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Mirrors > Home > MPE Home > Th. List > wspniunwspnon | Structured version Visualization version GIF version |
Description: The set of nonempty simple paths of fixed length is the double union of the simple paths of the fixed length between different vertices. (Contributed by Alexander van der Vekens, 3-Mar-2018.) (Revised by AV, 16-May-2021.) (Proof shortened by AV, 15-Mar-2022.) |
Ref | Expression |
---|---|
wspniunwspnon.v | ⊢ 𝑉 = (Vtx‘𝐺) |
Ref | Expression |
---|---|
wspniunwspnon | ⊢ ((𝑁 ∈ ℕ ∧ 𝐺 ∈ 𝑈) → (𝑁 WSPathsN 𝐺) = ∪ 𝑥 ∈ 𝑉 ∪ 𝑦 ∈ (𝑉 ∖ {𝑥})(𝑥(𝑁 WSPathsNOn 𝐺)𝑦)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | wspthsnonn0vne 28639 | . . . . . . . . . . . . 13 ⊢ ((𝑁 ∈ ℕ ∧ (𝑥(𝑁 WSPathsNOn 𝐺)𝑦) ≠ ∅) → 𝑥 ≠ 𝑦) | |
2 | 1 | ex 414 | . . . . . . . . . . . 12 ⊢ (𝑁 ∈ ℕ → ((𝑥(𝑁 WSPathsNOn 𝐺)𝑦) ≠ ∅ → 𝑥 ≠ 𝑦)) |
3 | 2 | adantr 482 | . . . . . . . . . . 11 ⊢ ((𝑁 ∈ ℕ ∧ 𝐺 ∈ 𝑈) → ((𝑥(𝑁 WSPathsNOn 𝐺)𝑦) ≠ ∅ → 𝑥 ≠ 𝑦)) |
4 | ne0i 4292 | . . . . . . . . . . 11 ⊢ (𝑤 ∈ (𝑥(𝑁 WSPathsNOn 𝐺)𝑦) → (𝑥(𝑁 WSPathsNOn 𝐺)𝑦) ≠ ∅) | |
5 | 3, 4 | impel 507 | . . . . . . . . . 10 ⊢ (((𝑁 ∈ ℕ ∧ 𝐺 ∈ 𝑈) ∧ 𝑤 ∈ (𝑥(𝑁 WSPathsNOn 𝐺)𝑦)) → 𝑥 ≠ 𝑦) |
6 | 5 | necomd 2997 | . . . . . . . . 9 ⊢ (((𝑁 ∈ ℕ ∧ 𝐺 ∈ 𝑈) ∧ 𝑤 ∈ (𝑥(𝑁 WSPathsNOn 𝐺)𝑦)) → 𝑦 ≠ 𝑥) |
7 | 6 | ex 414 | . . . . . . . 8 ⊢ ((𝑁 ∈ ℕ ∧ 𝐺 ∈ 𝑈) → (𝑤 ∈ (𝑥(𝑁 WSPathsNOn 𝐺)𝑦) → 𝑦 ≠ 𝑥)) |
8 | 7 | pm4.71rd 564 | . . . . . . 7 ⊢ ((𝑁 ∈ ℕ ∧ 𝐺 ∈ 𝑈) → (𝑤 ∈ (𝑥(𝑁 WSPathsNOn 𝐺)𝑦) ↔ (𝑦 ≠ 𝑥 ∧ 𝑤 ∈ (𝑥(𝑁 WSPathsNOn 𝐺)𝑦)))) |
9 | 8 | rexbidv 3173 | . . . . . 6 ⊢ ((𝑁 ∈ ℕ ∧ 𝐺 ∈ 𝑈) → (∃𝑦 ∈ 𝑉 𝑤 ∈ (𝑥(𝑁 WSPathsNOn 𝐺)𝑦) ↔ ∃𝑦 ∈ 𝑉 (𝑦 ≠ 𝑥 ∧ 𝑤 ∈ (𝑥(𝑁 WSPathsNOn 𝐺)𝑦)))) |
10 | rexdifsn 4752 | . . . . . 6 ⊢ (∃𝑦 ∈ (𝑉 ∖ {𝑥})𝑤 ∈ (𝑥(𝑁 WSPathsNOn 𝐺)𝑦) ↔ ∃𝑦 ∈ 𝑉 (𝑦 ≠ 𝑥 ∧ 𝑤 ∈ (𝑥(𝑁 WSPathsNOn 𝐺)𝑦))) | |
11 | 9, 10 | bitr4di 289 | . . . . 5 ⊢ ((𝑁 ∈ ℕ ∧ 𝐺 ∈ 𝑈) → (∃𝑦 ∈ 𝑉 𝑤 ∈ (𝑥(𝑁 WSPathsNOn 𝐺)𝑦) ↔ ∃𝑦 ∈ (𝑉 ∖ {𝑥})𝑤 ∈ (𝑥(𝑁 WSPathsNOn 𝐺)𝑦))) |
