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| Mirrors > Home > MPE Home > Th. List > 0conngr | Structured version Visualization version GIF version | ||
| Description: A graph without vertices is connected. (Contributed by Alexander van der Vekens, 2-Dec-2017.) (Revised by AV, 15-Feb-2021.) |
| Ref | Expression |
|---|---|
| 0conngr | ⊢ ∅ ∈ ConnGraph |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ral0 4453 | . 2 ⊢ ∀𝑘 ∈ ∅ ∀𝑛 ∈ ∅ ∃𝑓∃𝑝 𝑓(𝑘(PathsOn‘∅)𝑛)𝑝 | |
| 2 | 0ex 5256 | . . 3 ⊢ ∅ ∈ V | |
| 3 | vtxval0 29130 | . . . . 5 ⊢ (Vtx‘∅) = ∅ | |
| 4 | 3 | eqcomi 2746 | . . . 4 ⊢ ∅ = (Vtx‘∅) |
| 5 | 4 | isconngr 30282 | . . 3 ⊢ (∅ ∈ V → (∅ ∈ ConnGraph ↔ ∀𝑘 ∈ ∅ ∀𝑛 ∈ ∅ ∃𝑓∃𝑝 𝑓(𝑘(PathsOn‘∅)𝑛)𝑝)) |
| 6 | 2, 5 | ax-mp 5 | . 2 ⊢ (∅ ∈ ConnGraph ↔ ∀𝑘 ∈ ∅ ∀𝑛 ∈ ∅ ∃𝑓∃𝑝 𝑓(𝑘(PathsOn‘∅)𝑛)𝑝) |
| 7 | 1, 6 | mpbir 231 | 1 ⊢ ∅ ∈ ConnGraph |
| Colors of variables: wff setvar class |
| Syntax hints: ↔ wb 206 ∃wex 1781 ∈ wcel 2114 ∀wral 3052 Vcvv 3442 ∅c0 4287 class class class wbr 5100 ‘cfv 6502 (class class class)co 7370 Vtxcvtx 29087 PathsOncpthson 29803 ConnGraphcconngr 30279 |
| 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-sep 5245 ax-nul 5255 ax-pow 5314 ax-pr 5381 ax-un 7692 ax-cnex 11096 ax-1cn 11098 ax-addcl 11100 |
| 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-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-op 4589 df-uni 4866 df-iun 4950 df-br 5101 df-opab 5163 df-mpt 5182 df-tr 5208 df-id 5529 df-eprel 5534 df-po 5542 df-so 5543 df-fr 5587 df-we 5589 df-xp 5640 df-rel 5641 df-cnv 5642 df-co 5643 df-dm 5644 df-rn 5645 df-res 5646 df-ima 5647 df-pred 6269 df-ord 6330 df-on 6331 df-lim 6332 df-suc 6333 df-iota 6458 df-fun 6504 df-fn 6505 df-f 6506 df-f1 6507 df-fo 6508 df-f1o 6509 df-fv 6510 df-ov 7373 df-om 7821 df-2nd 7946 df-frecs 8235 df-wrecs 8266 df-recs 8315 df-rdg 8353 df-nn 12160 df-slot 17123 df-ndx 17135 df-base 17151 df-vtx 29089 df-conngr 30280 |
| This theorem is referenced by: (None) |
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