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Theorem konigsberglem4 16830

Description: Lemma 4 for konigsberg 16832: Vertices 0, 1, 3 are vertices of odd degree. (Contributed by Mario Carneiro, 11-Mar-2015.) (Revised by AV, 28-Feb-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
konigsberglem4	⊢ {0, 1, 3} ⊆ {𝑥 ∈ 𝑉 ∣ ¬ 2 ∥ ((VtxDeg‘𝐺)‘𝑥)}

Distinct variable groups: 𝑥,𝑉 𝑥,𝐺 Allowed substitution hint: 𝐸(𝑥)

**Proof of Theorem konigsberglem4**
Step	Hyp	Ref	Expression
1		3nn0 9585	. . . . . 6 ⊢ 3 ∈ ℕ₀
2		0elfz 10535	. . . . . 6 ⊢ (3 ∈ ℕ₀ → 0 ∈ (0...3))
3	1, 2	ax-mp 5	. . . . 5 ⊢ 0 ∈ (0...3)
4		konigsberg.v	. . . . 5 ⊢ 𝑉 = (0...3)
5	3, 4	eleqtrri 2314	. . . 4 ⊢ 0 ∈ 𝑉
6		n2dvds3 12698	. . . . 5 ⊢ ¬ 2 ∥ 3
7		konigsberg.e	. . . . . . 7 ⊢ 𝐸 = ⟨“{0, 1} {0, 2} {0, 3} {1, 2} {1, 2} {2, 3} {2, 3}”⟩
8		konigsberg.g	. . . . . . 7 ⊢ 𝐺 = ⟨𝑉, 𝐸⟩
9	4, 7, 8	konigsberglem1 16827	. . . . . 6 ⊢ ((VtxDeg‘𝐺)‘0) = 3
10	9	breq2i 4138	. . . . 5 ⊢ (2 ∥ ((VtxDeg‘𝐺)‘0) ↔ 2 ∥ 3)
11	6, 10	mtbir 682	. . . 4 ⊢ ¬ 2 ∥ ((VtxDeg‘𝐺)‘0)
12		fveq2 5695	. . . . . . 7 ⊢ (𝑥 = 0 → ((VtxDeg‘𝐺)‘𝑥) = ((VtxDeg‘𝐺)‘0))
13	12	breq2d 4142	. . . . . 6 ⊢ (𝑥 = 0 → (2 ∥ ((VtxDeg‘𝐺)‘𝑥) ↔ 2 ∥ ((VtxDeg‘𝐺)‘0)))
14	13	notbid 677	. . . . 5 ⊢ (𝑥 = 0 → (¬ 2 ∥ ((VtxDeg‘𝐺)‘𝑥) ↔ ¬ 2 ∥ ((VtxDeg‘𝐺)‘0)))
15	14	elrab 2982	. . . 4 ⊢ (0 ∈ {𝑥 ∈ 𝑉 ∣ ¬ 2 ∥ ((VtxDeg‘𝐺)‘𝑥)} ↔ (0 ∈ 𝑉 ∧ ¬ 2 ∥ ((VtxDeg‘𝐺)‘0)))
16	5, 11, 15	mpbir2an 955	. . 3 ⊢ 0 ∈ {𝑥 ∈ 𝑉 ∣ ¬ 2 ∥ ((VtxDeg‘𝐺)‘𝑥)}
17		1nn0 9583	. . . . . 6 ⊢ 1 ∈ ℕ₀
18		1le3 9520	. . . . . 6 ⊢ 1 ≤ 3
19		elfz2nn0 10529	. . . . . 6 ⊢ (1 ∈ (0...3) ↔ (1 ∈ ℕ₀ ∧ 3 ∈ ℕ₀ ∧ 1 ≤ 3))
20	17, 1, 18, 19	mpbir3an 1210	. . . . 5 ⊢ 1 ∈ (0...3)
21	20, 4	eleqtrri 2314	. . . 4 ⊢ 1 ∈ 𝑉
22	4, 7, 8	konigsberglem2 16828	. . . . . 6 ⊢ ((VtxDeg‘𝐺)‘1) = 3
23	22	breq2i 4138	. . . . 5 ⊢ (2 ∥ ((VtxDeg‘𝐺)‘1) ↔ 2 ∥ 3)
