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Mirrors > Home > MPE Home > Th. List > sqrtdiv | Structured version Visualization version GIF version |
Description: Square root distributes over division. (Contributed by Mario Carneiro, 5-May-2016.) |
Ref | Expression |
---|---|
sqrtdiv | ⊢ (((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) ∧ 𝐵 ∈ ℝ+) → (√‘(𝐴 / 𝐵)) = ((√‘𝐴) / (√‘𝐵))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | rerpdivcl 12616 | . . . . . 6 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ+) → (𝐴 / 𝐵) ∈ ℝ) | |
2 | 1 | adantlr 715 | . . . . 5 ⊢ (((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) ∧ 𝐵 ∈ ℝ+) → (𝐴 / 𝐵) ∈ ℝ) |
3 | elrp 12588 | . . . . . 6 ⊢ (𝐵 ∈ ℝ+ ↔ (𝐵 ∈ ℝ ∧ 0 < 𝐵)) | |
4 | divge0 11701 | . . . . . 6 ⊢ (((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) ∧ (𝐵 ∈ ℝ ∧ 0 < 𝐵)) → 0 ≤ (𝐴 / 𝐵)) | |
5 | 3, 4 | sylan2b 597 | . . . . 5 ⊢ (((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) ∧ 𝐵 ∈ ℝ+) → 0 ≤ (𝐴 / 𝐵)) |
6 | resqrtcl 14817 | . . . . 5 ⊢ (((𝐴 / 𝐵) ∈ ℝ ∧ 0 ≤ (𝐴 / 𝐵)) → (√‘(𝐴 / 𝐵)) ∈ ℝ) | |
7 | 2, 5, 6 | syl2anc 587 | . . . 4 ⊢ (((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) ∧ 𝐵 ∈ ℝ+) → (√‘(𝐴 / 𝐵)) ∈ ℝ) |
8 | 7 | recnd 10861 | . . 3 ⊢ (((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) ∧ 𝐵 ∈ ℝ+) → (√‘(𝐴 / 𝐵)) ∈ ℂ) |
9 | rpsqrtcl 14828 | . . . . 5 ⊢ (𝐵 ∈ ℝ+ → (√‘𝐵) ∈ ℝ+) | |
10 | 9 | adantl 485 | . . . 4 ⊢ (((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) ∧ 𝐵 ∈ ℝ+) → (√‘𝐵) ∈ ℝ+) |
11 | 10 | rpcnd 12630 | . . 3 ⊢ (((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) ∧ 𝐵 ∈ ℝ+) → (√‘𝐵) ∈ ℂ) |
12 | 10 | rpne0d 12633 | . . 3 ⊢ (((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) ∧ 𝐵 ∈ ℝ+) → (√‘𝐵) ≠ 0) |
13 | 8, 11, 12 | divcan4d 11614 | . 2 ⊢ (((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) ∧ 𝐵 ∈ ℝ+) → (((√‘(𝐴 / 𝐵)) · (√‘𝐵)) / (√‘𝐵)) = (√‘(𝐴 / 𝐵))) |
14 | rprege0 12601 | . . . . . 6 ⊢ (𝐵 ∈ ℝ+ → (𝐵 ∈ ℝ ∧ 0 ≤ 𝐵)) | |
15 | 14 | adantl 485 | . . . . 5 ⊢ (((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) ∧ 𝐵 ∈ ℝ+) → (𝐵 ∈ ℝ ∧ 0 ≤ 𝐵)) |
16 | sqrtmul 14823 | . . . . 5 ⊢ ((((𝐴 / 𝐵) ∈ ℝ ∧ 0 ≤ (𝐴 / 𝐵)) ∧ (𝐵 ∈ ℝ ∧ 0 ≤ 𝐵)) → (√‘((𝐴 / 𝐵) · 𝐵)) = ((√‘(𝐴 / 𝐵)) · (√‘𝐵))) | |
17 | 2, 5, 15, 16 | syl21anc 838 | . . . 4 ⊢ (((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) ∧ 𝐵 ∈ ℝ+) → (√‘((𝐴 / 𝐵) · 𝐵)) = ((√‘(𝐴 / 𝐵)) · (√‘𝐵))) |
18 | simpll 767 | . . . . . . 7 ⊢ (((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) ∧ 𝐵 ∈ ℝ+) → 𝐴 ∈ ℝ) | |
19 | 18 | recnd 10861 | . . . . . 6 ⊢ (((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) ∧ 𝐵 ∈ ℝ+) → 𝐴 ∈ ℂ) |
20 | rpcn 12596 | . . . . . . 7 ⊢ (𝐵 ∈ ℝ+ → 𝐵 ∈ ℂ) | |
21 | 20 | adantl 485 | . . . . . 6 ⊢ (((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) ∧ 𝐵 ∈ ℝ+) → 𝐵 ∈ ℂ) |
22 | rpne0 12602 | . . . . . . 7 ⊢ (𝐵 ∈ ℝ+ → 𝐵 ≠ 0) | |
23 | 22 | adantl 485 | . . . . . 6 ⊢ (((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) ∧ 𝐵 ∈ ℝ+) → 𝐵 ≠ 0) |
