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Theorem cusgrfilem1 29524

Description: Lemma 1 for cusgrfi 29527. (Contributed by Alexander van der Vekens, 13-Jan-2018.) (Revised by AV, 11-Nov-2020.)

**Hypotheses**
Ref	Expression
cusgrfi.v	⊢ 𝑉 = (Vtx‘𝐺)
cusgrfi.p	⊢ 𝑃 = {𝑥 ∈ 𝒫 𝑉 ∣ ∃𝑎 ∈ 𝑉 (𝑎 ≠ 𝑁 ∧ 𝑥 = {𝑎, 𝑁})}

**Assertion**
Ref	Expression
cusgrfilem1	⊢ ((𝐺 ∈ ComplUSGraph ∧ 𝑁 ∈ 𝑉) → 𝑃 ⊆ (Edg‘𝐺))

Distinct variable groups: 𝑥,𝐺 𝑁,𝑎,𝑥 𝑉,𝑎,𝑥 Allowed substitution hints: 𝑃(𝑥,𝑎) 𝐺(𝑎)

**Proof of Theorem cusgrfilem1**
Step	Hyp	Ref	Expression
1		cusgrfi.v	. . . 4 ⊢ 𝑉 = (Vtx‘𝐺)
2		eqid 2737	. . . 4 ⊢ (Edg‘𝐺) = (Edg‘𝐺)
3	1, 2	cusgredg 29493	. . 3 ⊢ (𝐺 ∈ ComplUSGraph → (Edg‘𝐺) = {𝑥 ∈ 𝒫 𝑉 ∣ (♯‘𝑥) = 2})
4		fveq2 6841	. . . . . . . . 9 ⊢ (𝑥 = {𝑎, 𝑁} → (♯‘𝑥) = (♯‘{𝑎, 𝑁}))
5	4	ad2antlr 728	. . . . . . . 8 ⊢ (((𝑎 ≠ 𝑁 ∧ 𝑥 = {𝑎, 𝑁}) ∧ (𝑎 ∈ 𝑉 ∧ (𝑁 ∈ 𝑉 ∧ 𝑥 ∈ 𝒫 𝑉))) → (♯‘𝑥) = (♯‘{𝑎, 𝑁}))
6		hashprg 14357	. . . . . . . . . . . 12 ⊢ ((𝑎 ∈ 𝑉 ∧ 𝑁 ∈ 𝑉) → (𝑎 ≠ 𝑁 ↔ (♯‘{𝑎, 𝑁}) = 2))
7	6	adantrr 718	. . . . . . . . . . 11 ⊢ ((𝑎 ∈ 𝑉 ∧ (𝑁 ∈ 𝑉 ∧ 𝑥 ∈ 𝒫 𝑉)) → (𝑎 ≠ 𝑁 ↔ (♯‘{𝑎, 𝑁}) = 2))
8	7	biimpcd 249	. . . . . . . . . 10 ⊢ (𝑎 ≠ 𝑁 → ((𝑎 ∈ 𝑉 ∧ (𝑁 ∈ 𝑉 ∧ 𝑥 ∈ 𝒫 𝑉)) → (♯‘{𝑎, 𝑁}) = 2))
9	8	adantr 480	. . . . . . . . 9 ⊢ ((𝑎 ≠ 𝑁 ∧ 𝑥 = {𝑎, 𝑁}) → ((𝑎 ∈ 𝑉 ∧ (𝑁 ∈ 𝑉 ∧ 𝑥 ∈ 𝒫 𝑉)) → (♯‘{𝑎, 𝑁}) = 2))
10	9	imp 406	. . . . . . . 8 ⊢ (((𝑎 ≠ 𝑁 ∧ 𝑥 = {𝑎, 𝑁}) ∧ (𝑎 ∈ 𝑉 ∧ (𝑁 ∈ 𝑉 ∧ 𝑥 ∈ 𝒫 𝑉))) → (♯‘{𝑎, 𝑁}) = 2)
11	5, 10	eqtrd 2772	. . . . . . 7 ⊢ (((𝑎 ≠ 𝑁 ∧ 𝑥 = {𝑎, 𝑁}) ∧ (𝑎 ∈ 𝑉 ∧ (𝑁 ∈ 𝑉 ∧ 𝑥 ∈ 𝒫 𝑉))) → (♯‘𝑥) = 2)
12	11	an13s 652	. . . . . 6 ⊢ (((𝑁 ∈ 𝑉 ∧ 𝑥 ∈ 𝒫 𝑉) ∧ (𝑎 ∈ 𝑉 ∧ (𝑎 ≠ 𝑁 ∧ 𝑥 = {𝑎, 𝑁}))) → (♯‘𝑥) = 2)
13	12	rexlimdvaa 3140	. . . . 5 ⊢ ((𝑁 ∈ 𝑉 ∧ 𝑥 ∈ 𝒫 𝑉) → (∃𝑎 ∈ 𝑉 (𝑎 ≠ 𝑁 ∧ 𝑥 = {𝑎, 𝑁}) → (♯‘𝑥) = 2))
14	13	ss2rabdv 4016	. . . 4 ⊢ (𝑁 ∈ 𝑉 → {𝑥 ∈ 𝒫 𝑉 ∣ ∃𝑎 ∈ 𝑉 (𝑎 ≠ 𝑁 ∧ 𝑥 = {𝑎, 𝑁})} ⊆ {𝑥 ∈ 𝒫 𝑉 ∣ (♯‘𝑥) = 2})
15		cusgrfi.p	. . . . . 6 ⊢ 𝑃 = {𝑥 ∈ 𝒫 𝑉 ∣ ∃𝑎 ∈ 𝑉 (𝑎 ≠ 𝑁 ∧ 𝑥 = {𝑎, 𝑁})}
16	15	a1i 11	. . . . 5 ⊢ ((Edg‘𝐺) = {𝑥 ∈ 𝒫 𝑉 ∣ (♯‘𝑥) = 2} → 𝑃 = {𝑥 ∈ 𝒫 𝑉 ∣ ∃𝑎 ∈ 𝑉 (𝑎 ≠ 𝑁 ∧ 𝑥 = {𝑎, 𝑁})})
17		id 22	. . . . 5 ⊢ ((Edg‘𝐺) = {𝑥 ∈ 𝒫 𝑉 ∣ (♯‘𝑥) = 2} → (Edg‘𝐺) = {𝑥 ∈ 𝒫 𝑉 ∣ (♯‘𝑥) = 2})
18	16, 17	sseq12d 3956	. . . 4 ⊢ ((Edg‘𝐺) = {𝑥 ∈ 𝒫 𝑉 ∣ (♯‘𝑥) = 2} → (𝑃 ⊆ (Edg‘𝐺) ↔ {𝑥 ∈ 𝒫 𝑉 ∣ ∃𝑎 ∈ 𝑉 (𝑎 ≠ 𝑁 ∧ 𝑥 = {𝑎, 𝑁})} ⊆ {𝑥 ∈ 𝒫 𝑉 ∣ (♯‘𝑥) = 2}))
19	14, 18	imbitrrid 246	. . 3 ⊢ ((Edg‘𝐺) = {𝑥 ∈ 𝒫 𝑉 ∣ (♯‘𝑥) = 2} → (𝑁 ∈ 𝑉 → 𝑃 ⊆ (Edg‘𝐺)))
20	3, 19	syl 17	. 2 ⊢ (𝐺 ∈ ComplUSGraph → (𝑁 ∈ 𝑉 → 𝑃 ⊆ (Edg‘𝐺)))
21	20	imp 406	1 ⊢ ((𝐺 ∈ ComplUSGraph ∧ 𝑁 ∈ 𝑉) → 𝑃 ⊆ (Edg‘𝐺))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 = wceq 1542 ∈ wcel 2114 ≠ wne 2933 ∃wrex 3062 {crab 3390 ⊆ wss 3890 𝒫 cpw 4542 {cpr 4570 ‘cfv 6499 2c2 12236 ♯chash 14292 Vtxcvtx 29065 Edgcedg 29116 ComplUSGraphccusgr 29479

