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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 5894 | . . . . 5 ⊢ dom ∅ = ∅ | |
| 3 | 2 | reseq2i 5960 | . . . 4 ⊢ ((iEdg‘𝐺) ↾ dom ∅) = ((iEdg‘𝐺) ↾ ∅) |
| 4 | res0 5967 | . . . 4 ⊢ ((iEdg‘𝐺) ↾ ∅) = ∅ | |
| 5 | 3, 4 | eqtr2i 2785 | . . 3 ⊢ ∅ = ((iEdg‘𝐺) ↾ dom ∅) |
| 6 | 0ss 4353 | . . 3 ⊢ ∅ ⊆ 𝒫 ∅ | |
| 7 | 1, 5, 6 | 3pm3.2i 1352 | . 2 ⊢ (∅ ⊆ (Vtx‘𝐺) ∧ ∅ = ((iEdg‘𝐺) ↾ dom ∅) ∧ ∅ ⊆ 𝒫 ∅) |
| 8 | 0ex 5256 | . . 3 ⊢ ∅ ∈ V | |
| 9 | vtxval0 29186 | . . . . 5 ⊢ (Vtx‘∅) = ∅ | |
| 10 | 9 | eqcomi 2770 | . . . 4 ⊢ ∅ = (Vtx‘∅) |
| 11 | eqid 2761 | . . . 4 ⊢ (Vtx‘𝐺) = (Vtx‘𝐺) | |
| 12 | iedgval0 29187 | . . . . 5 ⊢ (iEdg‘∅) = ∅ | |
| 13 | 12 | eqcomi 2770 | . . . 4 ⊢ ∅ = (iEdg‘∅) |
| 14 | eqid 2761 | . . . 4 ⊢ (iEdg‘𝐺) = (iEdg‘𝐺) | |
| 15 | edgval 29196 | . . . . 5 ⊢ (Edg‘∅) = ran (iEdg‘∅) | |
| 16 | 12 | rneqi 5911 | . . . . 5 ⊢ ran (iEdg‘∅) = ran ∅ |
| 17 | rn0 5900 | . . . . 5 ⊢ ran ∅ = ∅ | |
| 18 | 15, 16, 17 | 3eqtrri 2789 | . . . 4 ⊢ ∅ = (Edg‘∅) |
| 19 | 10, 11, 13, 14, 18 | issubgr 29418 | . . 3 ⊢ ((𝐺 ∈ 𝑊 ∧ ∅ ∈ V) → (∅ SubGraph 𝐺 ↔ (∅ ⊆ (Vtx‘𝐺) ∧ ∅ = ((iEdg‘𝐺) ↾ dom ∅) ∧ ∅ ⊆ 𝒫 ∅))) |
| 20 | 8, 19 | mpan2 701 | . 2 ⊢ (𝐺 ∈ 𝑊 → (∅ SubGraph 𝐺 ↔ (∅ ⊆ (Vtx‘𝐺) ∧ ∅ = ((iEdg‘𝐺) ↾ dom ∅) ∧ ∅ ⊆ 𝒫 ∅))) |
| 21 | 7, 20 | mpbiri 260 | 1 ⊢ (𝐺 ∈ 𝑊 → ∅ SubGraph 𝐺) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 208 ∧ w3a 1097 = wceq 1559 ∈ wcel 2141 Vcvv 3453 ⊆ wss 3904 ∅c0 4285 𝒫 cpw 4554 class class class wbr 5099 dom cdm 5645 ran crn 5646 ↾ cres 5647 ‘cfv 6517 Vtxcvtx 29143 iEdgciedg 29144 Edgcedg 29194 SubGraph csubgr 29414 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1814 ax-4 1828 ax-5 1929 ax-6 1986 ax-7 2027 ax-8 2143 ax-9 2151 ax-10 2174 ax-11 2190 ax-12 2211 ax-ext 2733 ax-sep 5245 ax-nul 5255 ax-pow 5321 ax-pr 5389 ax-un 7714 ax-cnex 11126 ax-resscn 11127 ax-1cn 11128 ax-icn 11129 ax-addcl 11130 ax-addrcl 11131 ax-mulcl 11132 ax-mulrcl 11133 ax-mulcom 11134 ax-addass 11135 ax-mulass 11136 ax-distr 11137 ax-i2m1 11138 ax-1ne0 11139 ax-1rid 11140 ax-rnegex 11141 ax-rrecex 11142 ax-cnre 11143 ax-pre-lttri 11144 ax-pre-lttrn 11145 ax-pre-ltadd 11146 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3or 1098 df-3an 1099 df-tru 1562 df-fal 1572 df-ex 1799 df-nf 1803 df-sb 2090 df-mo 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-nel 3061 df-ral 3076 df-rex 3086 df-reu 3367 df-rab 3414 df-v 3455 df-sbc 3745 df-csb 3853 df-dif 3907 df-un 3909 df-in 3911 df-ss 3921 df-pss 3924 df-nul 4286 df-if 4480 df-pw 4556 df-sn 4582 df-pr 4584 df-op 4588 df-uni 4865 df-iun 4950 df-br 5100 df-opab 5162 df-mpt 5181 df-tr 5207 df-id 5540 df-eprel 5545 df-po 5553 df-so 5554 df-fr 5598 df-we 5600 df-xp 5651 df-rel 5652 df-cnv 5653 df-co 5654 df-dm 5655 df-rn 5656 df-res 5657 df-ima 5658 df-pred 6284 df-ord 6345 df-on 6346 df-lim 6347 df-suc 6348 df-iota 6473 df-fun 6519 df-fn 6520 df-f 6521 df-f1 6522 df-fo 6523 df-f1o 6524 df-fv 6525 df-ov 7395 df-om 7843 df-2nd 7967 df-frecs 8257 df-wrecs 8288 df-recs 8337 df-rdg 8376 df-er 8673 df-en 8924 df-dom 8925 df-sdom 8926 df-pnf 11215 df-mnf 11216 df-ltxr 11218 df-nn 12208 df-2 12277 df-3 12278 df-4 12279 df-5 12280 df-6 12281 df-7 12282 df-8 12283 df-9 12284 df-n0 12479 df-dec 12686 df-slot 17201 df-ndx 17213 df-base 17229 df-edgf 29136 df-vtx 29145 df-iedg 29146 df-edg 29195 df-subgr 29415 |
| This theorem is referenced by: (None) |
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