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| Mirrors > Home > MPE Home > Th. List > arch | Structured version Visualization version GIF version | ||
| Description: Archimedean property of real numbers. For any real number, there is an integer greater than it. Theorem I.29 of [Apostol] p. 26. (Contributed by NM, 21-Jan-1997.) |
| Ref | Expression |
|---|---|
| arch | ⊢ (𝐴 ∈ ℝ → ∃𝑛 ∈ ℕ 𝐴 < 𝑛) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | breq1 5103 | . . 3 ⊢ (𝑦 = 𝐴 → (𝑦 < 𝑛 ↔ 𝐴 < 𝑛)) | |
| 2 | 1 | rexbidv 3186 | . 2 ⊢ (𝑦 = 𝐴 → (∃𝑛 ∈ ℕ 𝑦 < 𝑛 ↔ ∃𝑛 ∈ ℕ 𝐴 < 𝑛)) |
| 3 | nnunb 12477 | . . . 4 ⊢ ¬ ∃𝑦 ∈ ℝ ∀𝑛 ∈ ℕ (𝑛 < 𝑦 ∨ 𝑛 = 𝑦) | |
| 4 | ralnex 3088 | . . . 4 ⊢ (∀𝑦 ∈ ℝ ¬ ∀𝑛 ∈ ℕ (𝑛 < 𝑦 ∨ 𝑛 = 𝑦) ↔ ¬ ∃𝑦 ∈ ℝ ∀𝑛 ∈ ℕ (𝑛 < 𝑦 ∨ 𝑛 = 𝑦)) | |
| 5 | 3, 4 | mpbir 233 | . . 3 ⊢ ∀𝑦 ∈ ℝ ¬ ∀𝑛 ∈ ℕ (𝑛 < 𝑦 ∨ 𝑛 = 𝑦) |
| 6 | rexnal 3114 | . . . . 5 ⊢ (∃𝑛 ∈ ℕ ¬ (𝑛 < 𝑦 ∨ 𝑛 = 𝑦) ↔ ¬ ∀𝑛 ∈ ℕ (𝑛 < 𝑦 ∨ 𝑛 = 𝑦)) | |
| 7 | nnre 12217 | . . . . . . . . 9 ⊢ (𝑛 ∈ ℕ → 𝑛 ∈ ℝ) | |
| 8 | axlttri 11254 | . . . . . . . . 9 ⊢ ((𝑦 ∈ ℝ ∧ 𝑛 ∈ ℝ) → (𝑦 < 𝑛 ↔ ¬ (𝑦 = 𝑛 ∨ 𝑛 < 𝑦))) | |
| 9 | 7, 8 | sylan2 602 | . . . . . . . 8 ⊢ ((𝑦 ∈ ℝ ∧ 𝑛 ∈ ℕ) → (𝑦 < 𝑛 ↔ ¬ (𝑦 = 𝑛 ∨ 𝑛 < 𝑦))) |
| 10 | equcom 2038 | . . . . . . . . . . 11 ⊢ (𝑦 = 𝑛 ↔ 𝑛 = 𝑦) | |
| 11 | 10 | orbi1i 924 | . . . . . . . . . 10 ⊢ ((𝑦 = 𝑛 ∨ 𝑛 < 𝑦) ↔ (𝑛 = 𝑦 ∨ 𝑛 < 𝑦)) |
| 12 | orcom 881 | . . . . . . . . . 10 ⊢ ((𝑛 = 𝑦 ∨ 𝑛 < 𝑦) ↔ (𝑛 < 𝑦 ∨ 𝑛 = 𝑦)) | |
| 13 | 11, 12 | bitri 277 | . . . . . . . . 9 ⊢ ((𝑦 = 𝑛 ∨ 𝑛 < 𝑦) ↔ (𝑛 < 𝑦 ∨ 𝑛 = 𝑦)) |
| 14 | 13 | notbii 322 | . . . . . . . 8 ⊢ (¬ (𝑦 = 𝑛 ∨ 𝑛 < 𝑦) ↔ ¬ (𝑛 < 𝑦 ∨ 𝑛 = 𝑦)) |
| 15 | 9, 14 | bitrdi 289 | . . . . . . 7 ⊢ ((𝑦 ∈ ℝ ∧ 𝑛 ∈ ℕ) → (𝑦 < 𝑛 ↔ ¬ (𝑛 < 𝑦 ∨ 𝑛 = 𝑦))) |
| 16 | 15 | biimprd 250 | . . . . . 6 ⊢ ((𝑦 ∈ ℝ ∧ 𝑛 ∈ ℕ) → (¬ (𝑛 < 𝑦 ∨ 𝑛 = 𝑦) → 𝑦 < 𝑛)) |
| 17 | 16 | reximdva 3175 | . . . . 5 ⊢ (𝑦 ∈ ℝ → (∃𝑛 ∈ ℕ ¬ (𝑛 < 𝑦 ∨ 𝑛 = 𝑦) → ∃𝑛 ∈ ℕ 𝑦 < 𝑛)) |
| 18 | 6, 17 | biimtrrid 245 | . . . 4 ⊢ (𝑦 ∈ ℝ → (¬ ∀𝑛 ∈ ℕ (𝑛 < 𝑦 ∨ 𝑛 = 𝑦) → ∃𝑛 ∈ ℕ 𝑦 < 𝑛)) |
| 19 | 18 | ralimia 3096 | . . 3 ⊢ (∀𝑦 ∈ ℝ ¬ ∀𝑛 ∈ ℕ (𝑛 < 𝑦 ∨ 𝑛 = 𝑦) → ∀𝑦 ∈ ℝ ∃𝑛 ∈ ℕ 𝑦 < 𝑛) |
| 20 | 5, 19 | ax-mp 5 | . 2 ⊢ ∀𝑦 ∈ ℝ ∃𝑛 ∈ ℕ 𝑦 < 𝑛 |
