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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 15467 | . . 3 ⊢ (√‘1) = 1 | |
| 2 | 1lt2 12542 | . . . 4 ⊢ 1 < 2 | |
| 3 | 1re 11335 | . . . . 5 ⊢ 1 ∈ ℝ | |
| 4 | 0le1 11866 | . . . . 5 ⊢ 0 ≤ 1 | |
| 5 | 2re 12444 | . . . . 5 ⊢ 2 ∈ ℝ | |
| 6 | 0le2 12472 | . . . . 5 ⊢ 0 ≤ 2 | |
| 7 | sqrtlt 15457 | . . . . 5 ⊢ (((1 ∈ ℝ ∧ 0 ≤ 1) ∧ (2 ∈ ℝ ∧ 0 ≤ 2)) → (1 < 2 ↔ (√‘1) < (√‘2))) | |
| 8 | 3, 4, 5, 6, 7 | mp4an 706 | . . . 4 ⊢ (1 < 2 ↔ (√‘1) < (√‘2)) |
| 9 | 2, 8 | mpbi 233 | . . 3 ⊢ (√‘1) < (√‘2) |
| 10 | 1, 9 | eqbrtrri 5131 | . 2 ⊢ 1 < (√‘2) |
| 11 | 2lt4 12547 | . . . 4 ⊢ 2 < 4 | |
| 12 | 4re 12454 | . . . . 5 ⊢ 4 ∈ ℝ | |
| 13 | 0re 11337 | . . . . . 6 ⊢ 0 ∈ ℝ | |
| 14 | 4pos 12480 | . . . . . 6 ⊢ 0 < 4 | |
| 15 | 13, 12, 14 | ltleii 11460 | . . . . 5 ⊢ 0 ≤ 4 |
| 16 | sqrtlt 15457 | . . . . 5 ⊢ (((2 ∈ ℝ ∧ 0 ≤ 2) ∧ (4 ∈ ℝ ∧ 0 ≤ 4)) → (2 < 4 ↔ (√‘2) < (√‘4))) | |
| 17 | 5, 6, 12, 15, 16 | mp4an 706 | . . . 4 ⊢ (2 < 4 ↔ (√‘2) < (√‘4)) |
| 18 | 11, 17 | mpbi 233 | . . 3 ⊢ (√‘2) < (√‘4) |
| 19 | sqrt4 15468 | . . 3 ⊢ (√‘4) = 2 | |
| 20 | 18, 19 | breqtri 5133 | . 2 ⊢ (√‘2) < 2 |
| 21 | 10, 20 | pm3.2i 476 | 1 ⊢ (1 < (√‘2) ∧ (√‘2) < 2) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ↔ wb 209 ∧ wa 401 ∈ wcel 2147 class class class wbr 5106 ‘cfv 6558 ℝcr 11226 0cc0 11227 1c1 11228 < clt 11370 ≤ cle 11371 2c2 12424 4c4 12426 √csqrt 15429 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-10 2180 ax-11 2197 ax-12 2216 ax-ext 2735 ax-sep 5252 ax-nul 5263 ax-pow 5331 ax-pr 5395 ax-un 7775 ax-cnex 11283 ax-resscn 11284 ax-1cn 11285 ax-icn 11286 ax-addcl 11287 ax-addrcl 11288 ax-mulcl 11289 ax-mulrcl 11290 ax-mulcom 11291 ax-addass 11292 ax-mulass 11293 ax-distr 11294 ax-i2m1 11295 ax-1ne0 11296 ax-1rid 11297 ax-rnegex 11298 ax-rrecex 11299 ax-cnre 11300 ax-pre-lttri 11301 ax-pre-lttrn 11302 ax-pre-ltadd 11303 ax-pre-mulgt0 11304 ax-pre-sup 11305 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2102 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2839 df-nfc 2913 df-ne 2960 df-nel 3066 df-ral 3081 df-rex 3091 df-rmo 3369 df-reu 3370 df-rab 3417 df-v 3456 df-sbc 3743 df-csb 3852 df-ss 3901 df-pss 4017 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-pw 4562 df-sn 4589 df-pr 4591 df-op 4839 df-uni 4871 df-iun 4956 df-br 5107 df-opab 5171 df-mpt 5190 df-tr 5216 df-id 5550 df-eprel 5555 df-po 5563 df-so 5564 df-fr 5608 df-we 5610 df-xp 5661 df-rel 5662 df-cnv 5663 df-co 5664 df-dm 5665 df-rn 5666 df-res 5667 df-ima 5668 df-pred 6322 df-ord 6383 df-on 6384 df-lim 6385 df-suc 6386 df-iota 6512 df-fun 6560 df-fn 6561 df-f 6562 df-f1 6563 df-fo 6564 df-f1o 6565 df-fv 6566 df-riota 7400 df-ov 7446 df-oprab 7447 df-mpo 7448 df-om 7902 df-2nd 8026 df-frecs 8327 df-wrecs 8358 df-recs 8407 df-rdg 8446 df-er 8745 df-en 9002 df-dom 9003 df-sdom 9004 df-sup 9461 df-pnf 11372 df-mnf 11373 df-xr 11374 df-ltxr 11375 df-le 11376 df-sub 11570 df-neg 11571 df-div 12001 df-nn 12363 df-2 12432 df-3 12433 df-4 12434 df-n0 12634 df-z 12721 df-uz 12993 df-rp 13148 df-seq 14172 df-exp 14232 df-cj 15295 df-re 15296 df-im 15297 df-sqrt 15431 |
| This theorem is used by: (None) |
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