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  2. Identity (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Identity_(mathematics)

    Visual proof of the Pythagorean identity: for any angle , the point (,) = (⁡, ⁡) lies on the unit circle, which satisfies the equation + =.Thus, ⁡ + ⁡ =. In mathematics, an identity is an equality relating one mathematical expression A to another mathematical expression B, such that A and B (which might contain some variables) produce the same value for all values of the variables ...

  3. Triple bar - Wikipedia

    en.wikipedia.org/wiki/Triple_bar

    The closely related code point U+2262 ≢ NOT IDENTICAL TO (≢, ≢) is the same symbol with a slash through it, indicating the negation of its mathematical meaning. [ 1 ] In LaTeX mathematical formulas, the code \equiv produces the triple bar symbol and \not\equiv produces the negated triple bar symbol ≢ {\displaystyle \not ...

  4. List of mathematical identities - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical...

    This article lists mathematical identities, that is, identically true relations holding in mathematics. Bézout's identity (despite its usual name, it is not, properly speaking, an identity) Binet-cauchy identity; Binomial inverse theorem; Binomial identity; Brahmagupta–Fibonacci two-square identity; Candido's identity; Cassini and Catalan ...

  5. Equals sign - Wikipedia

    en.wikipedia.org/wiki/Equals_sign

    The first use of an equals sign, equivalent to 14x+15=71 in modern notation.From The Whetstone of Witte (1557) by Robert Recorde. Recorde's introduction of "=" Before the 16th century, there was no common symbol for equality, and equality was usually expressed with a word, such as aequales, aequantur, esgale, faciunt, ghelijck, or gleich, and sometimes by the abbreviated form aeq, or simply æ ...

  6. Angel number 222 meaning: Why seeing this number is a ... - AOL

    www.aol.com/news/angel-number-222-meaning-why...

    Seeing 222 is likely sending a message to focus your attention on your heart connections, meaning friendships, romantic relationships and family ties, according to Wilder.

  7. Mutual information - Wikipedia

    en.wikipedia.org/wiki/Mutual_information

    The joint information is equal to the mutual information plus the sum of all the marginal information (negative of the marginal entropies) for each particle coordinate. Boltzmann's assumption amounts to ignoring the mutual information in the calculation of entropy, which yields the thermodynamic entropy (divided by the Boltzmann constant).

  8. Symmetry of second derivatives - Wikipedia

    en.wikipedia.org/wiki/Symmetry_of_second_derivatives

    Finally in 1867 Lindelöf systematically analyzed all the earlier flawed proofs and was able to exhibit a specific counterexample where mixed derivatives failed to be equal. [6] [7] Six years after that, Schwarz succeeded in giving the first rigorous proof. [8] Dini later contributed by finding more general conditions than those of Schwarz.

  9. Equal consideration of interests - Wikipedia

    en.wikipedia.org/wiki/Equal_consideration_of...

    The term "equal consideration of interests" first appeared in Australian moral philosopher Peter Singer's 1975 book Animal Liberation. [2] Singer asserts that if all beings, not just humans, are included as having interests that must be considered, then the principle of equal consideration of interests opposes not only racism and sexism , but ...