12 | 11 | rexbidv 3173 | . . . 4 ⊢ ((𝑁 ∈ ℕ ∧ 𝐺 ∈ 𝑈) → (∃𝑥 ∈ 𝑉 ∃𝑦 ∈ 𝑉 𝑤 ∈ (𝑥(𝑁 WSPathsNOn 𝐺)𝑦) ↔ ∃𝑥 ∈ 𝑉 ∃𝑦 ∈ (𝑉 ∖ {𝑥})𝑤 ∈ (𝑥(𝑁 WSPathsNOn 𝐺)𝑦))) |
13 | wspniunwspnon.v | . . . . 5 ⊢ 𝑉 = (Vtx‘𝐺) | |
14 | 13 | wspthsnwspthsnon 28638 | . . . 4 ⊢ (𝑤 ∈ (𝑁 WSPathsN 𝐺) ↔ ∃𝑥 ∈ 𝑉 ∃𝑦 ∈ 𝑉 𝑤 ∈ (𝑥(𝑁 WSPathsNOn 𝐺)𝑦)) |
15 | vex 3447 | . . . . 5 ⊢ 𝑤 ∈ V | |
16 | eleq1w 2820 | . . . . . . 7 ⊢ (𝑝 = 𝑤 → (𝑝 ∈ (𝑥(𝑁 WSPathsNOn 𝐺)𝑦) ↔ 𝑤 ∈ (𝑥(𝑁 WSPathsNOn 𝐺)𝑦))) | |
17 | 16 | rexbidv 3173 | . . . . . 6 ⊢ (𝑝 = 𝑤 → (∃𝑦 ∈ (𝑉 ∖ {𝑥})𝑝 ∈ (𝑥(𝑁 WSPathsNOn 𝐺)𝑦) ↔ ∃𝑦 ∈ (𝑉 ∖ {𝑥})𝑤 ∈ (𝑥(𝑁 WSPathsNOn 𝐺)𝑦))) |
18 | 17 | rexbidv 3173 | . . . . 5 ⊢ (𝑝 = 𝑤 → (∃𝑥 ∈ 𝑉 ∃𝑦 ∈ (𝑉 ∖ {𝑥})𝑝 ∈ (𝑥(𝑁 WSPathsNOn 𝐺)𝑦) ↔ ∃𝑥 ∈ 𝑉 ∃𝑦 ∈ (𝑉 ∖ {𝑥})𝑤 ∈ (𝑥(𝑁 WSPathsNOn 𝐺)𝑦))) |
19 | 15, 18 | elab 3628 | . . . 4 ⊢ (𝑤 ∈ {𝑝 ∣ ∃𝑥 ∈ 𝑉 ∃𝑦 ∈ (𝑉 ∖ {𝑥})𝑝 ∈ (𝑥(𝑁 WSPathsNOn 𝐺)𝑦)} ↔ ∃𝑥 ∈ 𝑉 ∃𝑦 ∈ (𝑉 ∖ {𝑥})𝑤 ∈ (𝑥(𝑁 WSPathsNOn 𝐺)𝑦)) |
20 | 12, 14, 19 | 3bitr4g 314 | . . 3 ⊢ ((𝑁 ∈ ℕ ∧ 𝐺 ∈ 𝑈) → (𝑤 ∈ (𝑁 WSPathsN 𝐺) ↔ 𝑤 ∈ {𝑝 ∣ ∃𝑥 ∈ 𝑉 ∃𝑦 ∈ (𝑉 ∖ {𝑥})𝑝 ∈ (𝑥(𝑁 WSPathsNOn 𝐺)𝑦)})) |
21 | 20 | eqrdv 2735 | . 2 ⊢ ((𝑁 ∈ ℕ ∧ 𝐺 ∈ 𝑈) → (𝑁 WSPathsN 𝐺) = {𝑝 ∣ ∃𝑥 ∈ 𝑉 ∃𝑦 ∈ (𝑉 ∖ {𝑥})𝑝 ∈ (𝑥(𝑁 WSPathsNOn 𝐺)𝑦)}) |
22 | dfiunv2 4993 | . 2 ⊢ ∪ 𝑥 ∈ 𝑉 ∪ 𝑦 ∈ (𝑉 ∖ {𝑥})(𝑥(𝑁 WSPathsNOn 𝐺)𝑦) = {𝑝 ∣ ∃𝑥 ∈ 𝑉 ∃𝑦 ∈ (𝑉 ∖ {𝑥})𝑝 ∈ (𝑥(𝑁 WSPathsNOn 𝐺)𝑦)} | |
23 | 21, 22 | eqtr4di 2795 | 1 ⊢ ((𝑁 ∈ ℕ ∧ 𝐺 ∈ 𝑈) → (𝑁 WSPathsN 𝐺) = ∪ 𝑥 ∈ 𝑉 ∪ 𝑦 ∈ (𝑉 ∖ {𝑥})(𝑥(𝑁 WSPathsNOn 𝐺)𝑦)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 397 = wceq 1541 ∈ wcel 2106 {cab 2714 ≠ wne 2941 ∃wrex 3071 ∖ cdif 3905 ∅c0 4280 {csn 4584 ∪ ciun 4952 ‘cfv 6491 (class class class)co 7349 ℕcn 12086 Vtxcvtx 27724 WSPathsN cwwspthsn 28550 WSPathsNOn cwwspthsnon 28551 |
