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| Mirrors > Home > MPE Home > Th. List > Mathboxes > grtrissvtx | Structured version Visualization version GIF version | ||
| Description: A triangle is a subset of the vertices (of a graph). (Contributed by AV, 26-Jul-2025.) |
| Ref | Expression |
|---|---|
| grtrissvtx.v | ⊢ 𝑉 = (Vtx‘𝐺) |
| Ref | Expression |
|---|---|
| grtrissvtx | ⊢ (𝑇 ∈ (GrTriangles‘𝐺) → 𝑇 ⊆ 𝑉) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | grtrissvtx.v | . . 3 ⊢ 𝑉 = (Vtx‘𝐺) | |
| 2 | eqid 2737 | . . 3 ⊢ (Edg‘𝐺) = (Edg‘𝐺) | |
| 3 | 1, 2 | grtriprop 48295 | . 2 ⊢ (𝑇 ∈ (GrTriangles‘𝐺) → ∃𝑥 ∈ 𝑉 ∃𝑦 ∈ 𝑉 ∃𝑧 ∈ 𝑉 (𝑇 = {𝑥, 𝑦, 𝑧} ∧ (♯‘𝑇) = 3 ∧ ({𝑥, 𝑦} ∈ (Edg‘𝐺) ∧ {𝑥, 𝑧} ∈ (Edg‘𝐺) ∧ {𝑦, 𝑧} ∈ (Edg‘𝐺)))) |
| 4 | tpssi 4796 | . . . . . 6 ⊢ ((𝑥 ∈ 𝑉 ∧ 𝑦 ∈ 𝑉 ∧ 𝑧 ∈ 𝑉) → {𝑥, 𝑦, 𝑧} ⊆ 𝑉) | |
| 5 | 4 | 3expa 1119 | . . . . 5 ⊢ (((𝑥 ∈ 𝑉 ∧ 𝑦 ∈ 𝑉) ∧ 𝑧 ∈ 𝑉) → {𝑥, 𝑦, 𝑧} ⊆ 𝑉) |
| 6 | sseq1 3961 | . . . . . 6 ⊢ (𝑇 = {𝑥, 𝑦, 𝑧} → (𝑇 ⊆ 𝑉 ↔ {𝑥, 𝑦, 𝑧} ⊆ 𝑉)) | |
| 7 | 6 | 3ad2ant1 1134 | . . . . 5 ⊢ ((𝑇 = {𝑥, 𝑦, 𝑧} ∧ (♯‘𝑇) = 3 ∧ ({𝑥, 𝑦} ∈ (Edg‘𝐺) ∧ {𝑥, 𝑧} ∈ (Edg‘𝐺) ∧ {𝑦, 𝑧} ∈ (Edg‘𝐺))) → (𝑇 ⊆ 𝑉 ↔ {𝑥, 𝑦, 𝑧} ⊆ 𝑉)) |
| 8 | 5, 7 | syl5ibrcom 247 | . . . 4 ⊢ (((𝑥 ∈ 𝑉 ∧ 𝑦 ∈ 𝑉) ∧ 𝑧 ∈ 𝑉) → ((𝑇 = {𝑥, 𝑦, 𝑧} ∧ (♯‘𝑇) = 3 ∧ ({𝑥, 𝑦} ∈ (Edg‘𝐺) ∧ {𝑥, 𝑧} ∈ (Edg‘𝐺) ∧ {𝑦, 𝑧} ∈ (Edg‘𝐺))) → 𝑇 ⊆ 𝑉)) |
| 9 | 8 | rexlimdva 3139 | . . 3 ⊢ ((𝑥 ∈ 𝑉 ∧ 𝑦 ∈ 𝑉) → (∃𝑧 ∈ 𝑉 (𝑇 = {𝑥, 𝑦, 𝑧} ∧ (♯‘𝑇) = 3 ∧ ({𝑥, 𝑦} ∈ (Edg‘𝐺) ∧ {𝑥, 𝑧} ∈ (Edg‘𝐺) ∧ {𝑦, 𝑧} ∈ (Edg‘𝐺))) → 𝑇 ⊆ 𝑉)) |
| 10 | 9 | rexlimivv 3180 | . 2 ⊢ (∃𝑥 ∈ 𝑉 ∃𝑦 ∈ 𝑉 ∃𝑧 ∈ 𝑉 (𝑇 = {𝑥, 𝑦, 𝑧} ∧ (♯‘𝑇) = 3 ∧ ({𝑥, 𝑦} ∈ (Edg‘𝐺) ∧ {𝑥, 𝑧} ∈ (Edg‘𝐺) ∧ {𝑦, 𝑧} ∈ (Edg‘𝐺))) → 𝑇 ⊆ 𝑉) |
| 11 | 3, 10 | syl 17 | 1 ⊢ (𝑇 ∈ (GrTriangles‘𝐺) → 𝑇 ⊆ 𝑉) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 ∧ w3a 1087 = wceq 1542 ∈ wcel 2114 ∃wrex 3062 ⊆ wss 3903 {cpr 4584 {ctp 4586 ‘cfv 6500 3c3 12213 ♯chash 14265 Vtxcvtx 29081 Edgcedg 29132 GrTrianglescgrtri 48291 |
| 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-rep 5226 ax-sep 5243 ax-nul 5253 ax-pow 5312 ax-pr 5379 ax-un 7690 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 3353 df-rab 3402 df-v 3444 df-sbc 3743 df-csb 3852 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-pss 3923 df-nul 4288 df-if 4482 df-pw 4558 df-sn 4583 df-pr 4585 df-tp 4587 df-op 4589 df-uni 4866 df-int 4905 df-iun 4950 df-br 5101 df-opab 5163 df-mpt 5182 df-tr 5208 df-id 5527 df-eprel 5532 df-po 5540 df-so 5541 df-fr 5585 df-we 5587 df-xp 5638 df-rel 5639 df-cnv 5640 df-co 5641 df-dm 5642 df-rn 5643 df-res 5644 df-ima 5645 df-pred 6267 df-ord 6328 df-on 6329 df-lim 6330 df-suc 6331 df-iota 6456 df-fun 6502 df-fn 6503 df-f 6504 df-f1 6505 df-fo 6506 df-f1o 6507 df-fv 6508 df-riota 7325 df-ov 7371 df-oprab 7372 df-mpo 7373 df-om 7819 df-1st 7943 df-2nd 7944 df-frecs 8233 df-wrecs 8264 df-recs 8313 df-rdg 8351 df-1o 8407 df-2o 8408 df-3o 8409 df-oadd 8411 df-er 8645 df-en 8896 df-dom 8897 df-sdom 8898 df-fin 8899 df-dju 9825 df-card 9863 df-pnf 11180 df-mnf 11181 df-xr 11182 df-ltxr 11183 df-le 11184 df-sub 11378 df-neg 11379 df-nn 12158 df-2 12220 df-3 12221 df-n0 12414 df-xnn0 12487 df-z 12501 df-uz 12764 df-fz 13436 df-fzo 13583 df-hash 14266 df-grtri 48292 |
| This theorem is referenced by: grtriclwlk3 48299 |
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