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Mirrors > Home > MPE Home > Th. List > dvcnsqrt | Structured version Visualization version GIF version |
Description: Derivative of square root function. (Contributed by Brendan Leahy, 18-Dec-2018.) |
Ref | Expression |
---|---|
dvcncxp1.d | ⊢ 𝐷 = (ℂ ∖ (-∞(,]0)) |
Ref | Expression |
---|---|
dvcnsqrt | ⊢ (ℂ D (𝑥 ∈ 𝐷 ↦ (√‘𝑥))) = (𝑥 ∈ 𝐷 ↦ (1 / (2 · (√‘𝑥)))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | halfcn 11846 | . . 3 ⊢ (1 / 2) ∈ ℂ | |
2 | dvcncxp1.d | . . . 4 ⊢ 𝐷 = (ℂ ∖ (-∞(,]0)) | |
3 | 2 | dvcncxp1 25318 | . . 3 ⊢ ((1 / 2) ∈ ℂ → (ℂ D (𝑥 ∈ 𝐷 ↦ (𝑥↑𝑐(1 / 2)))) = (𝑥 ∈ 𝐷 ↦ ((1 / 2) · (𝑥↑𝑐((1 / 2) − 1))))) |
4 | 1, 3 | ax-mp 5 | . 2 ⊢ (ℂ D (𝑥 ∈ 𝐷 ↦ (𝑥↑𝑐(1 / 2)))) = (𝑥 ∈ 𝐷 ↦ ((1 / 2) · (𝑥↑𝑐((1 / 2) − 1)))) |
5 | difss 4107 | . . . . . . 7 ⊢ (ℂ ∖ (-∞(,]0)) ⊆ ℂ | |
6 | 2, 5 | eqsstri 4000 | . . . . . 6 ⊢ 𝐷 ⊆ ℂ |
7 | 6 | sseli 3962 | . . . . 5 ⊢ (𝑥 ∈ 𝐷 → 𝑥 ∈ ℂ) |
8 | cxpsqrt 25280 | . . . . 5 ⊢ (𝑥 ∈ ℂ → (𝑥↑𝑐(1 / 2)) = (√‘𝑥)) | |
9 | 7, 8 | syl 17 | . . . 4 ⊢ (𝑥 ∈ 𝐷 → (𝑥↑𝑐(1 / 2)) = (√‘𝑥)) |
10 | 9 | mpteq2ia 5149 | . . 3 ⊢ (𝑥 ∈ 𝐷 ↦ (𝑥↑𝑐(1 / 2))) = (𝑥 ∈ 𝐷 ↦ (√‘𝑥)) |
11 | 10 | oveq2i 7161 | . 2 ⊢ (ℂ D (𝑥 ∈ 𝐷 ↦ (𝑥↑𝑐(1 / 2)))) = (ℂ D (𝑥 ∈ 𝐷 ↦ (√‘𝑥))) |
12 | 1p0e1 11755 | . . . . . . . . . . 11 ⊢ (1 + 0) = 1 | |
13 | ax-1cn 10589 | . . . . . . . . . . . 12 ⊢ 1 ∈ ℂ | |
14 | 2halves 11859 | . . . . . . . . . . . 12 ⊢ (1 ∈ ℂ → ((1 / 2) + (1 / 2)) = 1) | |
15 | 13, 14 | ax-mp 5 | . . . . . . . . . . 11 ⊢ ((1 / 2) + (1 / 2)) = 1 |
16 | 12, 15 | eqtr4i 2847 | . . . . . . . . . 10 ⊢ (1 + 0) = ((1 / 2) + (1 / 2)) |
17 | 0cn 10627 | . . . . . . . . . . 11 ⊢ 0 ∈ ℂ | |
18 | addsubeq4 10895 | . . . . . . . . . . 11 ⊢ (((1 ∈ ℂ ∧ 0 ∈ ℂ) ∧ ((1 / 2) ∈ ℂ ∧ (1 / 2) ∈ ℂ)) → ((1 + 0) = ((1 / 2) + (1 / 2)) ↔ ((1 / 2) − 1) = (0 − (1 / 2)))) | |
19 | 13, 17, 1, 1, 18 | mp4an 691 | . . . . . . . . . 10 ⊢ ((1 + 0) = ((1 / 2) + (1 / 2)) ↔ ((1 / 2) − 1) = (0 − (1 / 2))) |
20 | 16, 19 | mpbi 232 | . . . . . . . . 9 ⊢ ((1 / 2) − 1) = (0 − (1 / 2)) |
