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| Mirrors > Home > MPE Home > Th. List > Mathboxes > btwnsegle | Structured version Visualization version GIF version | ||
| Description: If 𝐵 falls between 𝐴 and 𝐶, then 𝐴𝐵 is no longer than 𝐴𝐶. (Contributed by Scott Fenton, 16-Oct-2013.) (Revised by Mario Carneiro, 19-Apr-2014.) |
| Ref | Expression |
|---|---|
| btwnsegle | ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → (𝐵 Btwn 〈𝐴, 𝐶〉 → 〈𝐴, 𝐵〉 Seg≤ 〈𝐴, 𝐶〉)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | simplr2 1217 | . . . 4 ⊢ (((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) ∧ 𝐵 Btwn 〈𝐴, 𝐶〉) → 𝐵 ∈ (𝔼‘𝑁)) | |
| 2 | simpr 484 | . . . 4 ⊢ (((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) ∧ 𝐵 Btwn 〈𝐴, 𝐶〉) → 𝐵 Btwn 〈𝐴, 𝐶〉) | |
| 3 | simpl 482 | . . . . . 6 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → 𝑁 ∈ ℕ) | |
| 4 | simpr1 1195 | . . . . . 6 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → 𝐴 ∈ (𝔼‘𝑁)) | |
| 5 | simpr2 1196 | . . . . . 6 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → 𝐵 ∈ (𝔼‘𝑁)) | |
| 6 | 3, 4, 5 | cgrrflxd 36053 | . . . . 5 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → 〈𝐴, 𝐵〉Cgr〈𝐴, 𝐵〉) |
| 7 | 6 | adantr 480 | . . . 4 ⊢ (((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) ∧ 𝐵 Btwn 〈𝐴, 𝐶〉) → 〈𝐴, 𝐵〉Cgr〈𝐴, 𝐵〉) |
| 8 | breq1 5096 | . . . . . 6 ⊢ (𝑥 = 𝐵 → (𝑥 Btwn 〈𝐴, 𝐶〉 ↔ 𝐵 Btwn 〈𝐴, 𝐶〉)) | |
| 9 | opeq2 4825 | . . . . . . 7 ⊢ (𝑥 = 𝐵 → 〈𝐴, 𝑥〉 = 〈𝐴, 𝐵〉) | |
| 10 | 9 | breq2d 5105 | . . . . . 6 ⊢ (𝑥 = 𝐵 → (〈𝐴, 𝐵〉Cgr〈𝐴, 𝑥〉 ↔ 〈𝐴, 𝐵〉Cgr〈𝐴, 𝐵〉)) |
| 11 | 8, 10 | anbi12d 632 | . . . . 5 ⊢ (𝑥 = 𝐵 → ((𝑥 Btwn 〈𝐴, 𝐶〉 ∧ 〈𝐴, 𝐵〉Cgr〈𝐴, 𝑥〉) ↔ (𝐵 Btwn 〈𝐴, 𝐶〉 ∧ 〈𝐴, 𝐵〉Cgr〈𝐴, 𝐵〉))) |
| 12 | 11 | rspcev 3573 | . . . 4 ⊢ ((𝐵 ∈ (𝔼‘𝑁) ∧ (𝐵 Btwn 〈𝐴, 𝐶〉 ∧ 〈𝐴, 𝐵〉Cgr〈𝐴, 𝐵〉)) → ∃𝑥 ∈ (𝔼‘𝑁)(𝑥 Btwn 〈𝐴, 𝐶〉 ∧ 〈𝐴, 𝐵〉Cgr〈𝐴, 𝑥〉)) |
| 13 | 1, 2, 7, 12 | syl12anc 836 | . . 3 ⊢ (((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) ∧ 𝐵 Btwn 〈𝐴, 𝐶〉) → ∃𝑥 ∈ (𝔼‘𝑁)(𝑥 Btwn 〈𝐴, 𝐶〉 ∧ 〈𝐴, 𝐵〉Cgr〈𝐴, 𝑥〉)) |
| 14 | simpr3 1197 | . . . . 5 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → 𝐶 ∈ (𝔼‘𝑁)) | |
| 15 | brsegle 36173 | . . . . 5 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁)) ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → (〈𝐴, 𝐵〉 Seg≤ 〈𝐴, 𝐶〉 ↔ ∃𝑥 ∈ (𝔼‘𝑁)(𝑥 Btwn 〈𝐴, 𝐶〉 ∧ 〈𝐴, 𝐵〉Cgr〈𝐴, 𝑥〉))) | |
| 16 | 3, 4, 5, 4, 14, 15 | syl122anc 1381 | . . . 4 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → (〈𝐴, 𝐵〉 Seg≤ 〈𝐴, 𝐶〉 ↔ ∃𝑥 ∈ (𝔼‘𝑁)(𝑥 Btwn 〈𝐴, 𝐶〉 ∧ 〈𝐴, 𝐵〉Cgr〈𝐴, 𝑥〉))) |
