 40	konigsbergssiedgwen 16641	. . . . . . . . . . 11 ⊢ ((⟨“{0, 1} {0, 2}”⟩ ∈ Word V ∧ ⟨“{0, 3} {1, 2} {1, 2} {2, 3} {2, 3}”⟩ ∈ Word V ∧ ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3} {2, 3}”⟩ = (⟨“{0, 1} {0, 2}”⟩ ++ ⟨“{0, 3} {1, 2} {1, 2} {2, 3} {2, 3}”⟩)) → ⟨“{0, 1} {0, 2}”⟩ ∈ Word {𝑥 ∈ 𝒫 (0...3) ∣ (𝑥 ≈ 1o ∨ 𝑥 ≈ 2o)})
87	77, 84, 85, 86	syl3anc 1278	. . . . . . . . . 10 ⊢ (⊤ → ⟨“{0, 1} {0, 2}”⟩ ∈ Word {𝑥 ∈ 𝒫 (0...3) ∣ (𝑥 ≈ 1o ∨ 𝑥 ≈ 2o)})
88	10	s1cld 11368	. . . . . . . . . . . . . . 15 ⊢ (⊤ → ⟨“{0, 1}”⟩ ∈ Word V)
89	88	mptru 1411	. . . . . . . . . . . . . 14 ⊢ ⟨“{0, 1}”⟩ ∈ Word V
90	89	elexi 2834	. . . . . . . . . . . . 13 ⊢ ⟨“{0, 1}”⟩ ∈ V
91	5, 90	opvtxfvi 16182	. . . . . . . . . . . 12 ⊢ (Vtx‘⟨(0...3), ⟨“{0, 1}”⟩⟩) = (0...3)
92	91	eqcomi 2242	. . . . . . . . . . 11 ⊢ (0...3) = (Vtx‘⟨(0...3), ⟨“{0, 1}”⟩⟩)
93	5, 90	opiedgfvi 16183	. . . . . . . . . . . 12 ⊢ (iEdg‘⟨(0...3), ⟨“{0, 1}”⟩⟩) = ⟨“{0, 1}”⟩
94	93	eqcomi 2242	. . . . . . . . . . 11 ⊢ ⟨“{0, 1}”⟩ = (iEdg‘⟨(0...3), ⟨“{0, 1}”⟩⟩)
95	14, 18, 21, 21, 24, 24	s6cld 11532	. . . . . . . . . . . 12 ⊢ (⊤ → ⟨“{0, 2} {0, 3} {1, 2} {1, 2} {2, 3} {2, 3}”⟩ ∈ Word V)
96	10, 14, 18, 21, 21, 24, 24	s1s6d 11548	. . . . . . . . . . . 12 ⊢ (⊤ → ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3} {2, 3}”⟩ = (⟨“{0, 1}”⟩ ++ ⟨“{0, 2} {0, 3} {1, 2} {1, 2} {2, 3} {2, 3}”⟩))
97	38, 39, 40	konigsbergssiedgwen 16641	. . . . . . . . . . . 12 ⊢ ((⟨“{0, 1}”⟩ ∈ Word V ∧ ⟨“{0, 2} {0, 3} {1, 2} {1, 2} {2, 3} {2, 3}”⟩ ∈ Word V ∧ ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3} {2, 3}”⟩ = (⟨“{0, 1}”⟩ ++ ⟨“{0, 2} {0, 3} {1, 2} {1, 2} {2, 3} {2, 3}”⟩)) → ⟨“{0, 1}”⟩ ∈ Word {𝑥 ∈ 𝒫 (0...3) ∣ (𝑥 ≈ 1o ∨ 𝑥 ≈ 2o)})
98	88, 95, 96, 97	syl3anc 1278	. . . . . . . . . . 11 ⊢ (⊤ → ⟨“{0, 1}”⟩ ∈ Word {𝑥 ∈ 𝒫 (0...3) ∣ (𝑥 ≈ 1o ∨ 𝑥 ≈ 2o)})
99		0ex 4255	. . . . . . . . . . . . . 14 ⊢ ∅ ∈ V
100	5, 99	opvtxfvi 16182	. . . . . . . . . . . . 13 ⊢ (Vtx‘⟨(0...3), ∅⟩) = (0...3)
101	100	eqcomi 2242	. . . . . . . . . . . 12 ⊢ (0...3) = (Vtx‘⟨(0...3), ∅⟩)
102	5, 99	opiedgfvi 16183	. . . . . . . . . . . . 13 ⊢ (iEdg‘⟨(0...3), ∅⟩) = ∅
103	102	eqcomi 2242	. . . . . . . . . . . 12 ⊢ ∅ = (iEdg‘⟨(0...3), ∅⟩)
