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  2. Equals sign - Wikipedia

    en.wikipedia.org/wiki/Equals_sign

    A well-known equality featuring the equal sign. The equals sign ( British English) or equal sign ( American English ), also known as the equality sign, is the mathematical symbol =, which is used to indicate equality in some well-defined sense. [1] In an equation, it is placed between two expressions that have the same value, or for which one ...

  3. Logarithmic derivative - Wikipedia

    en.wikipedia.org/wiki/Logarithmic_derivative

    Calculus. In mathematics, specifically in calculus and complex analysis, the logarithmic derivative of a function f is defined by the formula. where is the derivative of f. [1] Intuitively, this is the infinitesimal relative change in f; that is, the infinitesimal absolute change in f, namely scaled by the current value of f.

  4. Nineteen Eighty-Four - Wikipedia

    en.wikipedia.org/wiki/Nineteen_Eighty-Four

    Nineteen Eighty-Four (also published as 1984) is a dystopian novel and cautionary tale by English writer George Orwell. It was published on 8 June 1949 by Secker & Warburg as Orwell's ninth and final book completed in his lifetime. Thematically, it centres on the consequences of totalitarianism, mass surveillance, and repressive regimentation ...

  5. 't - Wikipedia

    en.wikipedia.org/wiki/'t

    In the Dutch language, the word 't ( Dutch pronunciation: [ət]) is a contraction of the article "het", meaning "the". 't can be found as a tussenvoegsel, a word that is positioned between a person's first and last name. Careful writers should use an apostrophe ( U+2019 ’ RIGHT SINGLE QUOTATION MARK) in front of the t – and not confuse it ...

  6. Logrank test - Wikipedia

    en.wikipedia.org/wiki/Logrank_test

    Logrank test. The logrank test, or log-rank test, is a hypothesis test to compare the survival distributions of two samples. It is a nonparametric test and appropriate to use when the data are right skewed and censored (technically, the censoring must be non-informative). It is widely used in clinical trials to establish the efficacy of a new ...

  7. Yule log - Wikipedia

    en.wikipedia.org/wiki/Yule_log

    The Yule log, Yule clog, or Christmas block is a specially selected log burnt on a hearth as a winter tradition in regions of Europe, and subsequently North America. The origin of the folk custom is unclear. Like other traditions associated with Yule (such as the Yule boar ), the custom may ultimately derive from Proto-Indo-European religion as ...

  8. Log amplifier - Wikipedia

    en.wikipedia.org/wiki/Log_amplifier

    The log amplifier gives an output voltage which is proportional to the logarithm of the applied input voltage. To design a log amplifier circuit, high performance op-amps like LM1458, LM771, LM714 are commonly used and a compensated log amplifier may include more than one. In some situations, especially in RF domain, monolithic log amplifiers ...

  9. Logarithmic integral function - Wikipedia

    en.wikipedia.org/wiki/Logarithmic_integral_function

    Logarithmic integral function. In mathematics, the logarithmic integral function or integral logarithm li ( x) is a special function. It is relevant in problems of physics and has number theoretic significance. In particular, according to the prime number theorem, it is a very good approximation to the prime-counting function, which is defined ...