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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 1208 | . . 3 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → 𝐵 ∈ (𝔼‘𝑁)) | |
| 2 | btwntriv1 36327 | . . . 4 ⊢ ((𝑁 ∈ ℕ ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁)) → 𝐵 Btwn 〈𝐵, 𝐶〉) | |
| 3 | 2 | 3adant3r1 1195 | . . 3 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → 𝐵 Btwn 〈𝐵, 𝐶〉) |
| 4 | cgrtriv 36313 | . . . 4 ⊢ ((𝑁 ∈ ℕ ∧ 𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁)) → 〈𝐴, 𝐴〉Cgr〈𝐵, 𝐵〉) | |
| 5 | 4 | 3adant3r3 1197 | . . 3 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → 〈𝐴, 𝐴〉Cgr〈𝐵, 𝐵〉) |
| 6 | breq1 5100 | . . . . 5 ⊢ (𝑦 = 𝐵 → (𝑦 Btwn 〈𝐵, 𝐶〉 ↔ 𝐵 Btwn 〈𝐵, 𝐶〉)) | |
| 7 | opeq2 4829 | . . . . . 6 ⊢ (𝑦 = 𝐵 → 〈𝐵, 𝑦〉 = 〈𝐵, 𝐵〉) | |
| 8 | 7 | breq2d 5109 | . . . . 5 ⊢ (𝑦 = 𝐵 → (〈𝐴, 𝐴〉Cgr〈𝐵, 𝑦〉 ↔ 〈𝐴, 𝐴〉Cgr〈𝐵, 𝐵〉)) |
| 9 | 6, 8 | anbi12d 641 | . . . 4 ⊢ (𝑦 = 𝐵 → ((𝑦 Btwn 〈𝐵, 𝐶〉 ∧ 〈𝐴, 𝐴〉Cgr〈𝐵, 𝑦〉) ↔ (𝐵 Btwn 〈𝐵, 𝐶〉 ∧ 〈𝐴, 𝐴〉Cgr〈𝐵, 𝐵〉))) |
| 10 | 9 | rspcev 3580 | . . 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 847 | . 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 486 | . . 3 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → 𝑁 ∈ ℕ) | |
| 13 | simpr1 1207 | . . 3 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → 𝐴 ∈ (𝔼‘𝑁)) | |
| 14 | simpr3 1209 | . . 3 ⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐵 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) → 𝐶 ∈ (𝔼‘𝑁)) | |
| 15 | brsegle 36419 | . . 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 1397 | . 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 259 | 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 208 ∧ wa 399 ∧ w3a 1097 = wceq 1559 ∈ wcel 2141 ∃wrex 3085 〈cop 4585 class class class wbr 5097 ‘cfv 6516 ℕcn 12204 𝔼cee 29045 Btwn cbtwn 29046 Cgrccgr 29047 Seg≤ csegle 36417 |
| 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 5224 ax-sep 5243 ax-nul 5253 ax-pow 5319 ax-pr 5387 ax-un 7713 ax-inf2 9590 ax-cnex 11123 ax-resscn 11124 ax-1cn 11125 ax-icn 11126 ax-addcl 11127 ax-addrcl 11128 ax-mulcl 11129 ax-mulrcl 11130 ax-mulcom 11131 ax-addass 11132 ax-mulass 11133 ax-distr 11134 ax-i2m1 11135 ax-1ne0 11136 ax-1rid 11137 ax-rnegex 11138 ax-rrecex 11139 ax-cnre 11140 ax-pre-lttri 11141 ax-pre-lttrn 11142 ax-pre-ltadd 11143 ax-pre-mulgt0 11144 ax-pre-sup 11145 |
| 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-rmo 3366 df-reu 3367 df-rab 3414 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 4284 df-if 4478 df-pw 4554 df-sn 4580 df-pr 4582 df-op 4586 df-uni 4863 df-int 4903 df-iun 4948 df-br 5098 df-opab 5160 df-mpt 5179 df-tr 5205 df-id 5538 df-eprel 5543 df-po 5551 df-so 5552 df-fr 5596 df-se 5597 df-we 5598 df-xp 5649 df-rel 5650 df-cnv 5651 df-co 5652 df-dm 5653 df-rn 5654 df-res 5655 df-ima 5656 df-pred 6283 df-ord 6344 df-on 6345 df-lim 6346 df-suc 6347 df-iota 6472 df-fun 6518 df-fn 6519 df-f 6520 df-f1 6521 df-fo 6522 df-f1o 6523 df-fv 6524 df-isom 6525 df-riota 7348 df-ov 7394 df-oprab 7395 df-mpo 7396 df-om 7842 df-1st 7965 df-2nd 7966 df-frecs 8256 df-wrecs 8287 df-recs 8336 df-rdg 8375 df-1o 8431 df-er 8672 df-map 8804 df-en 8922 df-dom 8923 df-sdom 8924 df-fin 8925 df-sup 9382 df-oi 9452 df-card 9891 df-pnf 11212 df-mnf 11213 df-xr 11214 df-ltxr 11215 df-le 11216 df-sub 11410 df-neg 11411 df-div 11839 df-nn 12205 df-2 12274 df-3 12275 df-n0 12476 df-z 12563 df-uz 12834 df-rp 12988 df-ico 13349 df-icc 13350 df-fz 13507 df-fzo 13654 df-seq 14009 df-exp 14069 df-hash 14338 df-cj 15117 df-re 15118 df-im 15119 df-sqrt 15253 df-abs 15254 df-clim 15506 df-sum 15705 df-ee 29048 df-btwn 29049 df-cgr 29050 df-segle 36418 |
| This theorem is referenced by: (None) |
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