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Mirrors > Home > ILE Home > Th. List > resqrtcl | GIF version |
Description: Closure of the square root function. (Contributed by Mario Carneiro, 9-Jul-2013.) |
Ref | Expression |
---|---|
resqrtcl | ⊢ ((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) → (√‘𝐴) ∈ ℝ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | resqrex 10977 | . 2 ⊢ ((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) → ∃𝑦 ∈ ℝ (0 ≤ 𝑦 ∧ (𝑦↑2) = 𝐴)) | |
2 | simp1l 1016 | . . . . . 6 ⊢ (((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) ∧ 𝑦 ∈ ℝ ∧ (0 ≤ 𝑦 ∧ (𝑦↑2) = 𝐴)) → 𝐴 ∈ ℝ) | |
3 | sqrtrval 10951 | . . . . . 6 ⊢ (𝐴 ∈ ℝ → (√‘𝐴) = (℩𝑥 ∈ ℝ ((𝑥↑2) = 𝐴 ∧ 0 ≤ 𝑥))) | |
4 | 2, 3 | syl 14 | . . . . 5 ⊢ (((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) ∧ 𝑦 ∈ ℝ ∧ (0 ≤ 𝑦 ∧ (𝑦↑2) = 𝐴)) → (√‘𝐴) = (℩𝑥 ∈ ℝ ((𝑥↑2) = 𝐴 ∧ 0 ≤ 𝑥))) |
5 | simp3r 1021 | . . . . . 6 ⊢ (((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) ∧ 𝑦 ∈ ℝ ∧ (0 ≤ 𝑦 ∧ (𝑦↑2) = 𝐴)) → (𝑦↑2) = 𝐴) | |
6 | simp3l 1020 | . . . . . 6 ⊢ (((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) ∧ 𝑦 ∈ ℝ ∧ (0 ≤ 𝑦 ∧ (𝑦↑2) = 𝐴)) → 0 ≤ 𝑦) | |
7 | simp2 993 | . . . . . . 7 ⊢ (((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) ∧ 𝑦 ∈ ℝ ∧ (0 ≤ 𝑦 ∧ (𝑦↑2) = 𝐴)) → 𝑦 ∈ ℝ) | |
8 | rersqreu 10979 | . . . . . . . 8 ⊢ ((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) → ∃!𝑥 ∈ ℝ ((𝑥↑2) = 𝐴 ∧ 0 ≤ 𝑥)) | |
9 | 8 | 3ad2ant1 1013 | . . . . . . 7 ⊢ (((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) ∧ 𝑦 ∈ ℝ ∧ (0 ≤ 𝑦 ∧ (𝑦↑2) = 𝐴)) → ∃!𝑥 ∈ ℝ ((𝑥↑2) = 𝐴 ∧ 0 ≤ 𝑥)) |
10 | oveq1 5857 | . . . . . . . . . 10 ⊢ (𝑥 = 𝑦 → (𝑥↑2) = (𝑦↑2)) | |
11 | 10 | eqeq1d 2179 | . . . . . . . . 9 ⊢ (𝑥 = 𝑦 → ((𝑥↑2) = 𝐴 ↔ (𝑦↑2) = 𝐴)) |
12 | breq2 3991 | . . . . . . . . 9 ⊢ (𝑥 = 𝑦 → (0 ≤ 𝑥 ↔ 0 ≤ 𝑦)) | |
13 | 11, 12 | anbi12d 470 | . . . . . . . 8 ⊢ (𝑥 = 𝑦 → (((𝑥↑2) = 𝐴 ∧ 0 ≤ 𝑥) ↔ ((𝑦↑2) = 𝐴 ∧ 0 ≤ 𝑦))) |
14 | 13 | riota2 5828 | . . . . . . 7 ⊢ ((𝑦 ∈ ℝ ∧ ∃!𝑥 ∈ ℝ ((𝑥↑2) = 𝐴 ∧ 0 ≤ 𝑥)) → (((𝑦↑2) = 𝐴 ∧ 0 ≤ 𝑦) ↔ (℩𝑥 ∈ ℝ ((𝑥↑2) = 𝐴 ∧ 0 ≤ 𝑥)) = 𝑦)) |
15 | 7, 9, 14 | syl2anc 409 | . . . . . 6 ⊢ (((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) ∧ 𝑦 ∈ ℝ ∧ (0 ≤ 𝑦 ∧ (𝑦↑2) = 𝐴)) → (((𝑦↑2) = 𝐴 ∧ 0 ≤ 𝑦) ↔ (℩𝑥 ∈ ℝ ((𝑥↑2) = 𝐴 ∧ 0 ≤ 𝑥)) = 𝑦)) |
16 | 5, 6, 15 | mpbi2and 938 | . . . . 5 ⊢ (((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) ∧ 𝑦 ∈ ℝ ∧ (0 ≤ 𝑦 ∧ (𝑦↑2) = 𝐴)) → (℩𝑥 ∈ ℝ ((𝑥↑2) = 𝐴 ∧ 0 ≤ 𝑥)) = 𝑦) |
17 | 4, 16 | eqtrd 2203 | . . . 4 ⊢ (((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) ∧ 𝑦 ∈ ℝ ∧ (0 ≤ 𝑦 ∧ (𝑦↑2) = 𝐴)) → (√‘𝐴) = 𝑦) |
18 | 17, 7 | eqeltrd 2247 | . . 3 ⊢ (((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) ∧ 𝑦 ∈ ℝ ∧ (0 ≤ 𝑦 ∧ (𝑦↑2) = 𝐴)) → (√‘𝐴) ∈ ℝ) |