| 17 | 16 | adantr 480 | . . 3 ⊢ (((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) ∧ 𝐵 Btwn 〈𝐴, 𝐶〉) → (〈𝐴, 𝐵〉 Seg≤ 〈𝐴, 𝐶〉 ↔ ∃𝑥 ∈ (𝔼‘𝑁)(𝑥 Btwn 〈𝐴, 𝐶〉 ∧ 〈𝐴, 𝐵〉Cgr〈𝐴, 𝑥〉))) |
| 18 | 13, 17 | mpbird 257 | . 2 ⊢ (((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) ∧ 𝐵 Btwn 〈𝐴, 𝐶〉) → 〈𝐴, 𝐵〉 Seg≤ 〈𝐴, 𝐶〉) |
| 19 | 18 | ex 412 | 1 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → (𝐵 Btwn 〈𝐴, 𝐶〉 → 〈𝐴, 𝐵〉 Seg≤ 〈𝐴, 𝐶〉)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 ∧ w3a 1086 = wceq 1541 ∈ wcel 2113 ∃wrex 3057 〈cop 4581 class class class wbr 5093 ‘cfv 6486 ℕcn 12132 𝔼cee 28867 Btwn cbtwn 28868 Cgrccgr 28869 Seg≤ csegle 36171 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-10 2146 ax-11 2162 ax-12 2182 ax-ext 2705 ax-sep 5236 ax-nul 5246 ax-pow 5305 ax-pr 5372 ax-un 7674 ax-cnex 11069 ax-resscn 11070 ax-1cn 11071 ax-icn 11072 ax-addcl 11073 ax-addrcl 11074 ax-mulcl 11075 ax-mulrcl 11076 ax-mulcom 11077 ax-addass 11078 ax-mulass 11079 ax-distr 11080 ax-i2m1 11081 ax-1ne0 11082 ax-1rid 11083 ax-rnegex 11084 ax-rrecex 11085 ax-cnre 11086 ax-pre-lttri 11087 ax-pre-lttrn 11088 ax-pre-ltadd 11089 ax-pre-mulgt0 11090 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2537 df-eu 2566 df-clab 2712 df-cleq 2725 df-clel 2808 df-nfc 2882 df-ne 2930 df-nel 3034 df-ral 3049 df-rex 3058 df-reu 3348 df-rab 3397 df-v 3439 df-sbc 3738 df-csb 3847 df-dif 3901 df-un 3903 df-in 3905 df-ss 3915 df-pss 3918 df-nul 4283 df-if 4475 df-pw 4551 df-sn 4576 df-pr 4578 df-op 4582 df-uni 4859 df-iun 4943 df-br 5094 df-opab 5156 df-mpt 5175 df-tr 5201 df-id 5514 df-eprel 5519 df-po 5527 df-so 5528 df-fr 5572 df-we 5574 df-xp 5625 df-rel 5626 df-cnv 5627 df-co 5628 df-dm 5629 df-rn 5630 df-res 5631 df-ima 5632 df-pred 6253 df-ord 6314 df-on 6315 df-lim 6316 df-suc 6317 df-iota 6442 df-fun 6488 df-fn 6489 df-f 6490 df-f1 6491 df-fo 6492 df-f1o 6493 df-fv 6494 df-riota 7309 df-ov 7355 df-oprab 7356 df-mpo 7357 df-om 7803 df-1st 7927 df-2nd 7928 df-frecs 8217 df-wrecs 8248 df-recs 8297 df-rdg 8335 df-er 8628 df-map 8758 df-en 8876 df-dom 8877 df-sdom 8878 df-pnf 11155 df-mnf 11156 df-xr 11157 df-ltxr 11158 df-le 11159 df-sub 11353 df-neg 11354 df-nn 12133 df-2 12195 df-n0 12389 df-z 12476 df-uz 12739 df-fz 13410 df-seq 13911 df-exp 13971 df-sum 15596 df-ee 28870 df-cgr 28872 df-segle 36172 |
| This theorem is referenced by: colinbtwnle 36183 outsidele 36197 |
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