104		wrd0 11307	. . . . . . . . . . . . 13 ⊢ ∅ ∈ Word {𝑥 ∈ 𝒫 (0...3) ∣ (𝑥 ≈ 1o ∨ 𝑥 ≈ 2o)}
105	104	a1i 9	. . . . . . . . . . . 12 ⊢ (⊤ → ∅ ∈ Word {𝑥 ∈ 𝒫 (0...3) ∣ (𝑥 ≈ 1o ∨ 𝑥 ≈ 2o)})
106		eqidd 2239	. . . . . . . . . . . . 13 ⊢ (⊤ → ∅ = ∅)
107	4	a1i 9	. . . . . . . . . . . . 13 ⊢ (⊤ → (0...3) ∈ Fin)
108		upgr0eop 16277	. . . . . . . . . . . . . . 15 ⊢ ((0...3) ∈ Fin → ⟨(0...3), ∅⟩ ∈ UPGraph)
109	4, 108	ax-mp 5	. . . . . . . . . . . . . 14 ⊢ ⟨(0...3), ∅⟩ ∈ UPGraph
110	109	a1i 9	. . . . . . . . . . . . 13 ⊢ (⊤ → ⟨(0...3), ∅⟩ ∈ UPGraph)
111	101, 103, 32, 106, 107, 110	vtxdgfi0e 16450	. . . . . . . . . . . 12 ⊢ (⊤ → ((VtxDeg‘⟨(0...3), ∅⟩)‘3) = 0)
112	91	a1i 9	. . . . . . . . . . . 12 ⊢ (⊤ → (Vtx‘⟨(0...3), ⟨“{0, 1}”⟩⟩) = (0...3))
113		0elfz 10503	. . . . . . . . . . . . . 14 ⊢ (3 ∈ ℕ0 → 0 ∈ (0...3))
114	15, 113	ax-mp 5	. . . . . . . . . . . . 13 ⊢ 0 ∈ (0...3)
115	114	a1i 9	. . . . . . . . . . . 12 ⊢ (⊤ → 0 ∈ (0...3))
116		3ne0 9378	. . . . . . . . . . . . . 14 ⊢ 3 ≠ 0
117	116	necomi 2505	. . . . . . . . . . . . 13 ⊢ 0 ≠ 3
118	117	a1i 9	. . . . . . . . . . . 12 ⊢ (⊤ → 0 ≠ 3)
119		1le3 9495	. . . . . . . . . . . . . 14 ⊢ 1 ≤ 3
120		elfz2nn0 10497	. . . . . . . . . . . . . 14 ⊢ (1 ∈ (0...3) ↔ (1 ∈ ℕ0 ∧ 3 ∈ ℕ0 ∧ 1 ≤ 3))
121	7, 15, 119, 120	mpbir3an 1210	. . . . . . . . . . . . 13 ⊢ 1 ∈ (0...3)
122	121	a1i 9	. . . . . . . . . . . 12 ⊢ (⊤ → 1 ∈ (0...3))
123		1re 8315	. . . . . . . . . . . . . 14 ⊢ 1 ∈ ℝ
124		1lt3 9455	. . . . . . . . . . . . . 14 ⊢ 1 < 3
125	123, 124	ltneii 8412	. . . . . . . . . . . . 13 ⊢ 1 ≠ 3
126	125	a1i 9	. . . . . . . . . . . 12 ⊢ (⊤ → 1 ≠ 3)
127		0ne1 9350	. . . . . . . . . . . . 13 ⊢ 0 ≠ 1
128	127	a1i 9	. . . . . . . . . . . 12 ⊢ (⊤ → 0 ≠ 1)
129		s1cl 11367	. . . . . . . . . . . . . . . . 17 ⊢ ({0, 1} ∈ V → ⟨“{0, 1}”⟩ ∈ Word V)
130	9, 129	ax-mp 5	. . . . . . . . . . . . . . . 16 ⊢ ⟨“{0, 1}”⟩ ∈ Word V
131		ccatlid 11352	. . . . . . . . . . . . . . . 16 ⊢ (⟨“{0, 1}”⟩ ∈ Word V → (∅ ++ ⟨“{0, 1}”⟩) = ⟨“{0, 1}”⟩)
132	130, 131	ax-mp 5	. . . . . . . . . . . . . . 15 ⊢ (∅ ++ ⟨“{0, 1}”⟩) = ⟨“{0, 1}”⟩
