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| Mirrors > Home > MPE Home > Th. List > 0pth | Structured version Visualization version GIF version | ||
| Description: A pair of an empty set (of edges) and a second set (of vertices) is a path iff the second set contains exactly one vertex. (Contributed by Alexander van der Vekens, 30-Oct-2017.) (Revised by AV, 19-Jan-2021.) (Revised by AV, 30-Oct-2021.) |
| Ref | Expression |
|---|---|
| 0pth.v | ⊢ 𝑉 = (Vtx‘𝐺) |
| Ref | Expression |
|---|---|
| 0pth | ⊢ (𝐺 ∈ 𝑊 → (∅(Paths‘𝐺)𝑃 ↔ 𝑃:(0...0)⟶𝑉)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ispth 30171 | . . 3 ⊢ (∅(Paths‘𝐺)𝑃 ↔ (∅(Trails‘𝐺)𝑃 ∧ Fun ◡(𝑃 ↾ (1..^(♯‘∅))) ∧ ((𝑃 “ {0, (♯‘∅)}) ∩ (𝑃 “ (1..^(♯‘∅)))) = ∅)) | |
| 2 | 1 | a1i 11 | . 2 ⊢ (𝐺 ∈ 𝑊 → (∅(Paths‘𝐺)𝑃 ↔ (∅(Trails‘𝐺)𝑃 ∧ Fun ◡(𝑃 ↾ (1..^(♯‘∅))) ∧ ((𝑃 “ {0, (♯‘∅)}) ∩ (𝑃 “ (1..^(♯‘∅)))) = ∅))) |
| 3 | 3anass 1111 | . . . 4 ⊢ ((∅(Trails‘𝐺)𝑃 ∧ Fun ◡(𝑃 ↾ (1..^(♯‘∅))) ∧ ((𝑃 “ {0, (♯‘∅)}) ∩ (𝑃 “ (1..^(♯‘∅)))) = ∅) ↔ (∅(Trails‘𝐺)𝑃 ∧ (Fun ◡(𝑃 ↾ (1..^(♯‘∅))) ∧ ((𝑃 “ {0, (♯‘∅)}) ∩ (𝑃 “ (1..^(♯‘∅)))) = ∅))) | |
| 4 | 3 | a1i 11 | . . 3 ⊢ (𝐺 ∈ 𝑊 → ((∅(Trails‘𝐺)𝑃 ∧ Fun ◡(𝑃 ↾ (1..^(♯‘∅))) ∧ ((𝑃 “ {0, (♯‘∅)}) ∩ (𝑃 “ (1..^(♯‘∅)))) = ∅) ↔ (∅(Trails‘𝐺)𝑃 ∧ (Fun ◡(𝑃 ↾ (1..^(♯‘∅))) ∧ ((𝑃 “ {0, (♯‘∅)}) ∩ (𝑃 “ (1..^(♯‘∅)))) = ∅)))) |
| 5 | funcnv0 6603 | . . . . . 6 ⊢ Fun ◡∅ | |
| 6 | hash0 14433 | . . . . . . . . . . . 12 ⊢ (♯‘∅) = 0 | |
| 7 | 0le1 11764 | . . . . . . . . . . . 12 ⊢ 0 ≤ 1 | |
| 8 | 6, 7 | eqbrtri 5130 | . . . . . . . . . . 11 ⊢ (♯‘∅) ≤ 1 |
| 9 | 1z 12651 | . . . . . . . . . . . 12 ⊢ 1 ∈ ℤ | |
| 10 | 0z 12629 | . . . . . . . . . . . . 13 ⊢ 0 ∈ ℤ | |
| 11 | 6, 10 | eqeltri 2858 | . . . . . . . . . . . 12 ⊢ (♯‘∅) ∈ ℤ |
| 12 | fzon 13738 | . . . . . . . . . . . 12 ⊢ ((1 ∈ ℤ ∧ (♯‘∅) ∈ ℤ) → ((♯‘∅) ≤ 1 ↔ (1..^(♯‘∅)) = ∅)) | |
| 13 | 9, 11, 12 | mp2an 705 | . . . . . . . . . . 11 ⊢ ((♯‘∅) ≤ 1 ↔ (1..^(♯‘∅)) = ∅) |
| 14 | 8, 13 | mpbi 233 | . . . . . . . . . 10 ⊢ (1..^(♯‘∅)) = ∅ |
| 15 | 14 | reseq2i 5973 | . . . . . . . . 9 ⊢ (𝑃 ↾ (1..^(♯‘∅))) = (𝑃 ↾ ∅) |
| 16 | res0 5980 | . . . . . . . . 9 ⊢ (𝑃 ↾ ∅) = ∅ | |
| 17 | 15, 16 | eqtri 2785 | . . . . . . . 8 ⊢ (𝑃 ↾ (1..^(♯‘∅))) = ∅ |
| 18 | 17 | cnveqi 5858 | . . . . . . 7 ⊢ ◡(𝑃 ↾ (1..^(♯‘∅))) = ◡∅ |
| 19 | 18 | funeqi 6558 | . . . . . 6 ⊢ (Fun ◡(𝑃 ↾ (1..^(♯‘∅))) ↔ Fun ◡∅) |
| 20 | 5, 19 | mpbir 234 | . . . . 5 ⊢ Fun ◡(𝑃 ↾ (1..^(♯‘∅))) |
| 21 | 14 | imaeq2i 6058 | . . . . . . . 8 ⊢ (𝑃 “ (1..^(♯‘∅))) = (𝑃 “ ∅) |
| 22 | ima0 6077 | . . . . . . . 8 ⊢ (𝑃 “ ∅) = ∅ | |
| 23 | 21, 22 | eqtri 2785 | . . . . . . 7 ⊢ (𝑃 “ (1..^(♯‘∅))) = ∅ |
| 24 | 23 | ineq2i 4166 | . . . . . 6 ⊢ ((𝑃 “ {0, (♯‘∅)}) ∩ (𝑃 “ (1..^(♯‘∅)))) = ((𝑃 “ {0, (♯‘∅)}) ∩ ∅) |
| 25 | in0 4348 | . . . . . 6 ⊢ ((𝑃 “ {0, (♯‘∅)}) ∩ ∅) = ∅ | |
| 26 | 24, 25 | eqtri 2785 | . . . . 5 ⊢ ((𝑃 “ {0, (♯‘∅)}) ∩ (𝑃 “ (1..^(♯‘∅)))) = ∅ |
