2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Hauv kev ua lej, Wronskian (lossis Wrońskian) yog tus txiav txim siab qhia los ntawm Józef Hoene-Wroński (1812) thiab npe los ntawm Thomas Muir (1882, Tshooj XVIII). Nws yog siv hauv kev kawm ntawm qhov sib npaug sib txawv, qhov twg nws tuaj yeem ua rau qee zaum qhia kev ywj pheej hauv cov txheej txheem daws teeb meem.
Yuav ua li cas yog Wronskian muaj nuj nqi?
if rau kev ua haujlwm f thiab g, Wronskian W(f, g)(x0) yog nonzero rau qee x0 hauv [a, b] ces f thiab g yog linearly ywj siab ntawm [a, b]. Yog tias f thiab g yog linearly dependent ces Wronskian yog xoom rau tag nrho x0 hauv [a, b].
txhais li cas yog Wronskian tsis yog xoom?
Qhov tseeb tias Wronskian tsis yog xoom ntawm x0 txhais tau tias tias lub square matrix ntawm sab laug tsis yog lus, li no. qhov kev sib npaug no tsuas muaj qhov kev daws teeb meem c1=c2=0, yog li f thiab g yog ywj siab.
Wronskian xam li cas?
Tus Wronskian yog muab los ntawm qhov kev txiav txim hauv qab no: W(f1, f2, f3)(x)(x)=|f1(x)f2(x)f3(x)f′1(x) f′2(x)f′3(x)f′1(x)f′′2(x)f′′3(x)|.
Tus nqi ntawm Wronskian yog dab tsi?
Yog li txij li Wronskian yog sib npaug rau xoom, qhov no txhais tau tias cov txheej txheem kev daws teeb meem no peb hu ua f (x) f (x) f (x) thiab g (x) g(x) g(x) tsis tsim ib qho kev daws teeb meem.
Pom zoo:
Cov khoom siv dab tsi yog siv rau phab ntsa screeding?
Plaster of Paris yog ib qho zoo tshaj plaws thiab feem ntau siv cov khoom siv screeding uas muab koj cov phab ntsa zoo tag thiab du. POP mix yuav tsum muaj ob qho khoom xyaw nrog rau cov hmoov gypsum tseem hu ua POP cement thiab tshwj xeeb POP Screeding Paint.
Puas yog cov dab dab dab dab dab dab dab dab dab dab dab dab?
Myth: Ib tug dab tshos tsis yog neeg ncaj ncees yog tiasnws haum yog. Fact: Tu siab, qhov no yog ib lo lus tsis tseeb uas tau raug perpetuated los ntawm aversive trainers. Txawm hais tias haum rau lub caj dab kom zoo khawb rau hauv cov tawv nqaij rhiab nyob ib ncig ntawm lub caj dab, uas ua rau muaj kev puas tsuaj loj rau cov thyroid, esophagus, thiab trachea.
Yuav ua li cas txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau pom kev pom?
Txawm li cas los xij, corneal collagen cross-linking - cov txheej txheem qib siab tau pom zoo los ntawm US Food and Drug Administration (FDA) hauv xyoo 2016 - tuaj yeem txhim kho qhov pom kev hauv cov neeg mob txhua hnub nyoog. Corneal collagen cross-linking (CXL) tsis yog kho rau keratoconus, tab sis nws tuaj yeem pab tiv thaiv tus mob kom tsis txhob mob hnyav.
Yuav siv dab tsi txhawm rau txhawm rau txhawm rau txhawm?
Siv phom caulk siv cov hlaws tuab ntawm caulk ncig ntawm ntug ntawm lub txee. Tsa lub dab dej kom nws nias tawm tsam lub hauv qab ntawm lub countertop thiab tsim cov dej tsis sib haum. Ntxiv cov laug cam thiab shims raws li xav tau los xyuas kom meej lub dab dej nyob hauv qhov chaw.
Puas yog cov dab dab dab dab dab dab tau them?
OHL cov neeg ua si tsis tau nyiaj hli, vim lawv tsis raug lees paub tias yog cov neeg ua haujlwm raws li Txoj Cai Kev Ua Haujlwm. Txawm li cas los xij, lawv suav nrog cov txiaj ntsig xws li nyiaj rov qab txhua xyoo, tag nrho cov nqi kawm ntawv them, thiab daim pib pub dawb.
