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| Mirrors > Home > MPE Home > Th. List > 0grsubgr | Structured version Visualization version GIF version | ||
| Description: The null graph (represented by an empty set) is a subgraph of all graphs. (Contributed by AV, 17-Nov-2020.) |
| Ref | Expression |
|---|---|
| 0grsubgr | ⊢ (𝐺 ∈ 𝑊 → ∅ SubGraph 𝐺) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0ss 4350 | . . 3 ⊢ ∅ ⊆ (Vtx‘𝐺) | |
| 2 | dm0 5902 | . . . . 5 ⊢ dom ∅ = ∅ | |
| 3 | 2 | reseq2i 5967 | . . . 4 ⊢ ((iEdg‘𝐺) ↾ dom ∅) = ((iEdg‘𝐺) ↾ ∅) |
| 4 | res0 5974 | . . . 4 ⊢ ((iEdg‘𝐺) ↾ ∅) = ∅ | |
| 5 | 3, 4 | eqtr2i 2785 | . . 3 ⊢ ∅ = ((iEdg‘𝐺) ↾ dom ∅) |
| 6 | 0ss 4350 | . . 3 ⊢ ∅ ⊆ 𝒫 ∅ | |
| 7 | 1, 5, 6 | 3pm3.2i 1358 | . 2 ⊢ (∅ ⊆ (Vtx‘𝐺) ∧ ∅ = ((iEdg‘𝐺) ↾ dom ∅) ∧ ∅ ⊆ 𝒫 ∅) |
| 8 | 0ex 5261 | . . 3 ⊢ ∅ ∈ V | |
| 9 | vtxval0 29599 | . . . . 5 ⊢ (Vtx‘∅) = ∅ | |
| 10 | 9 | eqcomi 2770 | . . . 4 ⊢ ∅ = (Vtx‘∅) |
| 11 | eqid 2761 | . . . 4 ⊢ (Vtx‘𝐺) = (Vtx‘𝐺) | |
| 12 | iedgval0 29600 | . . . . 5 ⊢ (iEdg‘∅) = ∅ | |
| 13 | 12 | eqcomi 2770 | . . . 4 ⊢ ∅ = (iEdg‘∅) |
| 14 | eqid 2761 | . . . 4 ⊢ (iEdg‘𝐺) = (iEdg‘𝐺) | |
| 15 | edgval 29609 | . . . . 5 ⊢ (Edg‘∅) = ran (iEdg‘∅) | |
| 16 | 12 | rneqi 5919 | . . . . 5 ⊢ ran (iEdg‘∅) = ran ∅ |
| 17 | rn0 5908 | . . . . 5 ⊢ ran ∅ = ∅ | |
| 18 | 15, 16, 17 | 3eqtrri 2789 | . . . 4 ⊢ ∅ = (Edg‘∅) |
| 19 | 10, 11, 13, 14, 18 | issubgr 29834 | . . 3 ⊢ ((𝐺 ∈ 𝑊 ∧ ∅ ∈ V) → (∅ SubGraph 𝐺 ↔ (∅ ⊆ (Vtx‘𝐺) ∧ ∅ = ((iEdg‘𝐺) ↾ dom ∅) ∧ ∅ ⊆ 𝒫 ∅))) |
| 20 | 8, 19 | mpan2 704 | . 2 ⊢ (𝐺 ∈ 𝑊 → (∅ SubGraph 𝐺 ↔ (∅ ⊆ (Vtx‘𝐺) ∧ ∅ = ((iEdg‘𝐺) ↾ dom ∅) ∧ ∅ ⊆ 𝒫 ∅))) |
| 21 | 7, 20 | mpbiri 261 | 1 ⊢ (𝐺 ∈ 𝑊 → ∅ SubGraph 𝐺) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ w3a 1103 = wceq 1570 ∈ wcel 2145 Vcvv 3451 ⊆ wss 3899 ∅c0 4279 𝒫 cpw 4557 class class class wbr 5103 dom cdm 5651 ran crn 5652 ↾ cres 5653 ‘cfv 6531 Vtxcvtx 29556 iEdgciedg 29557 Edgcedg 29607 SubGraph csubgr 29830 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2733 ax-sep 5249 ax-nul 5260 ax-pow 5327 ax-pr 5391 ax-un 7740 ax-cnex 11237 ax-resscn 11238 ax-1cn 11239 ax-icn 11240 ax-addcl 11241 ax-addrcl 11242 ax-mulcl 11243 ax-mulrcl 11244 ax-mulcom 11245 ax-addass 11246 ax-mulass 11247 ax-distr 11248 ax-i2m1 11249 ax-1ne0 11250 ax-1rid 11251 ax-rnegex 11252 ax-rrecex 11253 ax-cnre 11254 ax-pre-lttri 11255 ax-pre-lttrn 11256 ax-pre-ltadd 11257 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-nel 3063 df-ral 3078 df-rex 3088 df-reu 3367 df-rab 3414 df-v 3453 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-pss 3919 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-iun 4953 df-br 5104 df-opab 5168 df-mpt 5187 df-tr 5213 df-id 5546 df-eprel 5551 df-po 5559 df-so 5560 df-fr 5604 df-we 5606 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-pred 6297 df-ord 6358 df-on 6359 df-lim 6360 df-suc 6361 df-iota 6487 df-fun 6533 df-fn 6534 df-f 6535 df-f1 6536 df-fo 6537 df-f1o 6538 df-fv 6539 df-ov 7415 df-om 7867 df-2nd 7991 df-frecs 8283 df-wrecs 8314 df-recs 8363 df-rdg 8402 df-er 8701 df-en 8958 df-dom 8959 df-sdom 8960 df-pnf 11326 df-mnf 11327 df-ltxr 11329 df-nn 12317 df-2 12386 df-3 12387 df-4 12388 df-5 12389 df-6 12390 df-7 12391 df-8 12392 df-9 12393 df-n0 12588 df-dec 12796 df-slot 17340 df-ndx 17352 df-base 17368 df-edgf 29549 df-vtx 29558 df-iedg 29559 df-edg 29608 df-subgr 29831 |
| This theorem is used by: (None) |
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