24	6, 23	mtbir 682	. . . 4 ⊢ ¬ 2 ∥ ((VtxDeg‘𝐺)‘1)
25		fveq2 5695	. . . . . . 7 ⊢ (𝑥 = 1 → ((VtxDeg‘𝐺)‘𝑥) = ((VtxDeg‘𝐺)‘1))
26	25	breq2d 4142	. . . . . 6 ⊢ (𝑥 = 1 → (2 ∥ ((VtxDeg‘𝐺)‘𝑥) ↔ 2 ∥ ((VtxDeg‘𝐺)‘1)))
27	26	notbid 677	. . . . 5 ⊢ (𝑥 = 1 → (¬ 2 ∥ ((VtxDeg‘𝐺)‘𝑥) ↔ ¬ 2 ∥ ((VtxDeg‘𝐺)‘1)))
28	27	elrab 2982	. . . 4 ⊢ (1 ∈ {𝑥 ∈ 𝑉 ∣ ¬ 2 ∥ ((VtxDeg‘𝐺)‘𝑥)} ↔ (1 ∈ 𝑉 ∧ ¬ 2 ∥ ((VtxDeg‘𝐺)‘1)))
29	21, 24, 28	mpbir2an 955	. . 3 ⊢ 1 ∈ {𝑥 ∈ 𝑉 ∣ ¬ 2 ∥ ((VtxDeg‘𝐺)‘𝑥)}
30		3re 9380	. . . . . . 7 ⊢ 3 ∈ ℝ
31	30	leidi 8814	. . . . . 6 ⊢ 3 ≤ 3
32		elfz2nn0 10529	. . . . . 6 ⊢ (3 ∈ (0...3) ↔ (3 ∈ ℕ₀ ∧ 3 ∈ ℕ₀ ∧ 3 ≤ 3))
33	1, 1, 31, 32	mpbir3an 1210	. . . . 5 ⊢ 3 ∈ (0...3)
34	33, 4	eleqtrri 2314	. . . 4 ⊢ 3 ∈ 𝑉
35	4, 7, 8	konigsberglem3 16829	. . . . . 6 ⊢ ((VtxDeg‘𝐺)‘3) = 3
36	35	breq2i 4138	. . . . 5 ⊢ (2 ∥ ((VtxDeg‘𝐺)‘3) ↔ 2 ∥ 3)
37	6, 36	mtbir 682	. . . 4 ⊢ ¬ 2 ∥ ((VtxDeg‘𝐺)‘3)
38		fveq2 5695	. . . . . . 7 ⊢ (𝑥 = 3 → ((VtxDeg‘𝐺)‘𝑥) = ((VtxDeg‘𝐺)‘3))
39	38	breq2d 4142	. . . . . 6 ⊢ (𝑥 = 3 → (2 ∥ ((VtxDeg‘𝐺)‘𝑥) ↔ 2 ∥ ((VtxDeg‘𝐺)‘3)))
40	39	notbid 677	. . . . 5 ⊢ (𝑥 = 3 → (¬ 2 ∥ ((VtxDeg‘𝐺)‘𝑥) ↔ ¬ 2 ∥ ((VtxDeg‘𝐺)‘3)))
41	40	elrab 2982	. . . 4 ⊢ (3 ∈ {𝑥 ∈ 𝑉 ∣ ¬ 2 ∥ ((VtxDeg‘𝐺)‘𝑥)} ↔ (3 ∈ 𝑉 ∧ ¬ 2 ∥ ((VtxDeg‘𝐺)‘3)))
42	34, 37, 41	mpbir2an 955	. . 3 ⊢ 3 ∈ {𝑥 ∈ 𝑉 ∣ ¬ 2 ∥ ((VtxDeg‘𝐺)‘𝑥)}
43	16, 29, 42	3pm3.2i 1206	. 2 ⊢ (0 ∈ {𝑥 ∈ 𝑉 ∣ ¬ 2 ∥ ((VtxDeg‘𝐺)‘𝑥)} ∧ 1 ∈ {𝑥 ∈ 𝑉 ∣ ¬ 2 ∥ ((VtxDeg‘𝐺)‘𝑥)} ∧ 3 ∈ {𝑥 ∈ 𝑉 ∣ ¬ 2 ∥ ((VtxDeg‘𝐺)‘𝑥)})
44		c0ex 8320	. . 3 ⊢ 0 ∈ V
45		1ex 8321	. . 3 ⊢ 1 ∈ V
46		3ex 9382	. . 3 ⊢ 3 ∈ V
47	44, 45, 46	tpss 3883	. 2 ⊢ ((0 ∈ {𝑥 ∈ 𝑉 ∣ ¬ 2 ∥ ((VtxDeg‘𝐺)‘𝑥)} ∧ 1 ∈ {𝑥 ∈ 𝑉 ∣ ¬ 2 ∥ ((VtxDeg‘𝐺)‘𝑥)} ∧ 3 ∈ {𝑥 ∈ 𝑉 ∣ ¬ 2 ∥ ((VtxDeg‘𝐺)‘𝑥)}) ↔ {0, 1, 3} ⊆ {𝑥 ∈ 𝑉 ∣ ¬ 2 ∥ ((VtxDeg‘𝐺)‘𝑥)})
48	43, 47	mpbi 145	1 ⊢ {0, 1, 3} ⊆ {𝑥 ∈ 𝑉 ∣ ¬ 2 ∥ ((VtxDeg‘𝐺)‘𝑥)}

