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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 4353 | . . 3 ⊢ ∅ ⊆ (Vtx‘𝐺) | |
| 2 | dm0 5908 | . . . . 5 ⊢ dom ∅ = ∅ | |
| 3 | 2 | reseq2i 5973 | . . . 4 ⊢ ((iEdg‘𝐺) ↾ dom ∅) = ((iEdg‘𝐺) ↾ ∅) |
| 4 | res0 5980 | . . . 4 ⊢ ((iEdg‘𝐺) ↾ ∅) = ∅ | |
| 5 | 3, 4 | eqtr2i 2786 | . . 3 ⊢ ∅ = ((iEdg‘𝐺) ↾ dom ∅) |
| 6 | 0ss 4353 | . . 3 ⊢ ∅ ⊆ 𝒫 ∅ | |
| 7 | 1, 5, 6 | 3pm3.2i 1358 | . 2 ⊢ (∅ ⊆ (Vtx‘𝐺) ∧ ∅ = ((iEdg‘𝐺) ↾ dom ∅) ∧ ∅ ⊆ 𝒫 ∅) |
| 8 | 0ex 5268 | . . 3 ⊢ ∅ ∈ V | |
| 9 | vtxval0 29504 | . . . . 5 ⊢ (Vtx‘∅) = ∅ | |
| 10 | 9 | eqcomi 2771 | . . . 4 ⊢ ∅ = (Vtx‘∅) |
| 11 | eqid 2762 | . . . 4 ⊢ (Vtx‘𝐺) = (Vtx‘𝐺) | |
| 12 | iedgval0 29505 | . . . . 5 ⊢ (iEdg‘∅) = ∅ | |
| 13 | 12 | eqcomi 2771 | . . . 4 ⊢ ∅ = (iEdg‘∅) |
| 14 | eqid 2762 | . . . 4 ⊢ (iEdg‘𝐺) = (iEdg‘𝐺) | |
| 15 | edgval 29514 | . . . . 5 ⊢ (Edg‘∅) = ran (iEdg‘∅) | |
| 16 | 12 | rneqi 5925 | . . . . 5 ⊢ ran (iEdg‘∅) = ran ∅ |
| 17 | rn0 5914 | . . . . 5 ⊢ ran ∅ = ∅ | |
| 18 | 15, 16, 17 | 3eqtrri 2790 | . . . 4 ⊢ ∅ = (Edg‘∅) |
| 19 | 10, 11, 13, 14, 18 | issubgr 29739 | . . 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 3453 ⊆ wss 3902 ∅c0 4282 𝒫 cpw 4560 class class class wbr 5107 dom cdm 5659 ran crn 5660 ↾ cres 5661 ‘cfv 6537 Vtxcvtx 29461 iEdgciedg 29462 Edgcedg 29512 SubGraph csubgr 29735 |
| 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 2215 ax-ext 2734 ax-sep 5255 ax-nul 5267 ax-pow 5334 ax-pr 5402 ax-un 7740 ax-cnex 11184 ax-resscn 11185 ax-1cn 11186 ax-icn 11187 ax-addcl 11188 ax-addrcl 11189 ax-mulcl 11190 ax-mulrcl 11191 ax-mulcom 11192 ax-addass 11193 ax-mulass 11194 ax-distr 11195 ax-i2m1 11196 ax-1ne0 11197 ax-1rid 11198 ax-rnegex 11199 ax-rrecex 11200 ax-cnre 11201 ax-pre-lttri 11202 ax-pre-lttrn 11203 ax-pre-ltadd 11204 |
| 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 2566 df-eu 2596 df-clab 2741 df-cleq 2754 df-clel 2837 df-nfc 2911 df-ne 2958 df-nel 3064 df-ral 3079 df-rex 3089 df-reu 3368 df-rab 3415 df-v 3455 df-sbc 3743 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-pss 3922 df-nul 4283 df-if 4486 df-pw 4562 df-sn 4588 df-pr 4590 df-op 4594 df-uni 4871 df-iun 4956 df-br 5108 df-opab 5172 df-mpt 5191 df-tr 5217 df-id 5554 df-eprel 5559 df-po 5567 df-so 5568 df-fr 5612 df-we 5614 df-xp 5665 df-rel 5666 df-cnv 5667 df-co 5668 df-dm 5669 df-rn 5670 df-res 5671 df-ima 5672 df-pred 6303 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6493 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-ov 7420 df-om 7867 df-2nd 7991 df-frecs 8284 df-wrecs 8315 df-recs 8364 df-rdg 8403 df-er 8700 df-en 8957 df-dom 8958 df-sdom 8959 df-pnf 11273 df-mnf 11274 df-ltxr 11276 df-nn 12262 df-2 12331 df-3 12332 df-4 12333 df-5 12334 df-6 12335 df-7 12336 df-8 12337 df-9 12338 df-n0 12533 df-dec 12741 df-slot 17280 df-ndx 17292 df-base 17308 df-edgf 29454 df-vtx 29463 df-iedg 29464 df-edg 29513 df-subgr 29736 |
| This theorem is used by: (None) |
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