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Theorem nbupgrel 27693

Description: A neighbor of a vertex in a pseudograph. (Contributed by AV, 5-Nov-2020.)

**Hypotheses**
Ref	Expression
nbuhgr.v	⊢ 𝑉 = (Vtx‘𝐺)
nbuhgr.e	⊢ 𝐸 = (Edg‘𝐺)

**Assertion**
Ref	Expression
nbupgrel	⊢ (((𝐺 ∈ UPGraph ∧ 𝐾 ∈ 𝑉) ∧ (𝑁 ∈ 𝑉 ∧ 𝑁 ≠ 𝐾)) → (𝑁 ∈ (𝐺 NeighbVtx 𝐾) ↔ {𝑁, 𝐾} ∈ 𝐸))

Proof of Theorem nbupgrel Dummy variable 𝑛 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		nbuhgr.v	. . . . . 6 ⊢ 𝑉 = (Vtx‘𝐺)
2		nbuhgr.e	. . . . . 6 ⊢ 𝐸 = (Edg‘𝐺)
3	1, 2	nbupgr 27692	. . . . 5 ⊢ ((𝐺 ∈ UPGraph ∧ 𝐾 ∈ 𝑉) → (𝐺 NeighbVtx 𝐾) = {𝑛 ∈ (𝑉 ∖ {𝐾}) ∣ {𝐾, 𝑛} ∈ 𝐸})
4	3	eleq2d 2825	. . . 4 ⊢ ((𝐺 ∈ UPGraph ∧ 𝐾 ∈ 𝑉) → (𝑁 ∈ (𝐺 NeighbVtx 𝐾) ↔ 𝑁 ∈ {𝑛 ∈ (𝑉 ∖ {𝐾}) ∣ {𝐾, 𝑛} ∈ 𝐸}))
5		preq2 4675	. . . . . 6 ⊢ (𝑛 = 𝑁 → {𝐾, 𝑛} = {𝐾, 𝑁})
6	5	eleq1d 2824	. . . . 5 ⊢ (𝑛 = 𝑁 → ({𝐾, 𝑛} ∈ 𝐸 ↔ {𝐾, 𝑁} ∈ 𝐸))
7	6	elrab 3625	. . . 4 ⊢ (𝑁 ∈ {𝑛 ∈ (𝑉 ∖ {𝐾}) ∣ {𝐾, 𝑛} ∈ 𝐸} ↔ (𝑁 ∈ (𝑉 ∖ {𝐾}) ∧ {𝐾, 𝑁} ∈ 𝐸))
8	4, 7	bitrdi 286	. . 3 ⊢ ((𝐺 ∈ UPGraph ∧ 𝐾 ∈ 𝑉) → (𝑁 ∈ (𝐺 NeighbVtx 𝐾) ↔ (𝑁 ∈ (𝑉 ∖ {𝐾}) ∧ {𝐾, 𝑁} ∈ 𝐸)))
9	8	adantr 480	. 2 ⊢ (((𝐺 ∈ UPGraph ∧ 𝐾 ∈ 𝑉) ∧ (𝑁 ∈ 𝑉 ∧ 𝑁 ≠ 𝐾)) → (𝑁 ∈ (𝐺 NeighbVtx 𝐾) ↔ (𝑁 ∈ (𝑉 ∖ {𝐾}) ∧ {𝐾, 𝑁} ∈ 𝐸)))
10		eldifsn 4725	. . . . 5 ⊢ (𝑁 ∈ (𝑉 ∖ {𝐾}) ↔ (𝑁 ∈ 𝑉 ∧ 𝑁 ≠ 𝐾))
11	10	biimpri 227	. . . 4 ⊢ ((𝑁 ∈ 𝑉 ∧ 𝑁 ≠ 𝐾) → 𝑁 ∈ (𝑉 ∖ {𝐾}))
12	11	adantl 481	. . 3 ⊢ (((𝐺 ∈ UPGraph ∧ 𝐾 ∈ 𝑉) ∧ (𝑁 ∈ 𝑉 ∧ 𝑁 ≠ 𝐾)) → 𝑁 ∈ (𝑉 ∖ {𝐾}))
13	12	biantrurd 532	. 2 ⊢ (((𝐺 ∈ UPGraph ∧ 𝐾 ∈ 𝑉) ∧ (𝑁 ∈ 𝑉 ∧ 𝑁 ≠ 𝐾)) → ({𝐾, 𝑁} ∈ 𝐸 ↔ (𝑁 ∈ (𝑉 ∖ {𝐾}) ∧ {𝐾, 𝑁} ∈ 𝐸)))
14		prcom 4673	. . . 4 ⊢ {𝐾, 𝑁} = {𝑁, 𝐾}
15	14	eleq1i 2830	. . 3 ⊢ ({𝐾, 𝑁} ∈ 𝐸 ↔ {𝑁, 𝐾} ∈ 𝐸)
16	15	a1i 11	. 2 ⊢ (((𝐺 ∈ UPGraph ∧ 𝐾 ∈ 𝑉) ∧ (𝑁 ∈ 𝑉 ∧ 𝑁 ≠ 𝐾)) → ({𝐾, 𝑁} ∈ 𝐸 ↔ {𝑁, 𝐾} ∈ 𝐸))
17	9, 13, 16	3bitr2d 306	1 ⊢ (((𝐺 ∈ UPGraph ∧ 𝐾 ∈ 𝑉) ∧ (𝑁 ∈ 𝑉 ∧ 𝑁 ≠ 𝐾)) → (𝑁 ∈ (𝐺 NeighbVtx 𝐾) ↔ {𝑁, 𝐾} ∈ 𝐸))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 395 = wceq 1541 ∈ wcel 2109 ≠ wne 2944 {crab 3069 ∖ cdif 3888 {csn 4566 {cpr 4568 ‘cfv 6430 (class class class)co 7268 Vtxcvtx 27347 Edgcedg 27398 UPGraphcupgr 27431 NeighbVtx cnbgr 27680