Colors of variables: wff set class

This proof depends on syntax axioms: ¬ wn 3 ∧ w3a 1009 = wceq 1402 ∈ wcel 2209 {crab 2532 ⊆ wss 3220 {cpr 3710 {ctp 3711 ⟨cop 3712 class class class wbr 4130 ‘cfv 5377 (class class class)co 6085 0cc0 8179 1c1 8180 ≤ cle 8361 2c2 9357 3c3 9358 ℕ₀cn0 9567 ...cfz 10421 ⟨“cs7 11540 ∥ cdvds 12570 VtxDegcvtxdg 16625

This proof depends on 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 4246 ax-sep 4249 ax-nul 4259 ax-pow 4311 ax-pr 4346 ax-un 4578 ax-setind 4684 ax-iinf 4735 ax-cnex 8270 ax-resscn 8271 ax-1cn 8272 ax-1re 8273 ax-icn 8274 ax-addcl 8275 ax-addrcl 8276 ax-mulcl 8277 ax-mulrcl 8278 ax-addcom 8279 ax-mulcom 8280 ax-addass 8281 ax-mulass 8282 ax-distr 8283 ax-i2m1 8284 ax-0lt1 8285 ax-1rid 8286 ax-0id 8287 ax-rnegex 8288 ax-precex 8289 ax-cnre 8290 ax-pre-ltirr 8291 ax-pre-ltwlin 8292 ax-pre-lttrn 8293 ax-pre-apti 8294 ax-pre-ltadd 8295 ax-pre-mulgt0 8296 ax-pre-mulext 8297

This proof depends on definitions: df-bi 117 df-dc 847 df-3or 1010 df-3an 1011 df-tru 1405 df-fal 1408 df-xor 1425 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-rmo 2536 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 3639 df-pw 3690 df-sn 3715 df-pr 3716 df-tp 3717 df-op 3718 df-uni 3936 df-int 3971 df-iun 4014 df-br 4131 df-opab 4193 df-mpt 4194 df-tr 4230 df-id 4438 df-po 4441 df-iso 4442 df-iord 4511 df-on 4513 df-ilim 4514 df-suc 4516 df-iom 4738 df-xp 4780 df-rel 4781 df-cnv 4782 df-co 4783 df-dm 4784 df-rn 4785 df-res 4786 df-ima 4787 df-iota 5337 df-fun 5379 df-fn 5380 df-f 5381 df-f1 5382 df-fo 5383 df-f1o 5384 df-fv 5385 df-riota 6038 df-ov 6088 df-oprab 6089 df-mpo 6090 df-1st 6374 df-2nd 6375 df-recs 6576 df-irdg 6641 df-frec 6662 df-1o 6687 df-2o 6688 df-oadd 6691 df-er 6807 df-en 7023 df-dom 7024 df-fin 7025 df-pnf 8362 df-mnf 8363 df-xr 8364 df-ltxr 8365 df-le 8366 df-sub 8500 df-neg 8501 df-reap 8905 df-ap 8912 df-div 9005 df-inn 9307 df-2 9365 df-3 9366 df-4 9367 df-5 9368 df-6 9369 df-7 9370 df-8 9371 df-9 9372 df-n0 9568 df-z 9649 df-dec 9782 df-uz 9931 df-xadd 10185 df-fz 10422 df-fzo 10560 df-ihash 11229 df-word 11319 df-concat 11373 df-s1 11398 df-s2 11542 df-s3 11543 df-s4 11544 df-s5 11545 df-s6 11546 df-s7 11547 df-dvds 12571 df-ndx 13404 df-slot 13405 df-base 13407 df-edgf 16344 df-vtx 16353 df-iedg 16354 df-upgren 16432 df-umgren 16433 df-vtxdg 16626

This theorem is used by: konigsberglem5 16831

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