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  2. Fourier series - Wikipedia

    en.wikipedia.org/wiki/Fourier_series

    A Fourier series (/ ˈ f ʊr i eɪ,-i ər / [1]) is an expansion of a periodic function into a sum of trigonometric functions. The Fourier series is an example of a trigonometric series. [2] By expressing a function as a sum of sines and cosines, many problems involving the function become easier to analyze because trigonometric functions are ...

  3. Initial algebra - Wikipedia

    en.wikipedia.org/wiki/Initial_algebra

    Consider the endofunctor 1 + (−), i.e. F : Set → Set sending X to 1 + X, where 1 is a one-point set, a terminal object in the category. An algebra for this endofunctor is a set X (called the carrier of the algebra) together with a function f : (1 + X) → X. Defining such a function amounts to defining a point x ∈ X and a function X → X

  4. Multiple choice - Wikipedia

    en.wikipedia.org/wiki/Multiple_choice

    Multiple choice questions lend themselves to the development of objective assessment items, but without author training, questions can be subjective in nature. Because this style of test does not require a teacher to interpret answers, test-takers are graded purely on their selections, creating a lower likelihood of teacher bias in the results. [8]

  5. Algebraic structure - Wikipedia

    en.wikipedia.org/wiki/Algebraic_structure

    These equations induce equivalence classes on the free algebra; the quotient algebra then has the algebraic structure of a group. Some structures do not form varieties, because either: It is necessary that 0 ≠ 1, 0 being the additive identity element and 1 being a multiplicative identity element, but this is a nonidentity;

  6. Frobenius theorem (real division algebras) - Wikipedia

    en.wikipedia.org/wiki/Frobenius_theorem_(real...

    Assume that k > 2. Define u = e 1 e 2 e k and consider u 2 =(e 1 e 2 e k)*(e 1 e 2 e k). By rearranging the elements of this expression and applying the orthonormality relations among the basis elements we find that u 2 = 1. If D were a division algebra, 0 = u 21 = (u − 1)(u + 1) implies u = ±1, which in turn means: e k = ∓e 1 e 2 and ...

  7. Ratio test - Wikipedia

    en.wikipedia.org/wiki/Ratio_test

    In this example, the ratio of adjacent terms in the blue sequence converges to L=1/2. We choose r = (L+1)/2 = 3/4. Then the blue sequence is dominated by the red sequence r k for all n ≥ 2. The red sequence converges, so the blue sequence does as well. Below is a proof of the validity of the generalized ratio test.