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Mirrors > Home > MPE Home > Th. List > icc0 | Structured version Visualization version GIF version |
Description: An empty closed interval of extended reals. (Contributed by FL, 30-May-2014.) |
Ref | Expression |
---|---|
icc0 | ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → ((𝐴[,]𝐵) = ∅ ↔ 𝐵 < 𝐴)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | iccval 12780 | . . 3 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → (𝐴[,]𝐵) = {𝑥 ∈ ℝ* ∣ (𝐴 ≤ 𝑥 ∧ 𝑥 ≤ 𝐵)}) | |
2 | 1 | eqeq1d 2825 | . 2 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → ((𝐴[,]𝐵) = ∅ ↔ {𝑥 ∈ ℝ* ∣ (𝐴 ≤ 𝑥 ∧ 𝑥 ≤ 𝐵)} = ∅)) |
3 | df-ne 3019 | . . . . . 6 ⊢ ({𝑥 ∈ ℝ* ∣ (𝐴 ≤ 𝑥 ∧ 𝑥 ≤ 𝐵)} ≠ ∅ ↔ ¬ {𝑥 ∈ ℝ* ∣ (𝐴 ≤ 𝑥 ∧ 𝑥 ≤ 𝐵)} = ∅) | |
4 | rabn0 4341 | . . . . . 6 ⊢ ({𝑥 ∈ ℝ* ∣ (𝐴 ≤ 𝑥 ∧ 𝑥 ≤ 𝐵)} ≠ ∅ ↔ ∃𝑥 ∈ ℝ* (𝐴 ≤ 𝑥 ∧ 𝑥 ≤ 𝐵)) | |
5 | 3, 4 | bitr3i 279 | . . . . 5 ⊢ (¬ {𝑥 ∈ ℝ* ∣ (𝐴 ≤ 𝑥 ∧ 𝑥 ≤ 𝐵)} = ∅ ↔ ∃𝑥 ∈ ℝ* (𝐴 ≤ 𝑥 ∧ 𝑥 ≤ 𝐵)) |
6 | xrletr 12554 | . . . . . . . . 9 ⊢ ((𝐴 ∈ ℝ* ∧ 𝑥 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → ((𝐴 ≤ 𝑥 ∧ 𝑥 ≤ 𝐵) → 𝐴 ≤ 𝐵)) | |
7 | 6 | 3com23 1122 | . . . . . . . 8 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ* ∧ 𝑥 ∈ ℝ*) → ((𝐴 ≤ 𝑥 ∧ 𝑥 ≤ 𝐵) → 𝐴 ≤ 𝐵)) |
8 | 7 | 3expa 1114 | . . . . . . 7 ⊢ (((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) ∧ 𝑥 ∈ ℝ*) → ((𝐴 ≤ 𝑥 ∧ 𝑥 ≤ 𝐵) → 𝐴 ≤ 𝐵)) |
9 | 8 | rexlimdva 3286 | . . . . . 6 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → (∃𝑥 ∈ ℝ* (𝐴 ≤ 𝑥 ∧ 𝑥 ≤ 𝐵) → 𝐴 ≤ 𝐵)) |
10 | simp2 1133 | . . . . . . . 8 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ* ∧ 𝐴 ≤ 𝐵) → 𝐵 ∈ ℝ*) | |
11 | simp3 1134 | . . . . . . . 8 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ* ∧ 𝐴 ≤ 𝐵) → 𝐴 ≤ 𝐵) | |
12 | xrleid 12547 | . . . . . . . . 9 ⊢ (𝐵 ∈ ℝ* → 𝐵 ≤ 𝐵) | |
13 | 12 | 3ad2ant2 1130 | . . . . . . . 8 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ* ∧ 𝐴 ≤ 𝐵) → 𝐵 ≤ 𝐵) |
14 | breq2 5072 | . . . . . . . . . 10 ⊢ (𝑥 = 𝐵 → (𝐴 ≤ 𝑥 ↔ 𝐴 ≤ 𝐵)) | |
15 | breq1 5071 | . . . . . . . . . 10 ⊢ (𝑥 = 𝐵 → (𝑥 ≤ 𝐵 ↔ 𝐵 ≤ 𝐵)) | |
16 | 14, 15 | anbi12d 632 | . . . . . . . . 9 ⊢ (𝑥 = 𝐵 → ((𝐴 ≤ 𝑥 ∧ 𝑥 ≤ 𝐵) ↔ (𝐴 ≤ 𝐵 ∧ 𝐵 ≤ 𝐵))) |
17 | 16 | rspcev 3625 | . . . . . . . 8 ⊢ ((𝐵 ∈ ℝ* ∧ (𝐴 ≤ 𝐵 ∧ 𝐵 ≤ 𝐵)) → ∃𝑥 ∈ ℝ* (𝐴 ≤ 𝑥 ∧ 𝑥 ≤ 𝐵)) |
18 | 10, 11, 13, 17 | syl12anc 834 | . . . . . . 7 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ* ∧ 𝐴 ≤ 𝐵) → ∃𝑥 ∈ ℝ* (𝐴 ≤ 𝑥 ∧ 𝑥 ≤ 𝐵)) |
