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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 12479 | . . 3 ⊢ (1 / 2) ∈ ℂ | |
2 | dvcncxp1.d | . . . 4 ⊢ 𝐷 = (ℂ ∖ (-∞(,]0)) | |
3 | 2 | dvcncxp1 26800 | . . 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 4146 | . . . . . . 7 ⊢ (ℂ ∖ (-∞(,]0)) ⊆ ℂ | |
6 | 2, 5 | eqsstri 4030 | . . . . . 6 ⊢ 𝐷 ⊆ ℂ |
7 | 6 | sseli 3991 | . . . . 5 ⊢ (𝑥 ∈ 𝐷 → 𝑥 ∈ ℂ) |
8 | cxpsqrt 26760 | . . . . 5 ⊢ (𝑥 ∈ ℂ → (𝑥↑𝑐(1 / 2)) = (√‘𝑥)) | |
9 | 7, 8 | syl 17 | . . . 4 ⊢ (𝑥 ∈ 𝐷 → (𝑥↑𝑐(1 / 2)) = (√‘𝑥)) |
10 | 9 | mpteq2ia 5251 | . . 3 ⊢ (𝑥 ∈ 𝐷 ↦ (𝑥↑𝑐(1 / 2))) = (𝑥 ∈ 𝐷 ↦ (√‘𝑥)) |
11 | 10 | oveq2i 7442 | . 2 ⊢ (ℂ D (𝑥 ∈ 𝐷 ↦ (𝑥↑𝑐(1 / 2)))) = (ℂ D (𝑥 ∈ 𝐷 ↦ (√‘𝑥))) |
12 | 1p0e1 12388 | . . . . . . . . . . 11 ⊢ (1 + 0) = 1 | |
13 | ax-1cn 11211 | . . . . . . . . . . . 12 ⊢ 1 ∈ ℂ | |
14 | 2halves 12492 | . . . . . . . . . . . 12 ⊢ (1 ∈ ℂ → ((1 / 2) + (1 / 2)) = 1) | |
15 | 13, 14 | ax-mp 5 | . . . . . . . . . . 11 ⊢ ((1 / 2) + (1 / 2)) = 1 |
16 | 12, 15 | eqtr4i 2766 | . . . . . . . . . 10 ⊢ (1 + 0) = ((1 / 2) + (1 / 2)) |
17 | 0cn 11251 | . . . . . . . . . . 11 ⊢ 0 ∈ ℂ | |
18 | addsubeq4 11521 | . . . . . . . . . . 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 693 | . . . . . . . . . 10 ⊢ ((1 + 0) = ((1 / 2) + (1 / 2)) ↔ ((1 / 2) − 1) = (0 − (1 / 2))) |
20 | 16, 19 | mpbi 230 | . . . . . . . . 9 ⊢ ((1 / 2) − 1) = (0 − (1 / 2)) |
21 | df-neg 11493 | . . . . . . . . 9 ⊢ -(1 / 2) = (0 − (1 / 2)) | |
22 | 20, 21 | eqtr4i 2766 | . . . . . . . 8 ⊢ ((1 / 2) − 1) = -(1 / 2) |
23 | 22 | oveq2i 7442 | . . . . . . 7 ⊢ (𝑥↑𝑐((1 / 2) − 1)) = (𝑥↑𝑐-(1 / 2)) |
24 | 2 | logdmn0 26697 | . . . . . . . 8 ⊢ (𝑥 ∈ 𝐷 → 𝑥 ≠ 0) |
25 | 1 | a1i 11 | . . . . . . . 8 ⊢ (𝑥 ∈ 𝐷 → (1 / 2) ∈ ℂ) |
26 | 7, 24, 25 | cxpnegd 26772 | . . . . . . 7 ⊢ (𝑥 ∈ 𝐷 → (𝑥↑𝑐-(1 / 2)) = (1 / (𝑥↑𝑐(1 / 2)))) |
27 | 23, 26 | eqtrid 2787 | . . . . . 6 ⊢ (𝑥 ∈ 𝐷 → (𝑥↑𝑐((1 / 2) − 1)) = (1 / (𝑥↑𝑐(1 / 2)))) |
28 | 9 | oveq2d 7447 | . . . . . 6 ⊢ (𝑥 ∈ 𝐷 → (1 / (𝑥↑𝑐(1 / 2))) = (1 / (√‘𝑥))) |
29 | 27, 28 | eqtrd 2775 | . . . . 5 ⊢ (𝑥 ∈ 𝐷 → (𝑥↑𝑐((1 / 2) − 1)) = (1 / (√‘𝑥))) |
30 | 29 | oveq2d 7447 | . . . 4 ⊢ (𝑥 ∈ 𝐷 → ((1 / 2) · (𝑥↑𝑐((1 / 2) − 1))) = ((1 / 2) · (1 / (√‘𝑥)))) |
31 | 1cnd 11254 | . . . . . 6 ⊢ (𝑥 ∈ 𝐷 → 1 ∈ ℂ) | |
32 | 2cnd 12342 | . . . . . 6 ⊢ (𝑥 ∈ 𝐷 → 2 ∈ ℂ) | |
33 | 7 | sqrtcld 15473 | . . . . . 6 ⊢ (𝑥 ∈ 𝐷 → (√‘𝑥) ∈ ℂ) |
34 | 2ne0 12368 | . . . . . . 7 ⊢ 2 ≠ 0 | |
35 | 34 | a1i 11 | . . . . . 6 ⊢ (𝑥 ∈ 𝐷 → 2 ≠ 0) |