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 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2708 ax-rep 5240 ax-sep 5254 ax-nul 5261 ax-pow 5318 ax-pr 5382 ax-un 7662 ax-cnex 11040 ax-resscn 11041 ax-1cn 11042 ax-icn 11043 ax-addcl 11044 ax-addrcl 11045 ax-mulcl 11046 ax-mulrcl 11047 ax-mulcom 11048 ax-addass 11049 ax-mulass 11050 ax-distr 11051 ax-i2m1 11052 ax-1ne0 11053 ax-1rid 11054 ax-rnegex 11055 ax-rrecex 11056 ax-cnre 11057 ax-pre-lttri 11058 ax-pre-lttrn 11059 ax-pre-ltadd 11060 ax-pre-mulgt0 11061 |
This theorem depends on definitions: df-bi 206 df-an 398 df-or 846 df-ifp 1062 df-3or 1088 df-3an 1089 df-tru 1544 df-fal 1554 df-ex 1782 df-nf 1786 df-sb 2068 df-mo 2539 df-eu 2568 df-clab 2715 df-cleq 2729 df-clel 2815 df-nfc 2887 df-ne 2942 df-nel 3048 df-ral 3063 df-rex 3072 df-reu 3352 df-rab 3406 df-v 3445 df-sbc 3738 df-csb 3854 df-dif 3911 df-un 3913 df-in 3915 df-ss 3925 df-pss 3927 df-nul 4281 df-if 4485 df-pw 4560 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4864 df-int 4906 df-iun 4954 df-br 5104 df-opab 5166 df-mpt 5187 df-tr 5221 df-id 5528 df-eprel 5534 df-po 5542 df-so 5543 df-fr 5585 df-we 5587 df-xp 5636 df-rel 5637 df-cnv 5638 df-co 5639 df-dm 5640 df-rn 5641 df-res 5642 df-ima 5643 df-pred 6249 df-ord 6316 df-on 6317 df-lim 6318 df-suc 6319 df-iota 6443 df-fun 6493 df-fn 6494 df-f 6495 df-f1 6496 df-fo 6497 df-f1o 6498 df-fv 6499 df-riota 7305 df-ov 7352 df-oprab 7353 df-mpo 7354 df-om 7793 df-1st 7911 df-2nd 7912 df-frecs 8179 df-wrecs 8210 df-recs 8284 df-rdg 8323 df-1o 8379 df-er 8581 df-map 8700 df-en 8817 df-dom 8818 df-sdom 8819 df-fin 8820 df-card 9808 df-pnf 11124 df-mnf 11125 df-xr 11126 df-ltxr 11127 df-le 11128 df-sub 11320 df-neg 11321 df-nn 12087 df-n0 12347 df-z 12433 df-uz 12696 df-fz 13353 df-fzo 13496 df-hash 14158 df-word 14330 df-wlks 28324 df-wlkson 28325 df-trls 28417 df-trlson 28418 df-pths 28441 df-spths 28442 df-spthson 28444 df-wwlks 28552 df-wwlksn 28553 df-wwlksnon 28554 df-wspthsn 28555 df-wspthsnon 28556 |
This theorem is referenced by: frgrhash2wsp 29053 |
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