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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 30305, 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 12576 | . . . . . 6 ⊢ 0 ∈ ℤ | |
| 2 | 1z 12598 | . . . . . 6 ⊢ 1 ∈ ℤ | |
| 3 | 1, 2, 1 | 3pm3.2i 1352 | . . . . 5 ⊢ (0 ∈ ℤ ∧ 1 ∈ ℤ ∧ 0 ∈ ℤ) |
| 4 | 0ne1 12286 | . . . . 5 ⊢ 0 ≠ 1 | |
| 5 | wlk2v2e.f | . . . . . . 7 ⊢ 𝐹 = 〈“00”〉 | |
| 6 | s2prop 14917 | . . . . . . . 8 ⊢ ((0 ∈ ℤ ∧ 0 ∈ ℤ) → 〈“00”〉 = {〈0, 0〉, 〈1, 0〉}) | |
| 7 | 1, 1, 6 | mp2an 702 | . . . . . . 7 ⊢ 〈“00”〉 = {〈0, 0〉, 〈1, 0〉} |
| 8 | 5, 7 | eqtri 2784 | . . . . . 6 ⊢ 𝐹 = {〈0, 0〉, 〈1, 0〉} |
| 9 | 8 | fpropnf1 7247 | . . . . 5 ⊢ (((0 ∈ ℤ ∧ 1 ∈ ℤ ∧ 0 ∈ ℤ) ∧ 0 ≠ 1) → (Fun 𝐹 ∧ ¬ Fun ◡𝐹)) |
| 10 | 3, 4, 9 | mp2an 702 | . . . 4 ⊢ (Fun 𝐹 ∧ ¬ Fun ◡𝐹) |
| 11 | 10 | simpri 489 | . . 3 ⊢ ¬ Fun ◡𝐹 |
| 12 | 11 | intnan 490 | . 2 ⊢ ¬ (𝐹(Walks‘𝐺)𝑃 ∧ Fun ◡𝐹) |
| 13 | istrl 29841 | . 2 ⊢ (𝐹(Trails‘𝐺)𝑃 ↔ (𝐹(Walks‘𝐺)𝑃 ∧ Fun ◡𝐹)) | |
| 14 | 12, 13 | mtbir 325 | 1 ⊢ ¬ 𝐹(Trails‘𝐺)𝑃 |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 ∧ wa 399 ∧ w3a 1097 = wceq 1559 ∈ wcel 2141 ≠ wne 2956 Vcvv 3453 {cpr 4583 〈cop 4587 class class class wbr 5099 ◡ccnv 5644 Fun wfun 6511 ‘cfv 6517 0cc0 11070 1c1 11071 ℤcz 12565 〈“cs1 14606 〈“cs2 14851 〈“cs3 14852 Walkscwlks 29743 Trailsctrls 29835 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1814 ax-4 1828 ax-5 1929 ax-6 1986 ax-7 2027 ax-8 2143 ax-9 2151 ax-10 2174 ax-11 2190 ax-12 2211 ax-ext 2733 ax-rep 5226 ax-sep 5245 ax-nul 5255 ax-pow 5321 ax-pr 5389 ax-un 7714 ax-cnex 11126 ax-resscn 11127 ax-1cn 11128 ax-icn 11129 ax-addcl 11130 ax-addrcl 11131 ax-mulcl 11132 ax-mulrcl 11133 ax-mulcom 11134 ax-addass 11135 ax-mulass 11136 ax-distr 11137 ax-i2m1 11138 ax-1ne0 11139 ax-1rid 11140 ax-rnegex 11141 ax-rrecex 11142 ax-cnre 11143 ax-pre-lttri 11144 ax-pre-lttrn 11145 ax-pre-ltadd 11146 ax-pre-mulgt0 11147 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3or 1098 df-3an 1099 df-tru 1562 df-fal 1572 df-ex 1799 df-nf 1803 df-sb 2090 df-mo 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-nel 3061 df-ral 3076 df-rex 3086 df-reu 3367 df-rab 3414 df-v 3455 df-sbc 3745 df-csb 3853 df-dif 3907 df-un 3909 df-in 3911 df-ss 3921 df-pss 3924 df-nul 4286 df-if 4480 df-pw 4556 df-sn 4582 df-pr 4584 df-op 4588 df-uni 4865 df-int 4905 df-iun 4950 df-br 5100 df-opab 5162 df-mpt 5181 df-tr 5207 df-id 5540 df-eprel 5545 df-po 5553 df-so 5554 df-fr 5598 df-we 5600 df-xp 5651 df-rel 5652 df-cnv 5653 df-co 5654 df-dm 5655 df-rn 5656 df-res 5657 df-ima 5658 df-pred 6284 df-ord 6345 df-on 6346 df-lim 6347 df-suc 6348 df-iota 6473 df-fun 6519 df-fn 6520 df-f 6521 df-f1 6522 df-fo 6523 df-f1o 6524 df-fv 6525 df-riota 7349 df-ov 7395 df-oprab 7396 df-mpo 7397 df-om 7843 df-1st 7966 df-2nd 7967 df-frecs 8257 df-wrecs 8288 df-recs 8337 df-rdg 8376 df-1o 8432 df-er 8673 df-en 8924 df-dom 8925 df-sdom 8926 df-fin 8927 df-card 9894 df-pnf 11215 df-mnf 11216 df-xr 11217 df-ltxr 11218 df-le 11219 df-sub 11413 df-neg 11414 df-nn 12208 df-n0 12479 df-z 12566 df-uz 12837 df-fz 13510 df-fzo 13657 df-hash 14341 df-word 14524 df-concat 14581 df-s1 14607 df-s2 14858 df-wlks 29746 df-trls 29837 |
| This theorem is referenced by: (None) |
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