36 | 7 | adantr 480 | . . . . . . . . . 10 ⊢ ((𝑥 ∈ 𝐷 ∧ (√‘𝑥) = 0) → 𝑥 ∈ ℂ) |
37 | simpr 484 | . . . . . . . . . 10 ⊢ ((𝑥 ∈ 𝐷 ∧ (√‘𝑥) = 0) → (√‘𝑥) = 0) | |
38 | 36, 37 | sqr00d 15477 | . . . . . . . . 9 ⊢ ((𝑥 ∈ 𝐷 ∧ (√‘𝑥) = 0) → 𝑥 = 0) |
39 | 38 | ex 412 | . . . . . . . 8 ⊢ (𝑥 ∈ 𝐷 → ((√‘𝑥) = 0 → 𝑥 = 0)) |
40 | 39 | necon3d 2959 | . . . . . . 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 12082 | . . . . 5 ⊢ (𝑥 ∈ 𝐷 → ((1 / 2) · (1 / (√‘𝑥))) = ((1 · 1) / (2 · (√‘𝑥)))) |
43 | 1t1e1 12426 | . . . . . 6 ⊢ (1 · 1) = 1 | |
44 | 43 | oveq1i 7441 | . . . . 5 ⊢ ((1 · 1) / (2 · (√‘𝑥))) = (1 / (2 · (√‘𝑥))) |
45 | 42, 44 | eqtrdi 2791 | . . . 4 ⊢ (𝑥 ∈ 𝐷 → ((1 / 2) · (1 / (√‘𝑥))) = (1 / (2 · (√‘𝑥)))) |
46 | 30, 45 | eqtrd 2775 | . . 3 ⊢ (𝑥 ∈ 𝐷 → ((1 / 2) · (𝑥↑𝑐((1 / 2) − 1))) = (1 / (2 · (√‘𝑥)))) |
47 | 46 | mpteq2ia 5251 | . 2 ⊢ (𝑥 ∈ 𝐷 ↦ ((1 / 2) · (𝑥↑𝑐((1 / 2) − 1)))) = (𝑥 ∈ 𝐷 ↦ (1 / (2 · (√‘𝑥)))) |
48 | 4, 11, 47 | 3eqtr3i 2771 | 1 ⊢ (ℂ D (𝑥 ∈ 𝐷 ↦ (√‘𝑥))) = (𝑥 ∈ 𝐷 ↦ (1 / (2 · (√‘𝑥)))) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 206 ∧ wa 395 = wceq 1537 ∈ wcel 2106 ≠ wne 2938 ∖ cdif 3960 ↦ cmpt 5231 ‘cfv 6563 (class class class)co 7431 ℂcc 11151 0cc0 11153 1c1 11154 + caddc 11156 · cmul 11158 -∞cmnf 11291 − cmin 11490 -cneg 11491 / cdiv 11918 2c2 12319 (,]cioc 13385 √csqrt 15269 D cdv 25913 ↑𝑐ccxp 26612 |
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 1908 ax-6 1965 ax-7 2005 ax-8 2108 ax-9 2116 ax-10 2139 ax-11 2155 ax-12 2175 ax-ext 2706 ax-rep 5285 ax-sep 5302 ax-nul 5312 ax-pow 5371 ax-pr 5438 ax-un 7754 ax-inf2 9679 ax-cnex 11209 ax-resscn 11210 ax-1cn 11211 ax-icn 11212 ax-addcl 11213 ax-addrcl 11214 ax-mulcl 11215 ax-mulrcl 11216 ax-mulcom 11217 ax-addass 11218 ax-mulass 11219 ax-distr 11220 ax-i2m1 11221 ax-1ne0 11222 ax-1rid 11223 ax-rnegex 11224 ax-rrecex 11225 ax-cnre 11226 ax-pre-lttri 11227 ax-pre-lttrn 11228 ax-pre-ltadd 11229 ax-pre-mulgt0 11230 ax-pre-sup 11231 ax-addf 11232 |
This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1540 df-fal 1550 df-ex 1777 df-nf 1781 df-sb 2063 df-mo 2538 df-eu 2567 df-clab 2713 df-cleq 2727 df-clel 2814 df-nfc 2890 df-ne 2939 df-nel 3045 df-ral 3060 df-rex 3069 df-rmo 3378 df-reu 3379 df-rab 3434 df-v 3480 df-sbc 3792 df-csb 3909 df-dif 3966 df-un 3968 df-in 3970 df-ss 3980 df-pss 3983 df-nul 4340 df-if 4532 df-pw 4607 df-sn 4632 df-pr 4634 df-tp 4636 df-op 4638 df-uni 4913 df-int 4952 df-iun 4998 df-iin 4999 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5583 df-eprel 