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1801 ax-4 1815 ax-5 1916 ax-6 1974 ax-7 2014 ax-8 2111 ax-9 2119 ax-10 2140 ax-11 2157 ax-12 2174 ax-ext 2710 ax-sep 5226 ax-nul 5233 ax-pow 5291 ax-pr 5355 ax-un 7579 ax-cnex 10911 ax-resscn 10912 ax-1cn 10913 ax-icn 10914 ax-addcl 10915 ax-addrcl 10916 ax-mulcl 10917 ax-mulrcl 10918 ax-mulcom 10919 ax-addass 10920 ax-mulass 10921 ax-distr 10922 ax-i2m1 10923 ax-1ne0 10924 ax-1rid 10925 ax-rnegex 10926 ax-rrecex 10927 ax-cnre 10928 ax-pre-lttri 10929 ax-pre-lttrn 10930 ax-pre-ltadd 10931 ax-pre-mulgt0 10932

This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3or 1086 df-3an 1087 df-tru 1544 df-fal 1554 df-ex 1786 df-nf 1790 df-sb 2071 df-mo 2541 df-eu 2570 df-clab 2717 df-cleq 2731 df-clel 2817 df-nfc 2890 df-ne 2945 df-nel 3051 df-ral 3070 df-rex 3071 df-reu 3072 df-rab 3074 df-v 3432 df-sbc 3720 df-csb 3837 df-dif 3894 df-un 3896 df-in 3898 df-ss 3908 df-pss 3910 df-nul 4262 df-if 4465 df-pw 4540 df-sn 4567 df-pr 4569 df-tp 4571 df-op 4573 df-uni 4845 df-int 4885 df-iun 4931 df-br 5079 df-opab 5141 df-mpt 5162 df-tr 5196 df-id 5488 df-eprel 5494 df-po 5502 df-so 5503 df-fr 5543 df-we 5545 df-xp 5594 df-rel 5595 df-cnv 5596 df-co 5597 df-dm 5598 df-rn 5599 df-res 5600 df-ima 5601 df-pred 6199 df-ord 6266 df-on 6267 df-lim 6268 df-suc 6269 df-iota 6388 df-fun 6432 df-fn 6433 df-f 6434 df-f1 6435 df-fo 6436 df-f1o 6437 df-fv 6438 df-riota 7225 df-ov 7271 df-oprab 7272 df-mpo 7273 df-om 7701 df-1st 7817 df-2nd 7818 df-frecs 8081 df-wrecs 8112 df-recs 8186 df-rdg 8225 df-1o 8281 df-2o 8282 df-oadd 8285 df-er 8472 df-en 8708 df-dom 8709 df-sdom 8710 df-fin 8711 df-dju 9643 df-card 9681 df-pnf 10995 df-mnf 10996 df-xr 10997 df-ltxr 10998 df-le 10999 df-sub 11190 df-neg 11191 df-nn 11957 df-2 12019 df-n0 12217 df-xnn0 12289 df-z 12303 df-uz 12565 df-fz 13222 df-hash 14026 df-edg 27399 df-upgr 27433 df-nbgr 27681

This theorem is referenced by: nbupgrres 27712 cplgr3v 27783

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