133	132	eqcomi 2242	. . . . . . . . . . . . . 14 ⊢ ⟨“{0, 1}”⟩ = (∅ ++ ⟨“{0, 1}”⟩)
134	93, 133	eqtri 2259	. . . . . . . . . . . . 13 ⊢ (iEdg‘⟨(0...3), ⟨“{0, 1}”⟩⟩) = (∅ ++ ⟨“{0, 1}”⟩)
135	134	a1i 9	. . . . . . . . . . . 12 ⊢ (⊤ → (iEdg‘⟨(0...3), ⟨“{0, 1}”⟩⟩) = (∅ ++ ⟨“{0, 1}”⟩))
136	101, 32, 103, 105, 111, 112, 107, 115, 118, 122, 126, 128, 135	vdegp1aid 16469	. . . . . . . . . . 11 ⊢ (⊤ → ((VtxDeg‘⟨(0...3), ⟨“{0, 1}”⟩⟩)‘3) = 0)
137	80	a1i 9	. . . . . . . . . . 11 ⊢ (⊤ → (Vtx‘⟨(0...3), ⟨“{0, 1} {0, 2}”⟩⟩) = (0...3))
138		2re 9353	. . . . . . . . . . . . . 14 ⊢ 2 ∈ ℝ
139		3re 9357	. . . . . . . . . . . . . 14 ⊢ 3 ∈ ℝ
140		2lt3 9454	. . . . . . . . . . . . . 14 ⊢ 2 < 3
141	138, 139, 140	ltleii 8418	. . . . . . . . . . . . 13 ⊢ 2 ≤ 3
142		elfz2nn0 10497	. . . . . . . . . . . . 13 ⊢ (2 ∈ (0...3) ↔ (2 ∈ ℕ0 ∧ 3 ∈ ℕ0 ∧ 2 ≤ 3))
143	11, 15, 141, 142	mpbir3an 1210	. . . . . . . . . . . 12 ⊢ 2 ∈ (0...3)
144	143	a1i 9	. . . . . . . . . . 11 ⊢ (⊤ → 2 ∈ (0...3))
145	138, 140	ltneii 8412	. . . . . . . . . . . 12 ⊢ 2 ≠ 3
146	145	a1i 9	. . . . . . . . . . 11 ⊢ (⊤ → 2 ≠ 3)
147		0ne2 9489	. . . . . . . . . . . 12 ⊢ 0 ≠ 2
148	147	a1i 9	. . . . . . . . . . 11 ⊢ (⊤ → 0 ≠ 2)
149		df-s2 11506	. . . . . . . . . . . . 13 ⊢ ⟨“{0, 1} {0, 2}”⟩ = (⟨“{0, 1}”⟩ ++ ⟨“{0, 2}”⟩)
150	82, 149	eqtri 2259	. . . . . . . . . . . 12 ⊢ (iEdg‘⟨(0...3), ⟨“{0, 1} {0, 2}”⟩⟩) = (⟨“{0, 1}”⟩ ++ ⟨“{0, 2}”⟩)
151	150	a1i 9	. . . . . . . . . . 11 ⊢ (⊤ → (iEdg‘⟨(0...3), ⟨“{0, 1} {0, 2}”⟩⟩) = (⟨“{0, 1}”⟩ ++ ⟨“{0, 2}”⟩))
152	92, 32, 94, 98, 136, 137, 107, 115, 118, 144, 146, 148, 151	vdegp1aid 16469	. . . . . . . . . 10 ⊢ (⊤ → ((VtxDeg‘⟨(0...3), ⟨“{0, 1} {0, 2}”⟩⟩)‘3) = 0)
153	69	a1i 9	. . . . . . . . . 10 ⊢ (⊤ → (Vtx‘⟨(0...3), ⟨“{0, 1} {0, 2} {0, 3}”⟩⟩) = (0...3))
154		df-s3 11507	. . . . . . . . . . . 12 ⊢ ⟨“{0, 1} {0, 2} {0, 3}”⟩ = (⟨“{0, 1} {0, 2}”⟩ ++ ⟨“{0, 3}”⟩)
155	71, 154	eqtri 2259	. . . . . . . . . . 11 ⊢ (iEdg‘⟨(0...3), ⟨“{0, 1} {0, 2} {0, 3}”⟩⟩) = (⟨“{0, 1} {0, 2}”⟩ ++ ⟨“{0, 3}”⟩)
156	155	a1i 9	. . . . . . . . . 10 ⊢ (⊤ → (iEdg‘⟨(0...3), ⟨“{0, 1} {0, 2} {0, 3}”⟩⟩) = (⟨“{0, 1} {0, 2}”⟩ ++ ⟨“{0, 3}”⟩))
