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Mirrors > Home > MPE Home > Th. List > elii2 | Structured version Visualization version GIF version |
Description: Divide the unit interval into two pieces. (Contributed by Mario Carneiro, 7-Jun-2014.) |
Ref | Expression |
---|---|
elii2 | ⊢ ((𝑋 ∈ (0[,]1) ∧ ¬ 𝑋 ≤ (1 / 2)) → 𝑋 ∈ ((1 / 2)[,]1)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elicc01 13503 | . . . 4 ⊢ (𝑋 ∈ (0[,]1) ↔ (𝑋 ∈ ℝ ∧ 0 ≤ 𝑋 ∧ 𝑋 ≤ 1)) | |
2 | 1 | simp1bi 1144 | . . 3 ⊢ (𝑋 ∈ (0[,]1) → 𝑋 ∈ ℝ) |
3 | 2 | adantr 480 | . 2 ⊢ ((𝑋 ∈ (0[,]1) ∧ ¬ 𝑋 ≤ (1 / 2)) → 𝑋 ∈ ℝ) |
4 | halfre 12478 | . . . 4 ⊢ (1 / 2) ∈ ℝ | |
5 | letric 11359 | . . . 4 ⊢ ((𝑋 ∈ ℝ ∧ (1 / 2) ∈ ℝ) → (𝑋 ≤ (1 / 2) ∨ (1 / 2) ≤ 𝑋)) | |
6 | 2, 4, 5 | sylancl 586 | . . 3 ⊢ (𝑋 ∈ (0[,]1) → (𝑋 ≤ (1 / 2) ∨ (1 / 2) ≤ 𝑋)) |
7 | 6 | orcanai 1004 | . 2 ⊢ ((𝑋 ∈ (0[,]1) ∧ ¬ 𝑋 ≤ (1 / 2)) → (1 / 2) ≤ 𝑋) |
8 | 1 | simp3bi 1146 | . . 3 ⊢ (𝑋 ∈ (0[,]1) → 𝑋 ≤ 1) |
9 | 8 | adantr 480 | . 2 ⊢ ((𝑋 ∈ (0[,]1) ∧ ¬ 𝑋 ≤ (1 / 2)) → 𝑋 ≤ 1) |
10 | 1re 11259 | . . 3 ⊢ 1 ∈ ℝ | |
11 | 4, 10 | elicc2i 13450 | . 2 ⊢ (𝑋 ∈ ((1 / 2)[,]1) ↔ (𝑋 ∈ ℝ ∧ (1 / 2) ≤ 𝑋 ∧ 𝑋 ≤ 1)) |
12 | 3, 7, 9, 11 | syl3anbrc 1342 | 1 ⊢ ((𝑋 ∈ (0[,]1) ∧ ¬ 𝑋 ≤ (1 / 2)) → 𝑋 ∈ ((1 / 2)[,]1)) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ∧ wa 395 ∨ wo 847 ∈ wcel 2106 class class class wbr 5148 (class class class)co 7431 ℝcr 11152 0cc0 11153 1c1 11154 ≤ cle 11294 / cdiv 11918 2c2 12319 [,]cicc 13387 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1908 ax-6 1965 ax-7 2005 ax-8 2108 ax-9 2116 ax-10 2139 ax-11 2155 ax-12 2175 ax-ext 2706 ax-sep 5302 ax-nul 5312 ax-pow 5371 ax-pr 5438 ax-un 7754 ax-cnex 11209 ax-resscn 11210 ax-1cn 11211 ax-icn 11212 ax-addcl 11213 ax-addrcl 11214 ax-mulcl 11215 ax-mulrcl 11216 ax-mulcom 11217 ax-addass 11218 ax-mulass 11219 ax-distr 11220 ax-i2m1 11221 ax-1ne0 11222 ax-1rid 11223 ax-rnegex 11224 ax-rrecex 11225 ax-cnre 11226 ax-pre-lttri 11227 ax-pre-lttrn 11228 ax-pre-ltadd 11229 ax-pre-mulgt0 11230 |
This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1540 df-fal 1550 df-ex 1777 df-nf 1781 df-sb 2063 df-mo 2538 df-eu 2567 df-clab 2713 df-cleq 2727 df-clel 2814 df-nfc 2890 df-ne 2939 df-nel 3045 df-ral 3060 df-rex 3069 df-rmo 3378 df-reu 3379 df-rab 3434 df-v 3480 df-sbc 3792 df-csb 3909 df-dif 3966 df-un 3968 df-in 3970 df-ss 3980 df-nul 4340 df-if 4532 df-pw 4607 df-sn 4632 df-pr 4634 df-op 4638 df-uni 4913 df-br 5149 df-opab 5211 df-mpt 5232 df-id 5583 df-po 5597 df-so 5598 df-xp 5695 df-rel 5696 df-cnv 5697 df-co 5698 df-dm 5699 df-rn 5700 df-res 5701 df-ima 5702 df-iota 6516 df-fun 6565 df-fn 6566 df-f 6567 df-f1 6568 df-fo 6569 df-f1o 6570 df-fv 6571 df-riota 7388 df-ov 7434 df-oprab 7435 df-mpo 7436 df-er 8744 df-en 8985 df-dom 8986 df-sdom 8987 df-pnf 11295 df-mnf 11296 df-xr 11297 df-ltxr 11298 df-le 11299 df-sub 11492 df-neg 11493 df-div 11919 df-2 12327 df-icc 13391 |
This theorem is referenced by: phtpycc 25037 copco 25065 pcohtpylem 25066 pcopt 25069 pcopt2 25070 pcoass 25071 pcorevlem 25073 |
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