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-sep 5232 ax-nul 5242 ax-pow 5308 ax-pr 5376 ax-un 7689 ax-cnex 11094 ax-resscn 11095 ax-1cn 11096 ax-icn 11097 ax-addcl 11098 ax-addrcl 11099 ax-mulcl 11100 ax-mulrcl 11101 ax-mulcom 11102 ax-addass 11103 ax-mulass 11104 ax-distr 11105 ax-i2m1 11106 ax-1ne0 11107 ax-1rid 11108 ax-rnegex 11109 ax-rrecex 11110 ax-cnre 11111 ax-pre-lttri 11112 ax-pre-lttrn 11113 ax-pre-ltadd 11114 ax-pre-mulgt0 11115

This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-nel 3038 df-ral 3053 df-rex 3063 df-reu 3344 df-rab 3391 df-v 3432 df-sbc 3730 df-csb 3839 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-pss 3910 df-nul 4275 df-if 4468 df-pw 4544 df-sn 4569 df-pr 4571 df-op 4575 df-uni 4852 df-int 4891 df-iun 4936 df-br 5087 df-opab 5149 df-mpt 5168 df-tr 5194 df-id 5526 df-eprel 5531 df-po 5539 df-so 5540 df-fr 5584 df-we 5586 df-xp 5637 df-rel 5638 df-cnv 5639 df-co 5640 df-dm 5641 df-rn 5642 df-res 5643 df-ima 5644 df-pred 6266 df-ord 6327 df-on 6328 df-lim 6329 df-suc 6330 df-iota 6455 df-fun 6501 df-fn 6502 df-f 6503 df-f1 6504 df-fo 6505 df-f1o 6506 df-fv 6507 df-riota 7324 df-ov 7370 df-oprab 7371 df-mpo 7372 df-om 7818 df-1st 7942 df-2nd 7943 df-frecs 8231 df-wrecs 8262 df-recs 8311 df-rdg 8349 df-1o 8405 df-2o 8406 df-oadd 8409 df-er 8643 df-en 8894 df-dom 8895 df-sdom 8896 df-fin 8897 df-dju 9825 df-card 9863 df-pnf 11181 df-mnf 11182 df-xr 11183 df-ltxr 11184 df-le 11185 df-sub 11379 df-neg 11380 df-nn 12175 df-2 12244 df-n0 12438 df-xnn0 12511 df-z 12525 df-uz 12789 df-fz 13462 df-hash 14293 df-edg 29117 df-upgr 29151 df-umgr 29152 df-usgr 29220 df-nbgr 29402 df-uvtx 29455 df-cplgr 29480 df-cusgr 29481

This theorem is referenced by: cusgrfi 29527

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