| 27 | 20, 26 | pm3.2i 476 | . . . 4 ⊢ (Fun ◡(𝑃 ↾ (1..^(♯‘∅))) ∧ ((𝑃 “ {0, (♯‘∅)}) ∩ (𝑃 “ (1..^(♯‘∅)))) = ∅) |
| 28 | 27 | biantru 539 | . . 3 ⊢ (∅(Trails‘𝐺)𝑃 ↔ (∅(Trails‘𝐺)𝑃 ∧ (Fun ◡(𝑃 ↾ (1..^(♯‘∅))) ∧ ((𝑃 “ {0, (♯‘∅)}) ∩ (𝑃 “ (1..^(♯‘∅)))) = ∅))) |
| 29 | 4, 28 | bitr4di 292 | . 2 ⊢ (𝐺 ∈ 𝑊 → ((∅(Trails‘𝐺)𝑃 ∧ Fun ◡(𝑃 ↾ (1..^(♯‘∅))) ∧ ((𝑃 “ {0, (♯‘∅)}) ∩ (𝑃 “ (1..^(♯‘∅)))) = ∅) ↔ ∅(Trails‘𝐺)𝑃)) |
| 30 | 0pth.v | . . 3 ⊢ 𝑉 = (Vtx‘𝐺) | |
| 31 | 30 | 0trl 30578 | . 2 ⊢ (𝐺 ∈ 𝑊 → (∅(Trails‘𝐺)𝑃 ↔ 𝑃:(0...0)⟶𝑉)) |
| 32 | 2, 29, 31 | 3bitrd 308 | 1 ⊢ (𝐺 ∈ 𝑊 → (∅(Paths‘𝐺)𝑃 ↔ 𝑃:(0...0)⟶𝑉)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ wa 401 ∧ w3a 1103 = wceq 1570 ∈ wcel 2145 ∩ cin 3901 ∅c0 4282 {cpr 4589 class class class wbr 5107 ◡ccnv 5658 ↾ cres 5661 “ cima 5662 Fun wfun 6531 ⟶wf 6533 ‘cfv 6537 (class class class)co 7416 0cc0 11127 1c1 11128 ≤ cle 11271 ℤcz 12618 ...cfz 13563 ..^cfzo 13711 ♯chash 14396 Vtxcvtx 29439 Trailsctrls 30138 Pathscpths 30160 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2215 ax-ext 2734 ax-rep 5236 ax-sep 5255 ax-nul 5267 ax-pow 5334 ax-pr 5402 ax-un 7739 ax-cnex 11183 ax-resscn 11184 ax-1cn 11185 ax-icn 11186 ax-addcl 11187 ax-addrcl 11188 ax-mulcl 11189 ax-mulrcl 11190 ax-mulcom 11191 ax-addass 11192 ax-mulass 11193 ax-distr 11194 ax-i2m1 11195 ax-1ne0 11196 ax-1rid 11197 ax-rnegex 11198 ax-rrecex 11199 ax-cnre 11200 ax-pre-lttri 11201 ax-pre-lttrn 11202 ax-pre-ltadd 11203 ax-pre-mulgt0 11204 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-ifp 1079 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2566 df-eu 2596 df-clab 2741 df-cleq 2754 df-clel 2837 df-nfc 2911 df-ne 2958 df-nel 3064 df-ral 3079 df-rex 3089 df-reu 3368 df-rab 3415 df-v 3455 df-sbc 3743 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-pss 3922 df-nul 4283 df-if 4486 df-pw 4562 df-sn 4588 df-pr 4590 df-op 4594 df-uni 4871 df-int 4911 df-iun 4956 df-br 5108 df-opab 5172 df-mpt 5191 df-tr 5217 df-id 5554 df-eprel 5559 df-po 5567 df-so 5568 df-fr 5612 df-we 5614 df-xp 5665 df-rel 5666 df-cnv 5667 df-co 5668 df-dm 5669 df-rn 5670 df-res 5671 df-ima 5672 df-pred 6303 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6493 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-riota 7373 df-ov 7419 df-oprab 7420 df-mpo 7421 df-om 7866 df-1st 7989 df-2nd 7990 df-frecs 8283 df-wrecs 8314 df-recs 8363 df-rdg 8402 df-1o 8458 df-er 8699 df-map 8831 df-pm 8832 df-en 8956 df-dom 8957 df-sdom 8958 df-fin 8959 df-card 9947 df-pnf 11272 df-mnf 11273 df-xr 11274 df-ltxr 11275 df-le 11276 df-sub 11470 df-neg 11471 df-nn 12261 df-n0 12532 df-z 12619 df-uz 12891 df-fz 13564 df-fzo 13712 df-hash 14397 df-word 14581 df-wlks 30045 df-trls 30140 df-pths 30164 |
| This theorem is used by: 0pthon 30583 0cycl 30590 |
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