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| Mirrors > Home > MPE Home > Th. List > 01sqrexlem2 | Structured version Visualization version GIF version | ||
| Description: Lemma for 01sqrex 15396. (Contributed by Mario Carneiro, 10-Jul-2013.) |
| Ref | Expression |
|---|---|
| 01sqrexlem1.1 | ⊢ 𝑆 = {𝑥 ∈ ℝ+ ∣ (𝑥↑2) ≤ 𝐴} |
| 01sqrexlem1.2 | ⊢ 𝐵 = sup(𝑆, ℝ, < ) |
| Ref | Expression |
|---|---|
| 01sqrexlem2 | ⊢ ((𝐴 ∈ ℝ+ ∧ 𝐴 ≤ 1) → 𝐴 ∈ 𝑆) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | simpl 488 | . 2 ⊢ ((𝐴 ∈ ℝ+ ∧ 𝐴 ≤ 1) → 𝐴 ∈ ℝ+) | |
| 2 | rpre 13110 | . . . . 5 ⊢ (𝐴 ∈ ℝ+ → 𝐴 ∈ ℝ) | |
| 3 | rpgt0 13114 | . . . . 5 ⊢ (𝐴 ∈ ℝ+ → 0 < 𝐴) | |
| 4 | 1re 11289 | . . . . . 6 ⊢ 1 ∈ ℝ | |
| 5 | lemul1 12150 | . . . . . 6 ⊢ ((𝐴 ∈ ℝ ∧ 1 ∈ ℝ ∧ (𝐴 ∈ ℝ ∧ 0 < 𝐴)) → (𝐴 ≤ 1 ↔ (𝐴 · 𝐴) ≤ (1 · 𝐴))) | |
| 6 | 4, 5 | mp3an2 1478 | . . . . 5 ⊢ ((𝐴 ∈ ℝ ∧ (𝐴 ∈ ℝ ∧ 0 < 𝐴)) → (𝐴 ≤ 1 ↔ (𝐴 · 𝐴) ≤ (1 · 𝐴))) |
| 7 | 2, 2, 3, 6 | syl12anc 850 | . . . 4 ⊢ (𝐴 ∈ ℝ+ → (𝐴 ≤ 1 ↔ (𝐴 · 𝐴) ≤ (1 · 𝐴))) |
| 8 | 7 | biimpa 482 | . . 3 ⊢ ((𝐴 ∈ ℝ+ ∧ 𝐴 ≤ 1) → (𝐴 · 𝐴) ≤ (1 · 𝐴)) |
| 9 | rpcn 13112 | . . . . 5 ⊢ (𝐴 ∈ ℝ+ → 𝐴 ∈ ℂ) | |
| 10 | 9 | adantr 486 | . . . 4 ⊢ ((𝐴 ∈ ℝ+ ∧ 𝐴 ≤ 1) → 𝐴 ∈ ℂ) |
| 11 | sqval 14237 | . . . . 5 ⊢ (𝐴 ∈ ℂ → (𝐴↑2) = (𝐴 · 𝐴)) | |
| 12 | 11 | eqcomd 2767 | . . . 4 ⊢ (𝐴 ∈ ℂ → (𝐴 · 𝐴) = (𝐴↑2)) |
| 13 | 10, 12 | syl 18 | . . 3 ⊢ ((𝐴 ∈ ℝ+ ∧ 𝐴 ≤ 1) → (𝐴 · 𝐴) = (𝐴↑2)) |
| 14 | 9 | mullidd 11308 | . . . 4 ⊢ (𝐴 ∈ ℝ+ → (1 · 𝐴) = 𝐴) |
| 15 | 14 | adantr 486 | . . 3 ⊢ ((𝐴 ∈ ℝ+ ∧ 𝐴 ≤ 1) → (1 · 𝐴) = 𝐴) |
| 16 | 8, 13, 15 | 3brtr3d 5136 | . 2 ⊢ ((𝐴 ∈ ℝ+ ∧ 𝐴 ≤ 1) → (𝐴↑2) ≤ 𝐴) |
| 17 | oveq1 7419 | . . . 4 ⊢ (𝑥 = 𝐴 → (𝑥↑2) = (𝐴↑2)) | |
| 18 | 17 | breq1d 5113 | . . 3 ⊢ (𝑥 = 𝐴 → ((𝑥↑2) ≤ 𝐴 ↔ (𝐴↑2) ≤ 𝐴)) |
| 19 | 01sqrexlem1.1 | . . 3 ⊢ 𝑆 = {𝑥 ∈ ℝ+ ∣ (𝑥↑2) ≤ 𝐴} | |
| 20 | 18, 19 | elrab2 3649 | . 2 ⊢ (𝐴 ∈ 𝑆 ↔ (𝐴 ∈ ℝ+ ∧ (𝐴↑2) ≤ 𝐴)) |
| 21 | 1, 16, 20 | sylanbrc 595 | 1 ⊢ ((𝐴 ∈ ℝ+ ∧ 𝐴 ≤ 1) → 𝐴 ∈ 𝑆) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ wa 401 = wceq 1570 ∈ wcel 2145 {crab 3413 class class class wbr 5103 (class class class)co 7412 supcsup 9416 ℂcc 11179 ℝcr 11180 0cc0 11181 1c1 11182 · cmul 11186 < clt 11324 ≤ cle 11325 2c2 12378 ℝ+crp 13101 ↑cexp 14184 |
| 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 |
| 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-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-pnf 11326 df-mnf 11327 df-xr 11328 df-ltxr 11329 df-le 11330 df-sub 11524 df-neg 11525 df-nn 12317 df-2 12386 df-n0 12588 df-z 12675 df-uz 12947 df-rp 13102 df-seq 14125 df-exp 14185 |
| This theorem is used by: 01sqrexlem3 15391 01sqrexlem4 15392 |
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