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| 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 15295 | . . 3 ⊢ (√‘1) = 1 | |
| 2 | 1lt2 12416 | . . . 4 ⊢ 1 < 2 | |
| 3 | 1re 11240 | . . . . 5 ⊢ 1 ∈ ℝ | |
| 4 | 0le1 11765 | . . . . 5 ⊢ 0 ≤ 1 | |
| 5 | 2re 12319 | . . . . 5 ⊢ 2 ∈ ℝ | |
| 6 | 0le2 12347 | . . . . 5 ⊢ 0 ≤ 2 | |
| 7 | sqrtlt 15285 | . . . . 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 5147 | . 2 ⊢ 1 < (√‘2) |
| 11 | 2lt4 12420 | . . . 4 ⊢ 2 < 4 | |
| 12 | 4re 12329 | . . . . 5 ⊢ 4 ∈ ℝ | |
| 13 | 0re 11242 | . . . . . 6 ⊢ 0 ∈ ℝ | |
| 14 | 4pos 12352 | . . . . . 6 ⊢ 0 < 4 | |
| 15 | 13, 12, 14 | ltleii 11363 | . . . . 5 ⊢ 0 ≤ 4 |
| 16 | sqrtlt 15285 | . . . . 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 15296 | . . 3 ⊢ (√‘4) = 2 | |
| 20 | 18, 19 | breqtri 5149 | . 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 2109 class class class wbr 5124 ‘cfv 6536 ℝcr 11133 0cc0 11134 1c1 11135 < clt 11274 ≤ cle 11275 2c2 12300 4c4 12302 √csqrt 15257 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2708 ax-sep 5271 ax-nul 5281 ax-pow 5340 ax-pr 5407 ax-un 7734 ax-cnex 11190 ax-resscn 11191 ax-1cn 11192 ax-icn 11193 ax-addcl 11194 ax-addrcl 11195 ax-mulcl 11196 ax-mulrcl 11197 ax-mulcom 11198 ax-addass 11199 ax-mulass 11200 ax-distr 11201 ax-i2m1 11202 ax-1ne0 11203 ax-1rid 11204 ax-rnegex 11205 ax-rrecex 11206 ax-cnre 11207 ax-pre-lttri 11208 ax-pre-lttrn 11209 ax-pre-ltadd 11210 ax-pre-mulgt0 11211 ax-pre-sup 11212 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2540 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2810 df-nfc 2886 df-ne 2934 df-nel 3038 df-ral 3053 df-rex 3062 df-rmo 3364 df-reu 3365 df-rab 3421 df-v 3466 df-sbc 3771 df-csb 3880 df-dif 3934 df-un 3936 df-in 3938 df-ss 3948 df-pss 3951 df-nul 4314 df-if 4506 df-pw 4582 df-sn 4607 df-pr 4609 df-op 4613 df-uni 4889 df-iun 4974 df-br 5125 df-opab 5187 df-mpt 5207 df-tr 5235 df-id 5553 df-eprel 5558 df-po 5566 df-so 5567 df-fr 5611 df-we 5613 df-xp 5665 df-rel 5666 df-cnv 5667 df-co 5668 df-dm 5669 df-rn 5670 df-res 5671 df-ima 5672 df-pred 6295 df-ord 6360 df-on 6361 df-lim 6362 df-suc 6363 df-iota 6489 df-fun 6538 df-fn 6539 df-f 6540 df-f1 6541 df-fo 6542 df-f1o 6543 df-fv 6544 df-riota 7367 df-ov 7413 df-oprab 7414 df-mpo 7415 df-om 7867 df-2nd 7994 df-frecs 8285 df-wrecs 8316 df-recs 8390 df-rdg 8429 df-er 8724 df-en 8965 df-dom 8966 df-sdom 8967 df-sup 9459 df-pnf 11276 df-mnf 11277 df-xr 11278 df-ltxr 11279 df-le 11280 df-sub 11473 df-neg 11474 df-div 11900 df-nn 12246 df-2 12308 df-3 12309 df-4 12310 df-n0 12507 df-z 12594 df-uz 12858 df-rp 13014 df-seq 14025 df-exp 14085 df-cj 15123 df-re 15124 df-im 15125 df-sqrt 15259 |
| This theorem is referenced by: (None) |
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