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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 30242, 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 12526 | . . . . . 6 ⊢ 0 ∈ ℤ | |
| 2 | 1z 12548 | . . . . . 6 ⊢ 1 ∈ ℤ | |
| 3 | 1, 2, 1 | 3pm3.2i 1341 | . . . . 5 ⊢ (0 ∈ ℤ ∧ 1 ∈ ℤ ∧ 0 ∈ ℤ) |
| 4 | 0ne1 12243 | . . . . 5 ⊢ 0 ≠ 1 | |
| 5 | wlk2v2e.f | . . . . . . 7 ⊢ 𝐹 = 〈“00”〉 | |
| 6 | s2prop 14860 | . . . . . . . 8 ⊢ ((0 ∈ ℤ ∧ 0 ∈ ℤ) → 〈“00”〉 = {〈0, 0〉, 〈1, 0〉}) | |
| 7 | 1, 1, 6 | mp2an 693 | . . . . . . 7 ⊢ 〈“00”〉 = {〈0, 0〉, 〈1, 0〉} |
| 8 | 5, 7 | eqtri 2760 | . . . . . 6 ⊢ 𝐹 = {〈0, 0〉, 〈1, 0〉} |
| 9 | 8 | fpropnf1 7215 | . . . . 5 ⊢ (((0 ∈ ℤ ∧ 1 ∈ ℤ ∧ 0 ∈ ℤ) ∧ 0 ≠ 1) → (Fun 𝐹 ∧ ¬ Fun ◡𝐹)) |
| 10 | 3, 4, 9 | mp2an 693 | . . . 4 ⊢ (Fun 𝐹 ∧ ¬ Fun ◡𝐹) |
| 11 | 10 | simpri 485 | . . 3 ⊢ ¬ Fun ◡𝐹 |
| 12 | 11 | intnan 486 | . 2 ⊢ ¬ (𝐹(Walks‘𝐺)𝑃 ∧ Fun ◡𝐹) |
| 13 | istrl 29778 | . 2 ⊢ (𝐹(Trails‘𝐺)𝑃 ↔ (𝐹(Walks‘𝐺)𝑃 ∧ Fun ◡𝐹)) | |
| 14 | 12, 13 | mtbir 323 | 1 ⊢ ¬ 𝐹(Trails‘𝐺)𝑃 |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 ∧ wa 395 ∧ w3a 1087 = wceq 1542 ∈ wcel 2114 ≠ wne 2933 Vcvv 3430 {cpr 4570 〈cop 4574 class class class wbr 5086 ◡ccnv 5623 Fun wfun 6486 ‘cfv 6492 0cc0 11029 1c1 11030 ℤcz 12515 〈“cs1 14549 〈“cs2 14794 〈“cs3 14795 Walkscwlks 29680 Trailsctrls 29772 |
| 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-rep 5212 ax-sep 5231 ax-nul 5241 ax-pow 5302 ax-pr 5370 ax-un 7682 ax-cnex 11085 ax-resscn 11086 ax-1cn 11087 ax-icn 11088 ax-addcl 11089 ax-addrcl 11090 ax-mulcl 11091 ax-mulrcl 11092 ax-mulcom 11093 ax-addass 11094 ax-mulass 11095 ax-distr 11096 ax-i2m1 11097 ax-1ne0 11098 ax-1rid 11099 ax-rnegex 11100 ax-rrecex 11101 ax-cnre 11102 ax-pre-lttri 11103 ax-pre-lttrn 11104 ax-pre-ltadd 11105 ax-pre-mulgt0 11106 |
| 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-nel 3038 df-ral 3053 df-rex 3063 df-reu 3344 df-rab 3391 df-v 3432 df-sbc 3730 df-csb 3839 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-pss 3910 df-nul 4275 df-if 4468 df-pw 4544 df-sn 4569 df-pr 4571 df-op 4575 df-uni 4852 df-int 4891 df-iun 4936 df-br 5087 df-opab 5149 df-mpt 5168 df-tr 5194 df-id 5519 df-eprel 5524 df-po 5532 df-so 5533 df-fr 5577 df-we 5579 df-xp 5630 df-rel 5631 df-cnv 5632 df-co 5633 df-dm 5634 df-rn 5635 df-res 5636 df-ima 5637 df-pred 6259 df-ord 6320 df-on 6321 df-lim 6322 df-suc 6323 df-iota 6448 df-fun 6494 df-fn 6495 df-f 6496 df-f1 6497 df-fo 6498 df-f1o 6499 df-fv 6500 df-riota 7317 df-ov 7363 df-oprab 7364 df-mpo 7365 df-om 7811 df-1st 7935 df-2nd 7936 df-frecs 8224 df-wrecs 8255 df-recs 8304 df-rdg 8342 df-1o 8398 df-er 8636 df-en 8887 df-dom 8888 df-sdom 8889 df-fin 8890 df-card 9854 df-pnf 11172 df-mnf 11173 df-xr 11174 df-ltxr 11175 df-le 11176 df-sub 11370 df-neg 11371 df-nn 12166 df-n0 12429 df-z 12516 df-uz 12780 df-fz 13453 df-fzo 13600 df-hash 14284 df-word 14467 df-concat 14524 df-s1 14550 df-s2 14801 df-wlks 29683 df-trls 29774 |
| This theorem is referenced by: (None) |
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