21 | df-neg 10867 | . . . . . . . . 9 ⊢ -(1 / 2) = (0 − (1 / 2)) | |
22 | 20, 21 | eqtr4i 2847 | . . . . . . . 8 ⊢ ((1 / 2) − 1) = -(1 / 2) |
23 | 22 | oveq2i 7161 | . . . . . . 7 ⊢ (𝑥↑𝑐((1 / 2) − 1)) = (𝑥↑𝑐-(1 / 2)) |
24 | 2 | logdmn0 25217 | . . . . . . . 8 ⊢ (𝑥 ∈ 𝐷 → 𝑥 ≠ 0) |
25 | 1 | a1i 11 | . . . . . . . 8 ⊢ (𝑥 ∈ 𝐷 → (1 / 2) ∈ ℂ) |
26 | 7, 24, 25 | cxpnegd 25292 | . . . . . . 7 ⊢ (𝑥 ∈ 𝐷 → (𝑥↑𝑐-(1 / 2)) = (1 / (𝑥↑𝑐(1 / 2)))) |
27 | 23, 26 | syl5eq 2868 | . . . . . 6 ⊢ (𝑥 ∈ 𝐷 → (𝑥↑𝑐((1 / 2) − 1)) = (1 / (𝑥↑𝑐(1 / 2)))) |
28 | 9 | oveq2d 7166 | . . . . . 6 ⊢ (𝑥 ∈ 𝐷 → (1 / (𝑥↑𝑐(1 / 2))) = (1 / (√‘𝑥))) |
29 | 27, 28 | eqtrd 2856 | . . . . 5 ⊢ (𝑥 ∈ 𝐷 → (𝑥↑𝑐((1 / 2) − 1)) = (1 / (√‘𝑥))) |
30 | 29 | oveq2d 7166 | . . . 4 ⊢ (𝑥 ∈ 𝐷 → ((1 / 2) · (𝑥↑𝑐((1 / 2) − 1))) = ((1 / 2) · (1 / (√‘𝑥)))) |
31 | 1cnd 10630 | . . . . . 6 ⊢ (𝑥 ∈ 𝐷 → 1 ∈ ℂ) | |
32 | 2cnd 11709 | . . . . . 6 ⊢ (𝑥 ∈ 𝐷 → 2 ∈ ℂ) | |
33 | 7 | sqrtcld 14791 | . . . . . 6 ⊢ (𝑥 ∈ 𝐷 → (√‘𝑥) ∈ ℂ) |
34 | 2ne0 11735 | . . . . . . 7 ⊢ 2 ≠ 0 | |
35 | 34 | a1i 11 | . . . . . 6 ⊢ (𝑥 ∈ 𝐷 → 2 ≠ 0) |
36 | 7 | adantr 483 | . . . . . . . . . 10 ⊢ ((𝑥 ∈ 𝐷 ∧ (√‘𝑥) = 0) → 𝑥 ∈ ℂ) |
37 | simpr 487 | . . . . . . . . . 10 ⊢ ((𝑥 ∈ 𝐷 ∧ (√‘𝑥) = 0) → (√‘𝑥) = 0) | |
38 | 36, 37 | sqr00d 14795 | . . . . . . . . 9 ⊢ ((𝑥 ∈ 𝐷 ∧ (√‘𝑥) = 0) → 𝑥 = 0) |
39 | 38 | ex 415 | . . . . . . . 8 ⊢ (𝑥 ∈ 𝐷 → ((√‘𝑥) = 0 → 𝑥 = 0)) |
40 | 39 | necon3d 3037 | . . . . . . 7 ⊢ (𝑥 ∈ 𝐷 → (𝑥 ≠ 0 → (√‘𝑥) ≠ 0)) |
41 | 24, 40 | mpd 15 | . . . . . 6 ⊢ (𝑥 ∈ 𝐷 → (√‘𝑥) ≠ 0) |
42 | 31, 32, 31, 33, 35, 41 | divmuldivd 11451 | . . . . 5 ⊢ (𝑥 ∈ 𝐷 → ((1 / 2) · (1 / (√‘𝑥))) = ((1 · 1) / (2 · (√‘𝑥)))) |
43 | 1t1e1 11793 | . . . . . 6 ⊢ (1 · 1) = 1 | |
44 | 43 | oveq1i 7160 | . . . . 5 ⊢ ((1 · 1) / (2 · (√‘𝑥))) = (1 / (2 · (√‘𝑥))) |
45 | 42, 44 | syl6eq 2872 | . . . 4 ⊢ (𝑥 ∈ 𝐷 → ((1 / 2) · (1 / (√‘𝑥))) = (1 / (2 · (√‘𝑥)))) |
46 | 30, 45 | eqtrd 2856 | . . 3 ⊢ (𝑥 ∈ 𝐷 → ((1 / 2) · (𝑥↑𝑐((1 / 2) − 1))) = (1 / (2 · (√‘𝑥)))) |
47 | 46 | mpteq2ia 5149 | . 2 ⊢ (𝑥 ∈ 𝐷 ↦ ((1 / 2) · (𝑥↑𝑐((1 / 2) − 1)))) = (𝑥 ∈ 𝐷 ↦ (1 / (2 · (√‘𝑥)))) |