157	81, 32, 83, 87, 152, 153, 107, 115, 118, 156	vdegp1cid 16471	. . . . . . . . 9 ⊢ (⊤ → ((VtxDeg‘⟨(0...3), ⟨“{0, 1} {0, 2} {0, 3}”⟩⟩)‘3) = (0 + 1))
158		0p1e1 9397	. . . . . . . . 9 ⊢ (0 + 1) = 1
159	157, 158	eqtrdi 2287	. . . . . . . 8 ⊢ (⊤ → ((VtxDeg‘⟨(0...3), ⟨“{0, 1} {0, 2} {0, 3}”⟩⟩)‘3) = 1)
160	58	a1i 9	. . . . . . . 8 ⊢ (⊤ → (Vtx‘⟨(0...3), ⟨“{0, 1} {0, 2} {0, 3} {1, 2}”⟩⟩) = (0...3))
161		1ne2 9490	. . . . . . . . 9 ⊢ 1 ≠ 2
162	161	a1i 9	. . . . . . . 8 ⊢ (⊤ → 1 ≠ 2)
163		df-s4 11508	. . . . . . . . . 10 ⊢ ⟨“{0, 1} {0, 2} {0, 3} {1, 2}”⟩ = (⟨“{0, 1} {0, 2} {0, 3}”⟩ ++ ⟨“{1, 2}”⟩)
164	60, 163	eqtri 2259	. . . . . . . . 9 ⊢ (iEdg‘⟨(0...3), ⟨“{0, 1} {0, 2} {0, 3} {1, 2}”⟩⟩) = (⟨“{0, 1} {0, 2} {0, 3}”⟩ ++ ⟨“{1, 2}”⟩)
165	164	a1i 9	. . . . . . . 8 ⊢ (⊤ → (iEdg‘⟨(0...3), ⟨“{0, 1} {0, 2} {0, 3} {1, 2}”⟩⟩) = (⟨“{0, 1} {0, 2} {0, 3}”⟩ ++ ⟨“{1, 2}”⟩))
166	70, 32, 72, 76, 159, 160, 107, 122, 126, 144, 146, 162, 165	vdegp1aid 16469	. . . . . . 7 ⊢ (⊤ → ((VtxDeg‘⟨(0...3), ⟨“{0, 1} {0, 2} {0, 3} {1, 2}”⟩⟩)‘3) = 1)
167	47	a1i 9	. . . . . . 7 ⊢ (⊤ → (Vtx‘⟨(0...3), ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2}”⟩⟩) = (0...3))
168		df-s5 11509	. . . . . . . . 9 ⊢ ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2}”⟩ = (⟨“{0, 1} {0, 2} {0, 3} {1, 2}”⟩ ++ ⟨“{1, 2}”⟩)
169	49, 168	eqtri 2259	. . . . . . . 8 ⊢ (iEdg‘⟨(0...3), ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2}”⟩⟩) = (⟨“{0, 1} {0, 2} {0, 3} {1, 2}”⟩ ++ ⟨“{1, 2}”⟩)
170	169	a1i 9	. . . . . . 7 ⊢ (⊤ → (iEdg‘⟨(0...3), ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2}”⟩⟩) = (⟨“{0, 1} {0, 2} {0, 3} {1, 2}”⟩ ++ ⟨“{1, 2}”⟩))
171	59, 32, 61, 65, 166, 167, 107, 122, 126, 144, 146, 162, 170	vdegp1aid 16469	. . . . . 6 ⊢ (⊤ → ((VtxDeg‘⟨(0...3), ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2}”⟩⟩)‘3) = 1)
172	28	a1i 9	. . . . . 6 ⊢ (⊤ → (Vtx‘⟨(0...3), ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3}”⟩⟩) = (0...3))
173		df-s6 11510	. . . . . . . 8 ⊢ ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3}”⟩ = (⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2}”⟩ ++ ⟨“{2, 3}”⟩)
