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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 15418 | . . 3 ⊢ (√‘1) = 1 | |
| 2 | 1lt2 12496 | . . . 4 ⊢ 1 < 2 | |
| 3 | 1re 11289 | . . . . 5 ⊢ 1 ∈ ℝ | |
| 4 | 0le1 11820 | . . . . 5 ⊢ 0 ≤ 1 | |
| 5 | 2re 12398 | . . . . 5 ⊢ 2 ∈ ℝ | |
| 6 | 0le2 12426 | . . . . 5 ⊢ 0 ≤ 2 | |
| 7 | sqrtlt 15408 | . . . . 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 5128 | . 2 ⊢ 1 < (√‘2) |
| 11 | 2lt4 12501 | . . . 4 ⊢ 2 < 4 | |
| 12 | 4re 12408 | . . . . 5 ⊢ 4 ∈ ℝ | |
| 13 | 0re 11291 | . . . . . 6 ⊢ 0 ∈ ℝ | |
| 14 | 4pos 12434 | . . . . . 6 ⊢ 0 < 4 | |
| 15 | 13, 12, 14 | ltleii 11414 | . . . . 5 ⊢ 0 ≤ 4 |
| 16 | sqrtlt 15408 | . . . . 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 15419 | . . 3 ⊢ (√‘4) = 2 | |
| 20 | 18, 19 | breqtri 5130 | . 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 2145 class class class wbr 5103 ‘cfv 6531 ℝcr 11180 0cc0 11181 1c1 11182 < clt 11324 ≤ cle 11325 2c2 12378 4c4 12380 √csqrt 15380 |
| 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 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2733 ax-sep 5249 ax-nul 5260 ax-pow 5327 ax-pr 5391 ax-un 7740 ax-cnex 11237 ax-resscn 11238 ax-1cn 11239 ax-icn 11240 ax-addcl 11241 ax-addrcl 11242 ax-mulcl 11243 ax-mulrcl 11244 ax-mulcom 11245 ax-addass 11246 ax-mulass 11247 ax-distr 11248 ax-i2m1 11249 ax-1ne0 11250 ax-1rid 11251 ax-rnegex 11252 ax-rrecex 11253 ax-cnre 11254 ax-pre-lttri 11255 ax-pre-lttrn 11256 ax-pre-ltadd 11257 ax-pre-mulgt0 11258 ax-pre-sup 11259 |
| 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 2100 df-mo 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-nel 3063 df-ral 3078 df-rex 3088 df-rmo 3366 df-reu 3367 df-rab 3414 df-v 3453 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-pss 3919 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-iun 4953 df-br 5104 df-opab 5168 df-mpt 5187 df-tr 5213 df-id 5546 df-eprel 5551 df-po 5559 df-so 5560 df-fr 5604 df-we 5606 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-pred 6297 df-ord 6358 df-on 6359 df-lim 6360 df-suc 6361 df-iota 6487 df-fun 6533 df-fn 6534 df-f 6535 df-f1 6536 df-fo 6537 df-f1o 6538 df-fv 6539 df-riota 7369 df-ov 7415 df-oprab 7416 df-mpo 7417 df-om 7867 df-2nd 7991 df-frecs 8283 df-wrecs 8314 df-recs 8363 df-rdg 8402 df-er 8701 df-en 8958 df-dom 8959 df-sdom 8960 df-sup 9418 df-pnf 11326 df-mnf 11327 df-xr 11328 df-ltxr 11329 df-le 11330 df-sub 11524 df-neg 11525 df-div 11955 df-nn 12317 df-2 12386 df-3 12387 df-4 12388 df-n0 12588 df-z 12675 df-uz 12947 df-rp 13102 df-seq 14125 df-exp 14185 df-cj 15246 df-re 15247 df-im 15248 df-sqrt 15382 |
| This theorem is used by: (None) |
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