| Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
| Mirrors > Home > MPE Home > Th. List > sqrt2gt1lt2 | Structured version Visualization version GIF version | ||
| Description: The square root of 2 is bounded by 1 and 2. (Contributed by Roy F. Longton, 8-Aug-2005.) (Revised by Mario Carneiro, 6-Sep-2013.) |
| Ref | Expression |
|---|---|
| sqrt2gt1lt2 | ⊢ (1 < (√‘2) ∧ (√‘2) < 2) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | sqrt1 15175 | . . 3 ⊢ (√‘1) = 1 | |
| 2 | 1lt2 12288 | . . . 4 ⊢ 1 < 2 | |
| 3 | 1re 11109 | . . . . 5 ⊢ 1 ∈ ℝ | |
| 4 | 0le1 11637 | . . . . 5 ⊢ 0 ≤ 1 | |
| 5 | 2re 12196 | . . . . 5 ⊢ 2 ∈ ℝ | |
| 6 | 0le2 12224 | . . . . 5 ⊢ 0 ≤ 2 | |
| 7 | sqrtlt 15165 | . . . . 5 ⊢ (((1 ∈ ℝ ∧ 0 ≤ 1) ∧ (2 ∈ ℝ ∧ 0 ≤ 2)) → (1 < 2 ↔ (√‘1) < (√‘2))) | |
| 8 | 3, 4, 5, 6, 7 | mp4an 693 | . . . 4 ⊢ (1 < 2 ↔ (√‘1) < (√‘2)) |
| 9 | 2, 8 | mpbi 230 | . . 3 ⊢ (√‘1) < (√‘2) |
| 10 | 1, 9 | eqbrtrri 5114 | . 2 ⊢ 1 < (√‘2) |
| 11 | 2lt4 12292 | . . . 4 ⊢ 2 < 4 | |
| 12 | 4re 12206 | . . . . 5 ⊢ 4 ∈ ℝ | |
| 13 | 0re 11111 | . . . . . 6 ⊢ 0 ∈ ℝ | |
| 14 | 4pos 12229 | . . . . . 6 ⊢ 0 < 4 | |
| 15 | 13, 12, 14 | ltleii 11233 | . . . . 5 ⊢ 0 ≤ 4 |
| 16 | sqrtlt 15165 | . . . . 5 ⊢ (((2 ∈ ℝ ∧ 0 ≤ 2) ∧ (4 ∈ ℝ ∧ 0 ≤ 4)) → (2 < 4 ↔ (√‘2) < (√‘4))) | |
| 17 | 5, 6, 12, 15, 16 | mp4an 693 | . . . 4 ⊢ (2 < 4 ↔ (√‘2) < (√‘4)) |
| 18 | 11, 17 | mpbi 230 | . . 3 ⊢ (√‘2) < (√‘4) |
| 19 | sqrt4 15176 | . . 3 ⊢ (√‘4) = 2 | |
| 20 | 18, 19 | breqtri 5116 | . 2 ⊢ (√‘2) < 2 |
| 21 | 10, 20 | pm3.2i 470 | 1 ⊢ (1 < (√‘2) ∧ (√‘2) < 2) |
| Colors of variables: wff setvar class |
| Syntax hints: ↔ wb 206 ∧ wa 395 ∈ wcel 2111 class class class wbr 5091 ‘cfv 6481 ℝcr 11002 0cc0 11003 1c1 11004 < clt 11143 ≤ cle 11144 2c2 12177 4c4 12179 √csqrt 15137 |
| 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 1968 ax-7 2009 ax-8 2113 ax-9 2121 ax-10 2144 ax-11 2160 ax-12 2180 ax-ext 2703 ax-sep 5234 ax-nul 5244 ax-pow 5303 ax-pr 5370 ax-un 7668 ax-cnex 11059 ax-resscn 11060 ax-1cn 11061 ax-icn 11062 ax-addcl 11063 ax-addrcl 11064 ax-mulcl 11065 ax-mulrcl 11066 ax-mulcom 11067 ax-addass 11068 ax-mulass 11069 ax-distr 11070 ax-i2m1 11071 ax-1ne0 11072 ax-1rid 11073 ax-rnegex 11074 ax-rrecex 11075 ax-cnre 11076 ax-pre-lttri 11077 ax-pre-lttrn 11078 ax-pre-ltadd 11079 ax-pre-mulgt0 11080 ax-pre-sup 11081 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2535 df-eu 2564 df-clab 2710 df-cleq 2723 df-clel 2806 df-nfc 2881 df-ne 2929 df-nel 3033 df-ral 3048 df-rex 3057 df-rmo 3346 df-reu 3347 df-rab 3396 df-v 3438 df-sbc 3742 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-pss 3922 df-nul 4284 df-if 4476 df-pw 4552 df-sn 4577 df-pr 4579 df-op 4583 df-uni 4860 df-iun 4943 df-br 5092 df-opab 5154 df-mpt 5173 df-tr 5199 df-id 5511 df-eprel 5516 df-po 5524 df-so 5525 df-fr 5569 df-we 5571 df-xp 5622 df-rel 5623 df-cnv 5624 df-co 5625 df-dm 5626 df-rn 5627 df-res 5628 df-ima 5629 df-pred 6248 df-ord 6309 df-on 6310 df-lim 6311 df-suc 6312 df-iota 6437 df-fun 6483 df-fn 6484 df-f 6485 df-f1 6486 df-fo 6487 df-f1o 6488 df-fv 6489 df-riota 7303 df-ov 7349 df-oprab 7350 df-mpo 7351 df-om 7797 df-2nd 7922 df-frecs 8211 df-wrecs 8242 df-recs 8291 df-rdg 8329 df-er 8622 df-en 8870 df-dom 8871 df-sdom 8872 df-sup 9326 df-pnf 11145 df-mnf 11146 df-xr 11147 df-ltxr 11148 df-le 11149 df-sub 11343 df-neg 11344 df-div 11772 df-nn 12123 df-2 12185 df-3 12186 df-4 12187 df-n0 12379 df-z 12466 df-uz 12730 df-rp 12888 df-seq 13906 df-exp 13966 df-cj 15003 df-re 15004 df-im 15005 df-sqrt 15139 |
| This theorem is referenced by: (None) |
| Copyright terms: Public domain | W3C validator |