19 | 18 | rexlimdv3a 2589 | . 2 ⊢ ((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) → (∃𝑦 ∈ ℝ (0 ≤ 𝑦 ∧ (𝑦↑2) = 𝐴) → (√‘𝐴) ∈ ℝ)) |
20 | 1, 19 | mpd 13 | 1 ⊢ ((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) → (√‘𝐴) ∈ ℝ) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 103 ↔ wb 104 ∧ w3a 973 = wceq 1348 ∈ wcel 2141 ∃wrex 2449 ∃!wreu 2450 class class class wbr 3987 ‘cfv 5196 ℩crio 5805 (class class class)co 5850 ℝcr 7760 0cc0 7761 ≤ cle 7942 2c2 8916 ↑cexp 10462 √csqrt 10947 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 609 ax-in2 610 ax-io 704 ax-5 1440 ax-7 1441 ax-gen 1442 ax-ie1 1486 ax-ie2 1487 ax-8 1497 ax-10 1498 ax-11 1499 ax-i12 1500 ax-bndl 1502 ax-4 1503 ax-17 1519 ax-i9 1523 ax-ial 1527 ax-i5r 1528 ax-13 2143 ax-14 2144 ax-ext 2152 ax-coll 4102 ax-sep 4105 ax-nul 4113 ax-pow 4158 ax-pr 4192 ax-un 4416 ax-setind 4519 ax-iinf 4570 ax-cnex 7852 ax-resscn 7853 ax-1cn 7854 ax-1re 7855 ax-icn 7856 ax-addcl 7857 ax-addrcl 7858 ax-mulcl 7859 ax-mulrcl 7860 ax-addcom 7861 ax-mulcom 7862 ax-addass 7863 ax-mulass 7864 ax-distr 7865 ax-i2m1 7866 ax-0lt1 7867 ax-1rid 7868 ax-0id 7869 ax-rnegex 7870 ax-precex 7871 ax-cnre 7872 ax-pre-ltirr 7873 ax-pre-ltwlin 7874 ax-pre-lttrn 7875 ax-pre-apti 7876 ax-pre-ltadd 7877 ax-pre-mulgt0 7878 ax-pre-mulext 7879 ax-arch 7880 ax-caucvg 7881 |
This theorem depends on definitions: df-bi 116 df-dc 830 df-3or 974 df-3an 975 df-tru 1351 df-fal 1354 df-nf 1454 df-sb 1756 df-eu 2022 df-mo 2023 df-clab 2157 df-cleq 2163 df-clel 2166 df-nfc 2301 df-ne 2341 df-nel 2436 df-ral 2453 df-rex 2454 df-reu 2455 df-rmo 2456 df-rab 2457 df-v 2732 df-sbc 2956 df-csb 3050 df-dif 3123 df-un 3125 df-in 3127 df-ss 3134 df-nul 3415 df-if 3526 df-pw 3566 df-sn 3587 df-pr 3588 df-op 3590 df-uni 3795 df-int 3830 df-iun 3873 df-br 3988 df-opab 4049 df-mpt 4050 df-tr 4086 df-id 4276 df-po 4279 df-iso 4280 df-iord 4349 df-on 4351 df-ilim 4352 df-suc 4354 df-iom 4573 df-xp 4615 df-rel 4616 df-cnv 4617 df-co 4618 df-dm 4619 df-rn 4620 df-res 4621 df-ima 4622 df-iota 5158 df-fun 5198 df-fn 5199 df-f 5200 df-f1 5201 df-fo 5202 df-f1o 5203 df-fv 5204 df-riota 5806 df-ov 5853 df-oprab 5854 df-mpo 5855 df-1st 6116 df-2nd 6117 df-recs 6281 df-frec 6367 df-pnf 7943 df-mnf 7944 df-xr 7945 df-ltxr 7946 df-le 7947 df-sub 8079 df-neg 8080 df-reap 8481 df-ap 8488 df-div 8577 df-inn 8866 df-2 8924 df-3 8925 df-4 8926 df-n0 9123 df-z 9200 df-uz 9475 df-rp 9598 df-seqfrec 10389 df-exp 10463 df-rsqrt 10949 |
This theorem is referenced by: rersqrtthlem 10981 remsqsqrt 10983 sqrtgt0 10985 sqrtmul 10986 sqrtle 10987 sqrtlt 10988 sqrt11ap 10989 sqrt11 10990 rpsqrtcl 10992 sqrtdiv 10993 sqrtsq2 10994 abscl 11002 amgm2 11069 sqrtcli 11071 resqrtcld 11114 |
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