5589 df-po 5597 df-so 5598 df-fr 5641 df-se 5642 df-we 5643 df-xp 5695 df-rel 5696 df-cnv 5697 df-co 5698 df-dm 5699 df-rn 5700 df-res 5701 df-ima 5702 df-pred 6323 df-ord 6389 df-on 6390 df-lim 6391 df-suc 6392 df-iota 6516 df-fun 6565 df-fn 6566 df-f 6567 df-f1 6568 df-fo 6569 df-f1o 6570 df-fv 6571 df-isom 6572 df-riota 7388 df-ov 7434 df-oprab 7435 df-mpo 7436 df-of 7697 df-om 7888 df-1st 8013 df-2nd 8014 df-supp 8185 df-frecs 8305 df-wrecs 8336 df-recs 8410 df-rdg 8449 df-1o 8505 df-2o 8506 df-er 8744 df-map 8867 df-pm 8868 df-ixp 8937 df-en 8985 df-dom 8986 df-sdom 8987 df-fin 8988 df-fsupp 9400 df-fi 9449 df-sup 9480 df-inf 9481 df-oi 9548 df-card 9977 df-pnf 11295 df-mnf 11296 df-xr 11297 df-ltxr 11298 df-le 11299 df-sub 11492 df-neg 11493 df-div 11919 df-nn 12265 df-2 12327 df-3 12328 df-4 12329 df-5 12330 df-6 12331 df-7 12332 df-8 12333 df-9 12334 df-n0 12525 df-z 12612 df-dec 12732 df-uz 12877 df-q 12989 df-rp 13033 df-xneg 13152 df-xadd 13153 df-xmul 13154 df-ioo 13388 df-ioc 13389 df-ico 13390 df-icc 13391 df-fz 13545 df-fzo 13692 df-fl 13829 df-mod 13907 df-seq 14040 df-exp 14100 df-fac 14310 df-bc 14339 df-hash 14367 df-shft 15103 df-cj 15135 df-re 15136 df-im 15137 df-sqrt 15271 df-abs 15272 df-limsup 15504 df-clim 15521 df-rlim 15522 df-sum 15720 df-ef 16100 df-sin 16102 df-cos 16103 df-tan 16104 df-pi 16105 df-struct 17181 df-sets 17198 df-slot 17216 df-ndx 17228 df-base 17246 df-ress 17275 df-plusg 17311 df-mulr 17312 df-starv 17313 df-sca 17314 df-vsca 17315 df-ip 17316 df-tset 17317 df-ple 17318 df-ds 17320 df-unif 17321 df-hom 17322 df-cco 17323 df-rest 17469 df-topn 17470 df-0g 17488 df-gsum 17489 df-topgen 17490 df-pt 17491 df-prds 17494 df-xrs 17549 df-qtop 17554 df-imas 17555 df-xps 17557 df-mre 17631 df-mrc 17632 df-acs 17634 df-mgm 18666 df-sgrp 18745 df-mnd 18761 df-submnd 18810 df-mulg 19099 df-cntz 19348 df-cmn 19815 df-psmet 21374 df-xmet 21375 df-met 21376 df-bl 21377 df-mopn 21378 df-fbas 21379 df-fg 21380 df-cnfld 21383 df-top 22916 df-topon 22933 df-topsp 22955 df-bases 22969 df-cld 23043 df-ntr 23044 df-cls 23045 df-nei 23122 df-lp 23160 df-perf 23161 df-cn 23251 df-cnp 23252 df-haus 23339 df-cmp 23411 df-tx 23586 df-hmeo 23779 df-fil 23870 df-fm 23962 df-flim 23963 df-flf 23964 df-xms 24346 df-ms 24347 df-tms 24348 df-cncf 24918 df-limc 25916 df-dv 25917 df-log 26613 df-cxp 26614 |
This theorem is referenced by: dvasin 37691 |
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