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| Mirrors > Home > MPE Home > Th. List > Mathboxes > seglemin | Structured version Visualization version GIF version | ||
| Description: Any segment is at least as long as a degenerate segment. Theorem 5.11 of [Schwabhauser] p. 42. (Contributed by Scott Fenton, 11-Oct-2013.) |
| Ref | Expression |
|---|---|
| seglemin | ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → 〈𝐴, 𝐴〉 Seg≤ 〈𝐵, 𝐶〉) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | simpr2 1212 | . . 3 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → 𝐵 ∈ (𝔼‘𝑁)) | |
| 2 | btwntriv1 36403 | . . . 4 ⊢ ((𝑁 ∈ ℕ ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁)) → 𝐵 Btwn 〈𝐵, 𝐶〉) | |
| 3 | 2 | 3adant3r1 1199 | . . 3 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → 𝐵 Btwn 〈𝐵, 𝐶〉) |
| 4 | cgrtriv 36389 | . . . 4 ⊢ ((𝑁 ∈ ℕ ∧ 𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁)) → 〈𝐴, 𝐴〉Cgr〈𝐵, 𝐵〉) | |
| 5 | 4 | 3adant3r3 1201 | . . 3 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → 〈𝐴, 𝐴〉Cgr〈𝐵, 𝐵〉) |
| 6 | breq1 5113 | . . . . 5 ⊢ (𝑦 = 𝐵 → (𝑦 Btwn 〈𝐵, 𝐶〉 ↔ 𝐵 Btwn 〈𝐵, 𝐶〉)) | |
| 7 | opeq2 4840 | . . . . . 6 ⊢ (𝑦 = 𝐵 → 〈𝐵, 𝑦〉 = 〈𝐵, 𝐵〉) | |
| 8 | 7 | breq2d 5122 | . . . . 5 ⊢ (𝑦 = 𝐵 → (〈𝐴, 𝐴〉Cgr〈𝐵, 𝑦〉 ↔ 〈𝐴, 𝐴〉Cgr〈𝐵, 𝐵〉)) |
| 9 | 6, 8 | anbi12d 643 | . . . 4 ⊢ (𝑦 = 𝐵 → ((𝑦 Btwn 〈𝐵, 𝐶〉 ∧ 〈𝐴, 𝐴〉Cgr〈𝐵, 𝑦〉) ↔ (𝐵 Btwn 〈𝐵, 𝐶〉 ∧ 〈𝐴, 𝐴〉Cgr〈𝐵, 𝐵〉))) |
| 10 | 9 | rspcev 3590 | . . 3 ⊢ ((𝐵 ∈ (𝔼‘𝑁) ∧ (𝐵 Btwn 〈𝐵, 𝐶〉 ∧ 〈𝐴, 𝐴〉Cgr〈𝐵, 𝐵〉)) → ∃𝑦 ∈ (𝔼‘𝑁)(𝑦 Btwn 〈𝐵, 𝐶〉 ∧ 〈𝐴, 𝐴〉Cgr〈𝐵, 𝑦〉)) |
| 11 | 1, 3, 5, 10 | syl12anc 849 | . 2 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → ∃𝑦 ∈ (𝔼‘𝑁)(𝑦 Btwn 〈𝐵, 𝐶〉 ∧ 〈𝐴, 𝐴〉Cgr〈𝐵, 𝑦〉)) |
| 12 | simpl 487 | . . 3 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → 𝑁 ∈ ℕ) | |
| 13 | simpr1 1211 | . . 3 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → 𝐴 ∈ (𝔼‘𝑁)) | |
| 14 | simpr3 1213 | . . 3 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → 𝐶 ∈ (𝔼‘𝑁)) | |
| 15 | brsegle 36495 | . . 3 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐴 ∈ (𝔼‘𝑁)) ∧ (𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → (〈𝐴, 𝐴〉 Seg≤ 〈𝐵, 𝐶〉 ↔ ∃𝑦 ∈ (𝔼‘𝑁)(𝑦 Btwn 〈𝐵, 𝐶〉 ∧ 〈𝐴, 𝐴〉Cgr〈𝐵, 𝑦〉))) | |
| 16 | 12, 13, 13, 1, 14, 15 | syl122anc 1404 | . 2 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → (〈𝐴, 𝐴〉 Seg≤ 〈𝐵, 𝐶〉 ↔ ∃𝑦 ∈ (𝔼‘𝑁)(𝑦 Btwn 〈𝐵, 𝐶〉 ∧ 〈𝐴, 𝐴〉Cgr〈𝐵, 𝑦〉))) |
