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Mirrors > Home > MPE Home > Th. List > 0cycl | Structured version Visualization version GIF version |
Description: A pair of an empty set (of edges) and a second set (of vertices) is a cycle if and only if the second set contains exactly one vertex (in an undirected graph). (Contributed by Alexander van der Vekens, 30-Oct-2017.) (Revised by AV, 31-Jan-2021.) (Revised by AV, 30-Oct-2021.) |
Ref | Expression |
---|---|
0cycl | β’ (πΊ β π β (β (CyclesβπΊ)π β π:(0...0)βΆ(VtxβπΊ))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqid 2730 | . . . 4 β’ (VtxβπΊ) = (VtxβπΊ) | |
2 | 1 | 0pth 29643 | . . 3 β’ (πΊ β π β (β (PathsβπΊ)π β π:(0...0)βΆ(VtxβπΊ))) |
3 | 2 | anbi1d 628 | . 2 β’ (πΊ β π β ((β (PathsβπΊ)π β§ (πβ0) = (πβ(β―ββ ))) β (π:(0...0)βΆ(VtxβπΊ) β§ (πβ0) = (πβ(β―ββ ))))) |
4 | iscycl 29313 | . 2 β’ (β (CyclesβπΊ)π β (β (PathsβπΊ)π β§ (πβ0) = (πβ(β―ββ )))) | |
5 | hash0 14333 | . . . . 5 β’ (β―ββ ) = 0 | |
6 | 5 | eqcomi 2739 | . . . 4 β’ 0 = (β―ββ ) |
7 | 6 | fveq2i 6895 | . . 3 β’ (πβ0) = (πβ(β―ββ )) |
8 | 7 | biantru 528 | . 2 β’ (π:(0...0)βΆ(VtxβπΊ) β (π:(0...0)βΆ(VtxβπΊ) β§ (πβ0) = (πβ(β―ββ )))) |
9 | 3, 4, 8 | 3bitr4g 313 | 1 β’ (πΊ β π β (β (CyclesβπΊ)π β π:(0...0)βΆ(VtxβπΊ))) |
Colors of variables: wff setvar class |
Syntax hints: β wi 4 β wb 205 β§ wa 394 = wceq 1539 β wcel 2104 β c0 4323 class class class wbr 5149 βΆwf 6540 βcfv 6544 (class class class)co 7413 0cc0 11114 ...cfz 13490 β―chash 14296 Vtxcvtx 28521 Pathscpths 29234 Cyclesccycls 29307 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1911 ax-6 1969 ax-7 2009 ax-8 2106 ax-9 2114 ax-10 2135 ax-11 2152 ax-12 2169 ax-ext 2701 ax-rep 5286 ax-sep 5300 ax-nul 5307 ax-pow 5364 ax-pr 5428 ax-un 7729 ax-cnex 11170 ax-resscn 11171 ax-1cn 11172 ax-icn 11173 ax-addcl 11174 ax-addrcl 11175 ax-mulcl 11176 ax-mulrcl 11177 ax-mulcom 11178 ax-addass 11179 ax-mulass 11180 ax-distr 11181 ax-i2m1 11182 ax-1ne0 11183 ax-1rid 11184 ax-rnegex 11185 ax-rrecex 11186 ax-cnre 11187 ax-pre-lttri 11188 ax-pre-lttrn 11189 ax-pre-ltadd 11190 ax-pre-mulgt0 11191 |
This theorem depends on definitions: df-bi 206 df-an 395 df-or 844 df-ifp 1060 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2532 df-eu 2561 df-clab 2708 df-cleq 2722 df-clel 2808 df-nfc 2883 df-ne 2939 df-nel 3045 df-ral 3060 df-rex 3069 df-reu 3375 df-rab 3431 df-v 3474 df-sbc 3779 df-csb 3895 df-dif 3952 df-un 3954 df-in 3956 df-ss 3966 df-pss 3968 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-op 4636 df-uni 4910 df-int 4952 df-iun 5000 df-br 5150 df-opab 5212 df-mpt 5233 df-tr 5267 df-id 5575 df-eprel 5581 df-po 5589 df-so 5590 df-fr 5632 df-we 5634 df-xp 5683 df-rel 5684 df-cnv 5685 df-co 5686 df-dm 5687 df-rn 5688 df-res 5689 df-ima 5690 df-pred 6301 df-ord 6368 df-on 6369 df-lim 6370 df-suc 6371 df-iota 6496 df-fun 6546 df-fn 6547 df-f 6548 df-f1 6549 df-fo 6550 df-f1o 6551 df-fv 6552 df-riota 7369 df-ov 7416 df-oprab 7417 df-mpo 7418 df-om 7860 df-1st 7979 df-2nd 7980 df-frecs 8270 df-wrecs 8301 df-recs 8375 df-rdg 8414 df-1o 8470 df-er 8707 df-map 8826 df-pm 8827 df-en 8944 df-dom 8945 df-sdom 8946 df-fin 8947 df-card 9938 df-pnf 11256 df-mnf 11257 df-xr 11258 df-ltxr 11259 df-le 11260 df-sub 11452 df-neg 11453 df-nn 12219 df-n0 12479 df-z 12565 df-uz 12829 df-fz 13491 df-fzo 13634 df-hash 14297 df-word 14471 df-wlks 29121 df-trls 29214 df-pths 29238 df-cycls 29309 |
This theorem is referenced by: (None) |
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