19 | 18 | 3expia 1117 | . . . . . 6 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → (𝐴 ≤ 𝐵 → ∃𝑥 ∈ ℝ* (𝐴 ≤ 𝑥 ∧ 𝑥 ≤ 𝐵))) |
20 | 9, 19 | impbid 214 | . . . . 5 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → (∃𝑥 ∈ ℝ* (𝐴 ≤ 𝑥 ∧ 𝑥 ≤ 𝐵) ↔ 𝐴 ≤ 𝐵)) |
21 | 5, 20 | syl5bb 285 | . . . 4 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → (¬ {𝑥 ∈ ℝ* ∣ (𝐴 ≤ 𝑥 ∧ 𝑥 ≤ 𝐵)} = ∅ ↔ 𝐴 ≤ 𝐵)) |
22 | xrlenlt 10708 | . . . 4 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → (𝐴 ≤ 𝐵 ↔ ¬ 𝐵 < 𝐴)) | |
23 | 21, 22 | bitrd 281 | . . 3 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → (¬ {𝑥 ∈ ℝ* ∣ (𝐴 ≤ 𝑥 ∧ 𝑥 ≤ 𝐵)} = ∅ ↔ ¬ 𝐵 < 𝐴)) |
24 | 23 | con4bid 319 | . 2 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → ({𝑥 ∈ ℝ* ∣ (𝐴 ≤ 𝑥 ∧ 𝑥 ≤ 𝐵)} = ∅ ↔ 𝐵 < 𝐴)) |
25 | 2, 24 | bitrd 281 | 1 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → ((𝐴[,]𝐵) = ∅ ↔ 𝐵 < 𝐴)) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ↔ wb 208 ∧ wa 398 ∧ w3a 1083 = wceq 1537 ∈ wcel 2114 ≠ wne 3018 ∃wrex 3141 {crab 3144 ∅c0 4293 class class class wbr 5068 (class class class)co 7158 ℝ*cxr 10676 < clt 10677 ≤ cle 10678 [,]cicc 12744 |
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 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2795 ax-sep 5205 ax-nul 5212 ax-pow 5268 ax-pr 5332 ax-un 7463 ax-cnex 10595 ax-resscn 10596 ax-pre-lttri 10613 ax-pre-lttrn 10614 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2802 df-cleq 2816 df-clel 2895 df-nfc 2965 df-ne 3019 df-nel 3126 df-ral 3145 df-rex 3146 df-rab 3149 df-v 3498 df-sbc 3775 df-csb 3886 df-dif 3941 df-un 3943 df-in 3945 df-ss 3954 df-nul 4294 df-if 4470 df-pw 4543 df-sn 4570 df-pr 4572 df-op 4576 df-uni 4841 df-br 5069 df-opab 5131 df-mpt 5149 df-id 5462 df-po 5476 df-so 5477 df-xp 5563 df-rel 5564 df-cnv 5565 df-co 5566 df-dm 5567 df-rn 5568 df-res 5569 df-ima 5570 df-iota 6316 df-fun 6359 df-fn 6360 df-f 6361 df-f1 6362 df-fo 6363 df-f1o 6364 df-fv 6365 df-ov 7161 df-oprab 7162 df-mpo 7163 df-er 8291 df-en 8512 df-dom 8513 df-sdom 8514 df-pnf 10679 df-mnf 10680 df-xr 10681 df-ltxr 10682 df-le 10683 df-icc 12748 |
This theorem is referenced by: iccntr 23431 icccmp 23435 cniccbdd 24064 iccvolcl 24170 itgioo 24418 c1lip1 24596 pserulm 25012 iccdifprioo 41799 cncfiooicc 42184 ibliooicc 42263 voliccico 42291 vonicc 42974 |
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