24 | 19, 21, 23 | divcan1d 11609 | . . . . 5 ⊢ (((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) ∧ 𝐵 ∈ ℝ+) → ((𝐴 / 𝐵) · 𝐵) = 𝐴) |
25 | 24 | fveq2d 6721 | . . . 4 ⊢ (((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) ∧ 𝐵 ∈ ℝ+) → (√‘((𝐴 / 𝐵) · 𝐵)) = (√‘𝐴)) |
26 | 17, 25 | eqtr3d 2779 | . . 3 ⊢ (((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) ∧ 𝐵 ∈ ℝ+) → ((√‘(𝐴 / 𝐵)) · (√‘𝐵)) = (√‘𝐴)) |
27 | 26 | oveq1d 7228 | . 2 ⊢ (((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) ∧ 𝐵 ∈ ℝ+) → (((√‘(𝐴 / 𝐵)) · (√‘𝐵)) / (√‘𝐵)) = ((√‘𝐴) / (√‘𝐵))) |
28 | 13, 27 | eqtr3d 2779 | 1 ⊢ (((𝐴 ∈ ℝ ∧ 0 ≤ 𝐴) ∧ 𝐵 ∈ ℝ+) → (√‘(𝐴 / 𝐵)) = ((√‘𝐴) / (√‘𝐵))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 399 = wceq 1543 ∈ wcel 2110 ≠ wne 2940 class class class wbr 5053 ‘cfv 6380 (class class class)co 7213 ℂcc 10727 ℝcr 10728 0cc0 10729 · cmul 10734 < clt 10867 ≤ cle 10868 / cdiv 11489 ℝ+crp 12586 √csqrt 14796 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1976 ax-7 2016 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2158 ax-12 2175 ax-ext 2708 ax-sep 5192 ax-nul 5199 ax-pow 5258 ax-pr 5322 ax-un 7523 ax-cnex 10785 ax-resscn 10786 ax-1cn 10787 ax-icn 10788 ax-addcl 10789 ax-addrcl 10790 ax-mulcl 10791 ax-mulrcl 10792 ax-mulcom 10793 ax-addass 10794 ax-mulass 10795 ax-distr 10796 ax-i2m1 10797 ax-1ne0 10798 ax-1rid 10799 ax-rnegex 10800 ax-rrecex 10801 ax-cnre 10802 ax-pre-lttri 10803 ax-pre-lttrn 10804 ax-pre-ltadd 10805 ax-pre-mulgt0 10806 ax-pre-sup 10807 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 848 df-3or 1090 df-3an 1091 df-tru 1546 df-fal 1556 df-ex 1788 df-nf 1792 df-sb 2071 df-mo 2539 df-eu 2568 df-clab 2715 df-cleq 2729 df-clel 2816 df-nfc 2886 df-ne 2941 df-nel 3047 df-ral 3066 df-rex 3067 df-reu 3068 df-rmo 3069 df-rab 3070 df-v 3410 df-sbc 3695 df-csb 3812 df-dif 3869 df-un 3871 df-in 3873 df-ss 3883 df-pss 3885 df-nul 4238 df-if 4440 df-pw 4515 df-sn 4542 df-pr 4544 df-tp 4546 df-op 4548 df-uni 4820 df-iun 4906 df-br 5054 df-opab 5116 df-mpt 5136 df-tr 5162 df-id 5455 df-eprel 5460 df-po 5468 df-so 5469 df-fr 5509 df-we 5511 df-xp 5557 df-rel 5558 df-cnv 5559 df-co 5560 df-dm 5561 df-rn 5562 df-res 5563 df-ima 5564 df-pred 6160 df-ord 6216 df-on 6217 df-lim 6218 df-suc 6219 df-iota 6338 df-fun 6382 df-fn 6383 df-f 6384 df-f1 6385 df-fo 6386 df-f1o 6387 df-fv 6388 df-riota 7170 df-ov 7216 df-oprab 7217 df-mpo 7218 df-om 7645 df-2nd 7762 df-wrecs 8047 df-recs 8108 df-rdg 8146 df-er 8391 df-en 8627 df-dom 8628 df-sdom 8629 df-sup 9058 df-pnf 10869 df-mnf 10870 df-xr 10871 df-ltxr 10872 df-le 10873 df-sub 11064 df-neg 11065 df-div 11490 df-nn 11831 df-2 11893 df-3 11894 df-n0 12091 df-z 12177 df-uz 12439 df-rp 12587 df-seq 13575 df-exp 13636 df-cj 14662 df-re 14663 df-im 14664 df-sqrt 14798 |
This theorem is referenced by: sqrtdivd 14987 dchrisum0flblem2 26390 dchrisum0lem2a 26398 dchrisum0lem2 26399 |
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