H₀

H₀

1. (statistics) null hypothesis
   • 2008, Giuseppe Cicchitelli, Statistica. Principi e metodi (in Italian), Pearson, →ISBN, →OCLC, page 445:

     Si voglia, ora, verificare l’ipotesi nulla H₀ : μ = μ₀ contro l’alternativa H₁ : μ < μ₀.

     Let us now test the null hypothesis H₀ : μ = μ₀ against the alternative H₁ : μ < μ₀.

   • 2018 August 1, Shen Bicheng (沈必成), Zuo Qiang (左强), 预防医学 [Preventative Medicine]‎ (in Chinese), Beijing Book Co. Inc., →ISBN, →OCLC:

     I型错误又称第I类错误，指拒绝了实际上成立的H₀，为“弃真”的错误，发生概率为α(即检验水准)。

     Type I error, also known as Class I error, is an error that rejects H₀, which actually holds, and is "discarded while true" with a probability of α (i.e., the significance level).

2. (cosmology) Hubble constant
   • 2019 July 17, Eunil Won (원은일), 우주 탄생의 비밀을 찾아서 [In search of the secret of the birth of the universe] (in Korean), 세창출판사, →ISBN, pages 35–36:

     허블 상 수라고 부르는 이 기울기 H₀는 허블을 기념하기 위한 것이고 아래 첨자 0은 오늘날의 값을 의미합니다.

     Heobeul sang surago bureuneun i giulgi H ₀neun heobeureul ginyeomhagi wihan geosigo arae cheomja 0eun oneullarui gapseul uimihamnida.

     This slope H₀ is called the Hubble constant in honor of Hubble, and the subscript 0 stands for the present value.

   • 2021 July 21, Gravitationswellen: Start in eine neue Astronomie (Spektrum Kompakt)‎ (in German), Spektrum der Wissenschaft, →ISBN, page 27:

     Leider lieferten bislang verschiedene Messmethoden für H₀ voneinander abweichende Ergebnisse, was ein großes Rätsel der modernen Kosmologie ist.

     Unfortunately, different measurement methods for H₀ have so far given divergent results, which is a great mystery of modern cosmology.

3. (chemistry) Hammett acidity function
   • 2007, Georgia K. Kyriakou (Γεωργία Κ. Κυριάκου), Σύνθεση μεσοπορώδους οξειδίου του δημητρίου με ελεγχόμενη κατανομή μεγέθους των πόρων [Mesoporous cerium oxide synthesis with controlled pore size distribution]‎ (thesis; in Greek), University of Cyprus, page 45:

     Το H₀ όρίζεται σαν η ικανότητα του οξέως να δίνει ένα πρωτόνιο στον βασικό δείκτη

     To H₀ órízetai san i ikanótita tou oxéos na dínei éna protónio ston vasikó deíkti

     H₀ is defined as the ability of an acid to give a proton to the base index

   • 2011, Jean-Louis Brisset, editor, Chimie analytique en solution, 2nd edition (in French), Lavoisier, →ISBN, →OCLC, page 74:

     H₀ mesure la tendance de la solution à transférer un proton vers une base moléculaire B.

     H₀ measures the tendency of the solution to transfer a proton to a molecular base B.