| 21 | 2, 20 | vtoclri 3549 | 1 ⊢ (𝐴 ∈ ℝ → ∃𝑛 ∈ ℕ 𝐴 < 𝑛) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 ↔ wb 208 ∧ wa 399 ∨ wo 858 = wceq 1560 ∈ wcel 2142 ∀wral 3076 ∃wrex 3086 class class class wbr 5100 ℝcr 11072 < clt 11216 ℕcn 12210 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1815 ax-4 1829 ax-5 1930 ax-6 1987 ax-7 2028 ax-8 2144 ax-9 2152 ax-10 2175 ax-11 2191 ax-12 2212 ax-ext 2734 ax-sep 5246 ax-nul 5256 ax-pow 5322 ax-pr 5390 ax-un 7718 ax-resscn 11130 ax-1cn 11131 ax-icn 11132 ax-addcl 11133 ax-addrcl 11134 ax-mulcl 11135 ax-mulrcl 11136 ax-mulcom 11137 ax-addass 11138 ax-mulass 11139 ax-distr 11140 ax-i2m1 11141 ax-1ne0 11142 ax-1rid 11143 ax-rnegex 11144 ax-rrecex 11145 ax-cnre 11146 ax-pre-lttri 11147 ax-pre-lttrn 11148 ax-pre-ltadd 11149 ax-pre-mulgt0 11150 ax-pre-sup 11151 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3or 1099 df-3an 1100 df-tru 1563 df-fal 1573 df-ex 1800 df-nf 1804 df-sb 2091 df-mo 2566 df-eu 2596 df-clab 2741 df-cleq 2754 df-clel 2837 df-nfc 2911 df-ne 2958 df-nel 3062 df-ral 3077 df-rex 3087 df-reu 3368 df-rab 3415 df-v 3456 df-sbc 3745 df-csb 3853 df-dif 3907 df-un 3909 df-in 3911 df-ss 3921 df-pss 3924 df-nul 4286 df-if 4481 df-pw 4557 df-sn 4583 df-pr 4585 df-op 4589 df-uni 4866 df-iun 4951 df-br 5101 df-opab 5163 df-mpt 5182 df-tr 5208 df-id 5542 df-eprel 5547 df-po 5555 df-so 5556 df-fr 5600 df-we 5602 df-xp 5653 df-rel 5654 df-cnv 5655 df-co 5656 df-dm 5657 df-rn 5658 df-res 5659 df-ima 5660 df-pred 6288 df-ord 6349 df-on 6350 df-lim 6351 df-suc 6352 df-iota 6477 df-fun 6523 df-fn 6524 df-f 6525 df-f1 6526 df-fo 6527 df-f1o 6528 df-fv 6529 df-riota 7353 df-ov 7399 df-oprab 7400 df-mpo 7401 df-om 7847 df-2nd 7971 df-frecs 8262 df-wrecs 8293 df-recs 8342 df-rdg 8381 df-er 8678 df-en 8928 df-dom 8929 df-sdom 8930 df-pnf 11218 df-mnf 11219 df-xr 11220 df-ltxr 11221 df-le 11222 df-sub 11416 df-neg 11417 df-nn 12211 |
| This theorem is referenced by: nnrecl 12479 bndndx 12480 btwnz 12676 uzwo3 12944 zmin 12945 rpnnen1lem5 12982 harmonic 15889 alzdvds 16354 ovolicc2lem4 25582 volsup2 25667 ismbf3d 25716 mbfi1fseqlem6 25782 itg2seq 25804 itg2cnlem1 25823 ply1divex 26197 plydivex 26361 lgamucov 27102 lgamcvg2 27119 ubthlem1 31073 lnconi 32236 rearchi 33532 esumcst 34360 hbtlem5 43705 prmunb2 44887 rfcnnnub 45616 archd 45740 stoweidlem14 46588 stoweidlem60 46634 sge0rpcpnf 46995 fsupdm 47416 |
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