48 | 4, 11, 47 | 3eqtr3i 2852 | 1 ⊢ (ℂ D (𝑥 ∈ 𝐷 ↦ (√‘𝑥))) = (𝑥 ∈ 𝐷 ↦ (1 / (2 · (√‘𝑥)))) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 208 ∧ wa 398 = wceq 1533 ∈ wcel 2110 ≠ wne 3016 ∖ cdif 3932 ↦ cmpt 5138 ‘cfv 6349 (class class class)co 7150 ℂcc 10529 0cc0 10531 1c1 10532 + caddc 10534 · cmul 10536 -∞cmnf 10667 − cmin 10864 -cneg 10865 / cdiv 11291 2c2 11686 (,]cioc 12733 √csqrt 14586 D cdv 24455 ↑𝑐ccxp 25133 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2157 ax-12 2173 ax-ext 2793 ax-rep 5182 ax-sep 5195 ax-nul 5202 ax-pow 5258 ax-pr 5321 ax-un 7455 ax-inf2 9098 ax-cnex 10587 ax-resscn 10588 ax-1cn 10589 ax-icn 10590 ax-addcl 10591 ax-addrcl 10592 ax-mulcl 10593 ax-mulrcl 10594 ax-mulcom 10595 ax-addass 10596 ax-mulass 10597 ax-distr 10598 ax-i2m1 10599 ax-1ne0 10600 ax-1rid 10601 ax-rnegex 10602 ax-rrecex 10603 ax-cnre 10604 ax-pre-lttri 10605 ax-pre-lttrn 10606 ax-pre-ltadd 10607 ax-pre-mulgt0 10608 ax-pre-sup 10609 ax-addf 10610 ax-mulf 10611 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1536 df-fal 1546 df-ex 1777 df-nf 1781 df-sb 2066 df-mo 2618 df-eu 2650 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-nel 3124 df-ral 3143 df-rex 3144 df-reu 3145 df-rmo 3146 df-rab 3147 df-v 3496 df-sbc 3772 df-csb 3883 df-dif 3938 df-un 3940 df-in 3942 df-ss 3951 df-pss 3953 df-nul 4291 df-if 4467 df-pw 4540 df-sn 4561 df-pr 4563 df-tp 4565 df-op 4567 df-uni 4832 df-int 4869 df-iun 4913 df-iin 4914 df-br 5059 df-opab 5121 df-mpt 5139 df-tr 5165 df-id 5454 df-eprel 5459 df-po 5468 df-so 5469 df-fr 5508 df-se 5509 df-we 5510 df-xp 5555 df-rel 5556 df-cnv 5557 df-co 5558 df-dm 5559 df-rn 5560 df-res 5561 df-ima 5562 df-pred 6142 df-ord 6188 df-on 6189 df-lim 6190 df-suc 6191 df-iota 6308 df-fun 6351 df-fn 6352 df-f 6353 df-f1 6354 df-fo 6355 df-f1o 6356 df-fv 6357 df-isom 6358 df-riota 7108 df-ov 7153 df-oprab 7154 df-mpo 7155 df-of 7403 df-om 7575 df-1st 7683 df-2nd 7684 df-supp 7825 df-wrecs 7941 df-recs 8002 