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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 11146 | . . . . . . . 8 ⊢ 0 ∈ ℝ | |
| 2 | ltnle 11224 | . . . . . . . 8 ⊢ ((0 ∈ ℝ ∧ 𝐴 ∈ ℝ) → (0 < 𝐴 ↔ ¬ 𝐴 ≤ 0)) | |
| 3 | 1, 2 | mpan 691 | . . . . . . 7 ⊢ (𝐴 ∈ ℝ → (0 < 𝐴 ↔ ¬ 𝐴 ≤ 0)) |
| 4 | qbtwnre 13126 | . . . . . . . . . 10 ⊢ ((0 ∈ ℝ ∧ 𝐴 ∈ ℝ ∧ 0 < 𝐴) → ∃𝑥 ∈ ℚ (0 < 𝑥 ∧ 𝑥 < 𝐴)) | |
| 5 | 1, 4 | mp3an1 1451 | . . . . . . . . 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 12878 | . . . . . . . . . . 11 ⊢ (𝑥 ∈ ℚ → 𝑥 ∈ ℝ) | |
| 8 | ltnsym 11243 | . . . . . . . . . . . 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 594 | . . . . . . . . . 10 ⊢ ((𝐴 ∈ ℝ ∧ 𝑥 ∈ ℚ) → (𝑥 < 𝐴 → ¬ 𝐴 < 𝑥)) |
| 11 | 10 | anim2d 613 | . . . . . . . . 9 ⊢ ((𝐴 ∈ ℝ ∧ 𝑥 ∈ ℚ) → ((0 < 𝑥 ∧ 𝑥 < 𝐴) → (0 < 𝑥 ∧ ¬ 𝐴 < 𝑥))) |
| 12 | 11 | reximdva 3151 | . . . . . . . 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 260 | . . . . . 6 ⊢ (𝐴 ∈ ℝ → (¬ 𝐴 ≤ 0 → ∃𝑥 ∈ ℚ (0 < 𝑥 ∧ ¬ 𝐴 < 𝑥))) |
| 15 | rexanali 3092 | . . . . . 6 ⊢ (∃𝑥 ∈ ℚ (0 < 𝑥 ∧ ¬ 𝐴 < 𝑥) ↔ ¬ ∀𝑥 ∈ ℚ (0 < 𝑥 → 𝐴 < 𝑥)) | |
| 16 | 14, 15 | imbitrdi 251 | . . . . 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 1132 | . 2 ⊢ ((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴 ∧ ∀𝑥 ∈ ℚ (0 < 𝑥 → 𝐴 < 𝑥)) → 𝐴 ≤ 0) |
| 20 | letri3 11230 | . . . . 5 ⊢ ((𝐴 ∈ ℝ ∧ 0 ∈ ℝ) → (𝐴 = 0 ↔ (𝐴 ≤ 0 ∧ 0 ≤ 𝐴))) | |
| 21 | 1, 20 | mpan2 692 | . . . 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 1133 | . 2 ⊢ ((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴 ∧ ∀𝑥 ∈ ℚ (0 < 𝑥 → 𝐴 < 𝑥)) → (𝐴 = 0 ↔ 𝐴 ≤ 0)) |
| 24 | 19, 23 | mpbird 257 | 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 206 ∧ wa 395 ∧ w3a 1087 = wceq 1542 ∈ wcel 2114 ∀wral 3052 ∃wrex 3062 class class class wbr 5100 ℝcr 11037 0cc0 11038 < clt 11178 ≤ cle 11179 ℚcq 12873 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-sep 5243 ax-nul 5253 ax-pow 5312 ax-pr 5379 ax-un 7690 ax-cnex 11094 ax-resscn 11095 ax-1cn 11096 ax-icn 11097 ax-addcl 11098 ax-addrcl 11099 ax-mulcl 11100 ax-mulrcl 11101 ax-mulcom 11102 ax-addass 11103 ax-mulass 11104 ax-distr 11105 ax-i2m1 11106 ax-1ne0 11107 ax-1rid 11108 ax-rnegex 11109 ax-rrecex 11110 ax-cnre 11111 ax-pre-lttri 11112 ax-pre-lttrn 11113 ax-pre-ltadd 11114 ax-pre-mulgt0 11115 ax-pre-sup 11116 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-nel 3038 df-ral 3053 df-rex 3063 df-rmo 3352 df-reu 3353 df-rab 3402 df-v 3444 df-sbc 3743 df-csb 3852 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-pss 3923 df-nul 4288 df-if 4482 df-pw 4558 df-sn 4583 df-pr 4585 df-op 4589 df-uni 4866 df-iun 4950 df-br 5101 df-opab 5163 df-mpt 5182 df-tr 5208 df-id 5527 df-eprel 5532 df-po 5540 df-so 5541 df-fr 5585 df-we 5587 df-xp 5638 df-rel 5639 df-cnv 5640 df-co 5641 df-dm 5642 df-rn 5643 df-res 5644 df-ima 5645 df-pred 6267 df-ord 6328 df-on 6329 df-lim 6330 df-suc 6331 df-iota 6456 df-fun 6502 df-fn 6503 df-f 6504 df-f1 6505 df-fo 6506 df-f1o 6507 df-fv 6508 df-riota 7325 df-ov 7371 df-oprab 7372 df-mpo 7373 df-om 7819 df-1st 7943 df-2nd 7944 df-frecs 8233 df-wrecs 8264 df-recs 8313 df-rdg 8351 df-er 8645 df-en 8896 df-dom 8897 df-sdom 8898 df-sup 9357 df-inf 9358 df-pnf 11180 df-mnf 11181 df-xr 11182 df-ltxr 11183 df-le 11184 df-sub 11378 df-neg 11379 df-div 11807 df-nn 12158 df-n0 12414 df-z 12501 df-uz 12764 df-q 12874 |
| This theorem is referenced by: (None) |
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