174	33, 173	eqtri 2259	. . . . . . 7 ⊢ (iEdg‘⟨(0...3), ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3}”⟩⟩) = (⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2}”⟩ ++ ⟨“{2, 3}”⟩)
175	174	a1i 9	. . . . . 6 ⊢ (⊤ → (iEdg‘⟨(0...3), ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3}”⟩⟩) = (⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2}”⟩ ++ ⟨“{2, 3}”⟩))
176	48, 32, 50, 54, 171, 172, 107, 144, 146, 175	vdegp1cid 16471	. . . . 5 ⊢ (⊤ → ((VtxDeg‘⟨(0...3), ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3}”⟩⟩)‘3) = (1 + 1))
177		1p1e2 9400	. . . . 5 ⊢ (1 + 1) = 2
178	176, 177	eqtrdi 2287	. . . 4 ⊢ (⊤ → ((VtxDeg‘⟨(0...3), ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3}”⟩⟩)‘3) = 2)
179		konigsberg.v	. . . . . 6 ⊢ 𝑉 = (0...3)
180		konigsberg.e	. . . . . 6 ⊢ 𝐸 = ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3} {2, 3}”⟩
181		konigsberg.g	. . . . . 6 ⊢ 𝐺 = ⟨𝑉, 𝐸⟩
182	179, 180, 181	konigsbergvtx 16637	. . . . 5 ⊢ (Vtx‘𝐺) = (0...3)
183	182	a1i 9	. . . 4 ⊢ (⊤ → (Vtx‘𝐺) = (0...3))
184	179, 180, 181	konigsbergiedg 16638	. . . . . 6 ⊢ (iEdg‘𝐺) = ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3} {2, 3}”⟩
185	184, 37	eqtri 2259	. . . . 5 ⊢ (iEdg‘𝐺) = (⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3}”⟩ ++ ⟨“{2, 3}”⟩)
186	185	a1i 9	. . . 4 ⊢ (⊤ → (iEdg‘𝐺) = (⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3}”⟩ ++ ⟨“{2, 3}”⟩))
187	29, 32, 34, 43, 178, 183, 107, 144, 146, 186	vdegp1cid 16471	. . 3 ⊢ (⊤ → ((VtxDeg‘𝐺)‘3) = (2 + 1))
188	187	mptru 1411	. 2 ⊢ ((VtxDeg‘𝐺)‘3) = (2 + 1)
189		2p1e3 9417	. 2 ⊢ (2 + 1) = 3
190	188, 189	eqtri 2259	1 ⊢ ((VtxDeg‘𝐺)‘3) = 3

Syntax hints:   ∨ wo 720   = wceq 1402  ⊤wtru 1403   ∈ wcel 2209   ≠ wne 2420  {crab 2532  Vcvv 2821  ∅c0 3520  𝒫 cpw 3685  {cpr 3706  ⟨cop 3708   class class class wbr 4125  ‘cfv 5372  (class class class)co 6075  1_oc1o 6670  2_oc2o 6671   ≈ cen 7010  Fincfn 7012  0cc0 8169  1c1 8170   + caddc 8172   ≤ cle 8351  2c2 9334  3c3 9335  ℕ₀cn0 9542  ℤcz 9623  ...cfz 10390  Word cword 11282   ++ cconcat 11336  ⟨“cs1 11361  ⟨“cs2 11499  ⟨“cs3 11500  ⟨“cs4 11501  ⟨“cs5 11502  ⟨“cs6 11503  ⟨“cs7 11504  Vtxcvtx 16167  iEdgciedg 16168  UPGraphcupgr 16246  VtxDegcvtxdg 16441

