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Mirrors > Home > MPE Home > Th. List > qsqueeze | Structured version Visualization version GIF version |
Description: If a nonnegative real is less than any positive rational, it is zero. (Contributed by NM, 6-Feb-2007.) |
Ref | Expression |
---|---|
qsqueeze | ⊢ ((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴 ∧ ∀𝑥 ∈ ℚ (0 < 𝑥 → 𝐴 < 𝑥)) → 𝐴 = 0) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 0re 10908 | . . . . . . . 8 ⊢ 0 ∈ ℝ | |
2 | ltnle 10985 | . . . . . . . 8 ⊢ ((0 ∈ ℝ ∧ 𝐴 ∈ ℝ) → (0 < 𝐴 ↔ ¬ 𝐴 ≤ 0)) | |
3 | 1, 2 | mpan 686 | . . . . . . 7 ⊢ (𝐴 ∈ ℝ → (0 < 𝐴 ↔ ¬ 𝐴 ≤ 0)) |
4 | qbtwnre 12862 | . . . . . . . . . 10 ⊢ ((0 ∈ ℝ ∧ 𝐴 ∈ ℝ ∧ 0 < 𝐴) → ∃𝑥 ∈ ℚ (0 < 𝑥 ∧ 𝑥 < 𝐴)) | |
5 | 1, 4 | mp3an1 1446 | . . . . . . . . 9 ⊢ ((𝐴 ∈ ℝ ∧ 0 < 𝐴) → ∃𝑥 ∈ ℚ (0 < 𝑥 ∧ 𝑥 < 𝐴)) |
6 | 5 | ex 412 | . . . . . . . 8 ⊢ (𝐴 ∈ ℝ → (0 < 𝐴 → ∃𝑥 ∈ ℚ (0 < 𝑥 ∧ 𝑥 < 𝐴))) |
7 | qre 12622 | . . . . . . . . . . 11 ⊢ (𝑥 ∈ ℚ → 𝑥 ∈ ℝ) | |
8 | ltnsym 11003 | . . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℝ ∧ 𝑥 ∈ ℝ) → (𝐴 < 𝑥 → ¬ 𝑥 < 𝐴)) | |
9 | 8 | con2d 134 | . . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℝ ∧ 𝑥 ∈ ℝ) → (𝑥 < 𝐴 → ¬ 𝐴 < 𝑥)) |
10 | 7, 9 | sylan2 592 | . . . . . . . . . 10 ⊢ ((𝐴 ∈ ℝ ∧ 𝑥 ∈ ℚ) → (𝑥 < 𝐴 → ¬ 𝐴 < 𝑥)) |
11 | 10 | anim2d 611 | . . . . . . . . 9 ⊢ ((𝐴 ∈ ℝ ∧ 𝑥 ∈ ℚ) → ((0 < 𝑥 ∧ 𝑥 < 𝐴) → (0 < 𝑥 ∧ ¬ 𝐴 < 𝑥))) |
12 | 11 | reximdva 3202 | . . . . . . . 8 ⊢ (𝐴 ∈ ℝ → (∃𝑥 ∈ ℚ (0 < 𝑥 ∧ 𝑥 < 𝐴) → ∃𝑥 ∈ ℚ (0 < 𝑥 ∧ ¬ 𝐴 < 𝑥))) |
13 | 6, 12 | syld 47 | . . . . . . 7 ⊢ (𝐴 ∈ ℝ → (0 < 𝐴 → ∃𝑥 ∈ ℚ (0 < 𝑥 ∧ ¬ 𝐴 < 𝑥))) |
14 | 3, 13 | sylbird 259 | . . . . . 6 ⊢ (𝐴 ∈ ℝ → (¬ 𝐴 ≤ 0 → ∃𝑥 ∈ ℚ (0 < 𝑥 ∧ ¬ 𝐴 < 𝑥))) |
15 | rexanali 3191 | . . . . . 6 ⊢ (∃𝑥 ∈ ℚ (0 < 𝑥 ∧ ¬ 𝐴 < 𝑥) ↔ ¬ ∀𝑥 ∈ ℚ (0 < 𝑥 → 𝐴 < 𝑥)) | |
16 | 14, 15 | syl6ib 250 | . . . . 5 ⊢ (𝐴 ∈ ℝ → (¬ 𝐴 ≤ 0 → ¬ ∀𝑥 ∈ ℚ (0 < 𝑥 → 𝐴 < 𝑥))) |
17 | 16 | con4d 115 | . . . 4 ⊢ (𝐴 ∈ ℝ → (∀𝑥 ∈ ℚ (0 < 𝑥 → 𝐴 < 𝑥) → 𝐴 ≤ 0)) |
18 | 17 | imp 406 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ ∀𝑥 ∈ ℚ (0 < 𝑥 → 𝐴 < 𝑥)) → 𝐴 ≤ 0) |
19 | 18 | 3adant2 1129 | . 2 ⊢ ((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴 ∧ ∀𝑥 ∈ ℚ (0 < 𝑥 → 𝐴 < 𝑥)) → 𝐴 ≤ 0) |
20 | letri3 10991 | . . . . 5 ⊢ ((𝐴 ∈ ℝ ∧ 0 ∈ ℝ) → (𝐴 = 0 ↔ (𝐴 ≤ 0 ∧ 0 ≤ 𝐴))) | |
21 | 1, 20 | mpan2 687 | . . . 4 ⊢ (𝐴 ∈ ℝ → (𝐴 = 0 ↔ (𝐴 ≤ 0 ∧ 0 ≤ 𝐴))) |
22 | 21 | rbaibd 540 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) → (𝐴 = 0 ↔ 𝐴 ≤ 0)) |
