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| Mirrors > Home > MPE Home > Th. List > ntrl2v2e | Structured version Visualization version GIF version | ||
| Description: A walk which is not a trail: In a graph with two vertices and one edge connecting these two vertices, to go from one vertex to the other and back to the first vertex via the same/only edge is a walk, see wlk2v2e 30763, but not a trail. Notice that 𝐺 is a simple graph (without loops) only if 𝑋 ≠ 𝑌. (Contributed by Alexander van der Vekens, 22-Oct-2017.) (Revised by AV, 8-Jan-2021.) (Proof shortened by AV, 30-Oct-2021.) |
| Ref | Expression |
|---|---|
| wlk2v2e.i | ⊢ 𝐼 = 〈“{𝑋, 𝑌}”〉 |
| wlk2v2e.f | ⊢ 𝐹 = 〈“00”〉 |
| wlk2v2e.x | ⊢ 𝑋 ∈ V |
| wlk2v2e.y | ⊢ 𝑌 ∈ V |
| wlk2v2e.p | ⊢ 𝑃 = 〈“𝑋𝑌𝑋”〉 |
| wlk2v2e.g | ⊢ 𝐺 = 〈{𝑋, 𝑌}, 𝐼〉 |
| Ref | Expression |
|---|---|
| ntrl2v2e | ⊢ ¬ 𝐹(Trails‘𝐺)𝑃 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0z 12707 | . . . . . 6 ⊢ 0 ∈ ℤ | |
| 2 | 1z 12729 | . . . . . 6 ⊢ 1 ∈ ℤ | |
| 3 | 1, 2, 1 | 3pm3.2i 1358 | . . . . 5 ⊢ (0 ∈ ℤ ∧ 1 ∈ ℤ ∧ 0 ∈ ℤ) |
| 4 | 0ne1 12417 | . . . . 5 ⊢ 0 ≠ 1 | |
| 5 | wlk2v2e.f | . . . . . . 7 ⊢ 𝐹 = 〈“00”〉 | |
| 6 | s2prop 15063 | . . . . . . . 8 ⊢ ((0 ∈ ℤ ∧ 0 ∈ ℤ) → 〈“00”〉 = {〈0, 0〉, 〈1, 0〉}) | |
| 7 | 1, 1, 6 | mp2an 705 | . . . . . . 7 ⊢ 〈“00”〉 = {〈0, 0〉, 〈1, 0〉} |
| 8 | 5, 7 | eqtri 2783 | . . . . . 6 ⊢ 𝐹 = {〈0, 0〉, 〈1, 0〉} |
| 9 | 8 | fpropnf1 7271 | . . . . 5 ⊢ (((0 ∈ ℤ ∧ 1 ∈ ℤ ∧ 0 ∈ ℤ) ∧ 0 ≠ 1) → (Fun 𝐹 ∧ ¬ Fun ◡𝐹)) |
| 10 | 3, 4, 9 | mp2an 705 | . . . 4 ⊢ (Fun 𝐹 ∧ ¬ Fun ◡𝐹) |
| 11 | 10 | simpri 491 | . . 3 ⊢ ¬ Fun ◡𝐹 |
| 12 | 11 | intnan 492 | . 2 ⊢ ¬ (𝐹(Walks‘𝐺)𝑃 ∧ Fun ◡𝐹) |
| 13 | istrl 30284 | . 2 ⊢ (𝐹(Trails‘𝐺)𝑃 ↔ (𝐹(Walks‘𝐺)𝑃 ∧ Fun ◡𝐹)) | |
| 14 | 12, 13 | mtbir 326 | 1 ⊢ ¬ 𝐹(Trails‘𝐺)𝑃 |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 ∧ wa 401 ∧ w3a 1103 = wceq 1569 ∈ wcel 2144 ≠ wne 2955 Vcvv 3450 {cpr 4586 〈cop 4834 class class class wbr 5102 ◡ccnv 5649 Fun wfun 6532 ‘cfv 6538 0cc0 11203 1c1 11204 ℤcz 12696 〈“cs1 14745 〈“cs2 14996 〈“cs3 14997 Walkscwlks 30182 Trailsctrls 30278 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-rep 5231 ax-sep 5248 ax-nul 5259 ax-pow 5326 ax-pr 5390 ax-un 7751 ax-cnex 11259 ax-resscn 11260 ax-1cn 11261 ax-icn 11262 ax-addcl 11263 ax-addrcl 11264 ax-mulcl 11265 ax-mulrcl 11266 ax-mulcom 11267 ax-addass 11268 ax-mulass 11269 ax-distr 11270 ax-i2m1 11271 ax-1ne0 11272 ax-1rid 11273 ax-rnegex 11274 ax-rrecex 11275 ax-cnre 11276 ax-pre-lttri 11277 ax-pre-lttrn 11278 ax-pre-ltadd 11279 ax-pre-mulgt0 11280 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-nel 3062 df-ral 3077 df-rex 3087 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3739 df-csb 3847 df-ss 3896 df-pss 4014 df-dif 4047 df-in 4091 df-un 4151 df-nul 4279 df-if 4482 df-pw 4558 df-sn 4585 df-pr 4587 df-op 4835 df-uni 4867 df-int 4907 df-iun 4952 df-br 5103 df-opab 5167 df-mpt 5186 df-tr 5212 df-id 5545 df-eprel 5550 df-po 5558 df-so 5559 df-fr 5603 df-we 5605 df-xp 5656 df-rel 5657 df-cnv 5658 df-co 5659 df-dm 5660 df-rn 5661 df-res 5662 df-ima 5663 df-pred 6304 df-ord 6365 df-on 6366 df-lim 6367 df-suc 6368 df-iota 6494 df-fun 6540 df-fn 6541 df-f 6542 df-f1 6543 df-fo 6544 df-f1o 6545 df-fv 6546 df-riota 7377 df-ov 7423 df-oprab 7424 df-mpo 7425 df-om 7878 df-1st 8001 df-2nd 8002 df-frecs 8302 df-wrecs 8333 df-recs 8382 df-rdg 8421 df-1o 8479 df-er 8720 df-en 8977 df-dom 8978 df-sdom 8979 df-fin 8980 df-card 10023 df-pnf 11348 df-mnf 11349 df-xr 11350 df-ltxr 11351 df-le 11352 df-sub 11546 df-neg 11547 df-nn 12339 df-n0 12610 df-z 12697 df-uz 12969 df-fz 13643 df-fzo 13792 df-hash 14478 df-word 14662 df-concat 14719 df-s1 14746 df-s2 15003 df-wlks 30185 df-trls 30280 |
| This theorem is used by: (None) |
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