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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 15324 | . . 3 ⊢ (√‘1) = 1 | |
| 2 | 1lt2 12414 | . . . 4 ⊢ 1 < 2 | |
| 3 | 1re 11209 | . . . . 5 ⊢ 1 ∈ ℝ | |
| 4 | 0le1 11738 | . . . . 5 ⊢ 0 ≤ 1 | |
| 5 | 2re 12316 | . . . . 5 ⊢ 2 ∈ ℝ | |
| 6 | 0le2 12344 | . . . . 5 ⊢ 0 ≤ 2 | |
| 7 | sqrtlt 15314 | . . . . 5 ⊢ (((1 ∈ ℝ ∧ 0 ≤ 1) ∧ (2 ∈ ℝ ∧ 0 ≤ 2)) → (1 < 2 ↔ (√‘1) < (√‘2))) | |
| 8 | 3, 4, 5, 6, 7 | mp4an 705 | . . . 4 ⊢ (1 < 2 ↔ (√‘1) < (√‘2)) |
| 9 | 2, 8 | mpbi 233 | . . 3 ⊢ (√‘1) < (√‘2) |
| 10 | 1, 9 | eqbrtrri 5135 | . 2 ⊢ 1 < (√‘2) |
| 11 | 2lt4 12419 | . . . 4 ⊢ 2 < 4 | |
| 12 | 4re 12326 | . . . . 5 ⊢ 4 ∈ ℝ | |
| 13 | 0re 11211 | . . . . . 6 ⊢ 0 ∈ ℝ | |
| 14 | 4pos 12352 | . . . . . 6 ⊢ 0 < 4 | |
| 15 | 13, 12, 14 | ltleii 11334 | . . . . 5 ⊢ 0 ≤ 4 |
| 16 | sqrtlt 15314 | . . . . 5 ⊢ (((2 ∈ ℝ ∧ 0 ≤ 2) ∧ (4 ∈ ℝ ∧ 0 ≤ 4)) → (2 < 4 ↔ (√‘2) < (√‘4))) | |
| 17 | 5, 6, 12, 15, 16 | mp4an 705 | . . . 4 ⊢ (2 < 4 ↔ (√‘2) < (√‘4)) |
| 18 | 11, 17 | mpbi 233 | . . 3 ⊢ (√‘2) < (√‘4) |
| 19 | sqrt4 15325 | . . 3 ⊢ (√‘4) = 2 | |
| 20 | 18, 19 | breqtri 5137 | . 2 ⊢ (√‘2) < 2 |
| 21 | 10, 20 | pm3.2i 475 | 1 ⊢ (1 < (√‘2) ∧ (√‘2) < 2) |
| Colors of variables: wff setvar class |
| Syntax hints: ↔ wb 209 ∧ wa 400 ∈ wcel 2143 class class class wbr 5110 ‘cfv 6538 ℝcr 11100 0cc0 11101 1c1 11102 < clt 11244 ≤ cle 11245 2c2 12296 4c4 12298 √csqrt 15286 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1825 ax-4 1839 ax-5 1940 ax-6 1997 ax-7 2038 ax-8 2145 ax-9 2153 ax-10 2176 ax-11 2192 ax-12 2213 ax-ext 2735 ax-sep 5258 ax-nul 5270 ax-pow 5338 ax-pr 5406 ax-un 7734 ax-cnex 11157 ax-resscn 11158 ax-1cn 11159 ax-icn 11160 ax-addcl 11161 ax-addrcl 11162 ax-mulcl 11163 ax-mulrcl 11164 ax-mulcom 11165 ax-addass 11166 ax-mulass 11167 ax-distr 11168 ax-i2m1 11169 ax-1ne0 11170 ax-1rid 11171 ax-rnegex 11172 ax-rrecex 11173 ax-cnre 11174 ax-pre-lttri 11175 ax-pre-lttrn 11176 ax-pre-ltadd 11177 ax-pre-mulgt0 11178 ax-pre-sup 11179 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1810 df-nf 1814 df-sb 2097 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2838 df-nfc 2912 df-ne 2959 df-nel 3065 df-ral 3080 df-rex 3090 df-rmo 3369 df-reu 3370 df-rab 3417 df-v 3457 df-sbc 3746 df-csb 3855 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-pss 3926 df-nul 4288 df-if 4489 df-pw 4565 df-sn 4591 df-pr 4593 df-op 4597 df-uni 4874 df-iun 4959 df-br 5111 df-opab 5175 df-mpt 5194 df-tr 5220 df-id 5558 df-eprel 5563 df-po 5571 df-so 5572 df-fr 5616 df-we 5618 df-xp 5669 df-rel 5670 df-cnv 5671 df-co 5672 df-dm 5673 df-rn 5674 df-res 5675 df-ima 5676 df-pred 6304 df-ord 6365 df-on 6366 df-lim 6367 df-suc 6368 df-iota 6494 df-fun 6540 df-fn 6541 df-f 6542 df-f1 6543 df-fo 6544 df-f1o 6545 df-fv 6546 df-riota 7369 df-ov 7415 df-oprab 7416 df-mpo 7417 df-om 7864 df-2nd 7988 df-frecs 8279 df-wrecs 8310 df-recs 8359 df-rdg 8398 df-er 8695 df-en 8945 df-dom 8946 df-sdom 8947 df-sup 9403 df-pnf 11246 df-mnf 11247 df-xr 11248 df-ltxr 11249 df-le 11250 df-sub 11444 df-neg 11445 df-div 11873 df-nn 12235 df-2 12304 df-3 12305 df-4 12306 df-n0 12506 df-z 12593 df-uz 12864 df-rp 13018 df-seq 14040 df-exp 14100 df-cj 15152 df-re 15153 df-im 15154 df-sqrt 15288 |
| This theorem is referenced by: (None) |
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