df-rdg 8040 df-1o 8096 df-2o 8097 df-oadd 8100 df-er 8283 df-map 8402 df-pm 8403 df-ixp 8456 df-en 8504 df-dom 8505 df-sdom 8506 df-fin 8507 df-fsupp 8828 df-fi 8869 df-sup 8900 df-inf 8901 df-oi 8968 df-card 9362 df-pnf 10671 df-mnf 10672 df-xr 10673 df-ltxr 10674 df-le 10675 df-sub 10866 df-neg 10867 df-div 11292 df-nn 11633 df-2 11694 df-3 11695 df-4 11696 df-5 11697 df-6 11698 df-7 11699 df-8 11700 df-9 11701 df-n0 11892 df-z 11976 df-dec 12093 df-uz 12238 df-q 12343 df-rp 12384 df-xneg 12501 df-xadd 12502 df-xmul 12503 df-ioo 12736 df-ioc 12737 df-ico 12738 df-icc 12739 df-fz 12887 df-fzo 13028 df-fl 13156 df-mod 13232 df-seq 13364 df-exp 13424 df-fac 13628 df-bc 13657 df-hash 13685 df-shft 14420 df-cj 14452 df-re 14453 df-im 14454 df-sqrt 14588 df-abs 14589 df-limsup 14822 df-clim 14839 df-rlim 14840 df-sum 15037 df-ef 15415 df-sin 15417 df-cos 15418 df-tan 15419 df-pi 15420 df-struct 16479 df-ndx 16480 df-slot 16481 df-base 16483 df-sets 16484 df-ress 16485 df-plusg 16572 df-mulr 16573 df-starv 16574 df-sca 16575 df-vsca 16576 df-ip 16577 df-tset 16578 df-ple 16579 df-ds 16581 df-unif 16582 df-hom 16583 df-cco 16584 df-rest 16690 df-topn 16691 df-0g 16709 df-gsum 16710 df-topgen 16711 df-pt 16712 df-prds 16715 df-xrs 16769 df-qtop 16774 df-imas 16775 df-xps 16777 df-mre 16851 df-mrc 16852 df-acs 16854 df-mgm 17846 df-sgrp 17895 df-mnd 17906 df-submnd 17951 df-mulg 18219 df-cntz 18441 df-cmn 18902 df-psmet 20531 df-xmet 20532 df-met 20533 df-bl 20534 df-mopn 20535 df-fbas 20536 df-fg 20537 df-cnfld 20540 df-top 21496 df-topon 21513 df-topsp 21535 df-bases 21548 df-cld 21621 df-ntr 21622 df-cls 21623 df-nei 21700 df-lp 21738 df-perf 21739 df-cn 21829 df-cnp 21830 df-haus 21917 df-cmp 21989 df-tx 22164 df-hmeo 22357 df-fil 22448 df-fm 22540 df-flim 22541 df-flf 22542 df-xms 22924 df-ms 22925 df-tms 22926 df-cncf 23480 df-limc 24458 df-dv 24459 df-log 25134 df-cxp 25135 |
This theorem is referenced by: dvasin 34972 |
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