| 17 | 11, 16 | mpbird 260 | 1 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → 〈𝐴, 𝐴〉 Seg≤ 〈𝐵, 𝐶〉) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 209 ∧ wa 400 ∧ w3a 1101 = wceq 1567 ∈ wcel 2149 ∃wrex 3095 〈cop 4597 class class class wbr 5110 ‘cfv 6533 ℕcn 12229 𝔼cee 29174 Btwn cbtwn 29175 Cgrccgr 29176 Seg≤ csegle 36493 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1822 ax-4 1836 ax-5 1937 ax-6 1994 ax-7 2035 ax-8 2151 ax-9 2159 ax-10 2182 ax-11 2198 ax-12 2219 ax-ext 2741 ax-rep 5239 ax-sep 5258 ax-nul 5268 ax-pow 5334 ax-pr 5402 ax-un 7730 ax-inf2 9606 ax-cnex 11152 ax-resscn 11153 ax-1cn 11154 ax-icn 11155 ax-addcl 11156 ax-addrcl 11157 ax-mulcl 11158 ax-mulrcl 11159 ax-mulcom 11160 ax-addass 11161 ax-mulass 11162 ax-distr 11163 ax-i2m1 11164 ax-1ne0 11165 ax-1rid 11166 ax-rnegex 11167 ax-rrecex 11168 ax-cnre 11169 ax-pre-lttri 11170 ax-pre-lttrn 11171 ax-pre-ltadd 11172 ax-pre-mulgt0 11173 ax-pre-sup 11174 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1102 df-3an 1103 df-tru 1570 df-fal 1580 df-ex 1807 df-nf 1811 df-sb 2098 df-mo 2573 df-eu 2603 df-clab 2748 df-cleq 2761 df-clel 2844 df-nfc 2918 df-ne 2965 df-nel 3071 df-ral 3086 df-rex 3096 df-rmo 3376 df-reu 3377 df-rab 3424 df-v 3465 df-sbc 3754 df-csb 3862 df-dif 3916 df-un 3918 df-in 3920 df-ss 3930 df-pss 3933 df-nul 4295 df-if 4490 df-pw 4566 df-sn 4592 df-pr 4594 df-op 4598 df-uni 4874 df-int 4914 df-iun 4959 df-br 5111 df-opab 5175 df-mpt 5194 df-tr 5220 df-id 5554 df-eprel 5559 df-po 5567 df-so 5568 df-fr 5612 df-se 5613 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 6299 df-ord 6360 df-on 6361 df-lim 6362 df-suc 6363 df-iota 6489 df-fun 6535 df-fn 6536 df-f 6537 df-f1 6538 df-fo 6539 df-f1o 6540 df-fv 6541 df-isom 6542 df-riota 7365 df-ov 7411 df-oprab 7412 df-mpo 7413 df-om 7859 df-1st 7982 df-2nd 7983 df-frecs 8274 df-wrecs 8305 df-recs 8354 df-rdg 8393 df-1o 8449 df-er 8690 df-map 8822 df-en 8940 df-dom 8941 df-sdom 8942 df-fin 8943 df-sup 9398 df-oi 9468 df-card 9921 df-pnf 11241 df-mnf 11242 df-xr 11243 df-ltxr 11244 df-le 11245 df-sub 11439 df-neg 11440 df-div 11868 df-nn 12230 df-2 12299 df-3 12300 df-n0 12501 df-z 12588 df-uz 12859 df-rp 13013 df-ico 13374 df-icc 13375 df-fz 13532 df-fzo 13679 df-seq 14034 df-exp 14094 df-hash 14363 df-cj 15146 df-re 15147 df-im 15148 df-sqrt 15282 df-abs 15283 df-clim 15535 df-sum 15734 df-ee 29177 df-btwn 29178 df-cgr 29179 df-segle 36494 |
| This theorem is referenced by: (None) |
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