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-coll 4241  ax-sep 4244  ax-nul 4254  ax-pow 4306  ax-pr 4341  ax-un 4573  ax-setind 4679  ax-iinf 4730  ax-cnex 8260  ax-resscn 8261  ax-1cn 8262  ax-1re 8263  ax-icn 8264  ax-addcl 8265  ax-addrcl 8266  ax-mulcl 8267  ax-addcom 8269  ax-mulcom 8270  ax-addass 8271  ax-mulass 8272  ax-distr 8273  ax-i2m1 8274  ax-0lt1 8275  ax-1rid 8276  ax-0id 8277  ax-rnegex 8278  ax-cnre 8280  ax-pre-ltirr 8281  ax-pre-ltwlin 8282  ax-pre-lttrn 8283  ax-pre-apti 8284  ax-pre-ltadd 8285

This theorem depends on definitions:  df-bi 117  df-dc 847  df-3or 1010  df-3an 1011  df-tru 1405  df-fal 1408  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-nel 2516  df-ral 2533  df-rex 2534  df-reu 2535  df-rab 2537  df-v 2823  df-sbc 3052  df-csb 3148  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-nul 3521  df-if 3636  df-pw 3687  df-sn 3711  df-pr 3712  df-op 3714  df-uni 3931  df-int 3966  df-iun 4009  df-br 4126  df-opab 4188  df-mpt 4189  df-tr 4225  df-id 4433  df-iord 4506  df-on 4508  df-ilim 4509  df-suc 4511  df-iom 4733  df-xp 4775  df-rel 4776  df-cnv 4777  df-co 4778  df-dm 4779  df-rn 4780  df-res 4781  df-ima 4782  df-iota 5332  df-fun 5374  df-fn 5375  df-f 5376  df-f1 5377  df-fo 5378  df-f1o 5379  df-fv 5380  df-riota 6028  df-ov 6078  df-oprab 6079  df-mpo 6080  df-1st 6364  df-2nd 6365  df-recs 6566  df-irdg 6631  df-frec 6652  df-1o 6677  df-2o 6678  df-oadd 6681  df-er 6797  df-en 7013  df-dom 7014  df-fin 7015  df-pnf 8352  df-mnf 8353  df-xr 8354  df-ltxr 8355  df-le 8356  df-sub 8489  df-neg 8490  df-inn 9284  df-2 9342  df-3 9343  df-4 9344  df-5 9345  df-6 9346  df-7 9347  df-8 9348  df-9 9349  df-n0 9543  df-z 9624  df-dec 9757  df-uz 9901  df-xadd 10154  df-fz 10391  df-fzo 10528  df-ihash 11193  df-word 11283  df-concat 11337  df-s1 11362  df-s2 11506  df-s3 11507  df-s4 11508  df-s5 11509  df-s6 11510  df-s7 11511  df-ndx 13333  df-slot 13334  df-base 13336  df-edgf 16160  df-vtx 16169  df-iedg 16170  df-upgren 16248  df-umgren 16249  df-vtxdg 16442

This theorem is referenced by:  konigsberglem4  16646