23 | 22 | 3adant3 1130 | . 2 ⊢ ((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴 ∧ ∀𝑥 ∈ ℚ (0 < 𝑥 → 𝐴 < 𝑥)) → (𝐴 = 0 ↔ 𝐴 ≤ 0)) |
24 | 19, 23 | mpbird 256 | 1 ⊢ ((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴 ∧ ∀𝑥 ∈ ℚ (0 < 𝑥 → 𝐴 < 𝑥)) → 𝐴 = 0) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ↔ wb 205 ∧ wa 395 ∧ w3a 1085 = wceq 1539 ∈ wcel 2108 ∀wral 3063 ∃wrex 3064 class class class wbr 5070 ℝcr 10801 0cc0 10802 < clt 10940 ≤ cle 10941 ℚcq 12617 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1799 ax-4 1813 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2110 ax-9 2118 ax-10 2139 ax-11 2156 ax-12 2173 ax-ext 2709 ax-sep 5218 ax-nul 5225 ax-pow 5283 ax-pr 5347 ax-un 7566 ax-cnex 10858 ax-resscn 10859 ax-1cn 10860 ax-icn 10861 ax-addcl 10862 ax-addrcl 10863 ax-mulcl 10864 ax-mulrcl 10865 ax-mulcom 10866 ax-addass 10867 ax-mulass 10868 ax-distr 10869 ax-i2m1 10870 ax-1ne0 10871 ax-1rid 10872 ax-rnegex 10873 ax-rrecex 10874 ax-cnre 10875 ax-pre-lttri 10876 ax-pre-lttrn 10877 ax-pre-ltadd 10878 ax-pre-mulgt0 10879 ax-pre-sup 10880 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1784 df-nf 1788 df-sb 2069 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2817 df-nfc 2888 df-ne 2943 df-nel 3049 df-ral 3068 df-rex 3069 df-reu 3070 df-rmo 3071 df-rab 3072 df-v 3424 df-sbc 3712 df-csb 3829 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-pss 3902 df-nul 4254 df-if 4457 df-pw 4532 df-sn 4559 df-pr 4561 df-tp 4563 df-op 4565 df-uni 4837 df-iun 4923 df-br 5071 df-opab 5133 df-mpt 5154 df-tr 5188 df-id 5480 df-eprel 5486 df-po 5494 df-so 5495 df-fr 5535 df-we 5537 df-xp 5586 df-rel 5587 df-cnv 5588 df-co 5589 df-dm 5590 df-rn 5591 df-res 5592 df-ima 5593 df-pred 6191 df-ord 6254 df-on 6255 df-lim 6256 df-suc 6257 df-iota 6376 df-fun 6420 df-fn 6421 df-f 6422 df-f1 6423 df-fo 6424 df-f1o 6425 df-fv 6426 df-riota 7212 df-ov 7258 df-oprab 7259 df-mpo 7260 df-om 7688 df-1st 7804 df-2nd 7805 df-frecs 8068 df-wrecs 8099 df-recs 8173 df-rdg 8212 df-er 8456 df-en 8692 df-dom 8693 df-sdom 8694 df-sup 9131 df-inf 9132 df-pnf 10942 df-mnf 10943 df-xr 10944 df-ltxr 10945 df-le 10946 df-sub 11137 df-neg 11138 df-div 11563 df-nn 11904 df-n0 12164 df-z 12250 df-uz 12512 df-q 12618 |
This theorem is referenced by: (None) |
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