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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 4429 | . 2 ⊢ ∀𝑘 ∈ ∅ ∀𝑛 ∈ ∅ ∃𝑓∃𝑝 𝑓(𝑘(PathsOn‘∅)𝑛)𝑝 | |
| 2 | 0ex 5232 | . . 3 ⊢ ∅ ∈ V | |
| 3 | vtxval0 29130 | . . . . 5 ⊢ (Vtx‘∅) = ∅ | |
| 4 | 3 | eqcomi 2750 | . . . 4 ⊢ ∅ = (Vtx‘∅) |
| 5 | 4 | isconngr 30281 | . . 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 233 | 1 ⊢ ∅ ∈ ConnGraph |
| Colors of variables: wff setvar class |
| Syntax hints: ↔ wb 208 ∃wex 1787 ∈ wcel 2121 ∀wral 3055 Vcvv 3433 ∅c0 4264 class class class wbr 5075 ‘cfv 6489 (class class class)co 7360 Vtxcvtx 29087 PathsOncpthson 29802 ConnGraphcconngr 30278 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1975 ax-7 2016 ax-8 2123 ax-9 2131 ax-10 2154 ax-11 2170 ax-12 2191 ax-ext 2713 ax-sep 5221 ax-nul 5231 ax-pow 5297 ax-pr 5365 ax-un 7682 ax-cnex 11089 ax-1cn 11091 ax-addcl 11093 |
| This theorem depends on definitions: df-bi 209 df-an 398 df-or 855 df-3or 1094 df-3an 1095 df-tru 1551 df-fal 1561 df-ex 1788 df-nf 1792 df-sb 2075 df-mo 2545 df-eu 2575 df-clab 2720 df-cleq 2733 df-clel 2816 df-nfc 2890 df-ne 2937 df-ral 3056 df-rex 3066 df-reu 3347 df-rab 3394 df-v 3435 df-sbc 3726 df-csb 3834 df-dif 3888 df-un 3890 df-in 3892 df-ss 3902 df-pss 3905 df-nul 4265 df-if 4458 df-pw 4534 df-sn 4559 df-pr 4561 df-op 4565 df-uni 4842 df-iun 4926 df-br 5076 df-opab 5138 df-mpt 5157 df-tr 5183 df-id 5516 df-eprel 5521 df-po 5529 df-so 5530 df-fr 5574 df-we 5576 df-xp 5627 df-rel 5628 df-cnv 5629 df-co 5630 df-dm 5631 df-rn 5632 df-res 5633 df-ima 5634 df-pred 6256 df-ord 6317 df-on 6318 df-lim 6319 df-suc 6320 df-iota 6445 df-fun 6491 df-fn 6492 df-f 6493 df-f1 6494 df-fo 6495 df-f1o 6496 df-fv 6497 df-ov 7363 df-om 7811 df-2nd 7936 df-frecs 8225 df-wrecs 8256 df-recs 8305 df-rdg 8343 df-nn 12170 df-slot 17147 df-ndx 17159 df-base 17175 df-vtx 29089 df-conngr 30279 |
| This theorem is referenced by: (None) |
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