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  2. Liouville's theorem (differential algebra) - Wikipedia

    en.wikipedia.org/wiki/Liouville's_theorem...

    Its antiderivatives ⁡ + do not seem to satisfy the requirements of the theorem, since they are not (apparently) sums of rational functions and logarithms of rational functions. However, a calculation with Euler's formula e i θ = cos ⁡ θ + i sin ⁡ θ {\displaystyle e^{i\theta }=\cos \theta +i\sin \theta } shows that in fact the ...

  3. History of the function concept - Wikipedia

    en.wikipedia.org/wiki/History_of_the_function...

    – Any algebraic expression involving symbol x is termed a function of x, and may be represented by the abbreviated form f(x)" [41] Boole then used algebraic expressions to define both algebraic and logical notions, e.g., 1 − x is logical NOT( x ), xy is the logical AND( x , y ), x + y is the logical OR( x , y ), x ( x + y ) is xx + xy , and ...

  4. Derivative - Wikipedia

    en.wikipedia.org/wiki/Derivative

    In mathematics, the derivative is a fundamental tool that quantifies the sensitivity to change of a function's output with respect to its input. The derivative of a function of a single variable at a chosen input value, when it exists, is the slope of the tangent line to the graph of the function at that point.

  5. Function of several real variables - Wikipedia

    en.wikipedia.org/wiki/Function_of_several_real...

    For real-valued functions of a real variable, y = f(x), its ordinary derivative dy/dx is geometrically the gradient of the tangent line to the curve y = f(x) at all points in the domain. Partial derivatives extend this idea to tangent hyperplanes to a curve. The second order partial derivatives can be calculated for every pair of variables:

  6. Algebraic expression - Wikipedia

    en.wikipedia.org/wiki/Algebraic_expression

    An algebraic equation is an equation involving polynomials, for which algebraic expressions may be solutions. If you restrict your set of constants to be numbers, any algebraic expression can be called an arithmetic expression. However, algebraic expressions can be used on more abstract objects such as in Abstract algebra.

  7. Fractional calculus - Wikipedia

    en.wikipedia.org/wiki/Fractional_calculus

    In applied mathematics and mathematical analysis, a fractional derivative is a derivative of any arbitrary order, real or complex. Its first appearance is in a letter written to Guillaume de l'Hôpital by Gottfried Wilhelm Leibniz in 1695. [2] Around the same time, Leibniz wrote to one of the Bernoulli brothers describing the similarity between ...

  8. Derivation (differential algebra) - Wikipedia

    en.wikipedia.org/wiki/Derivation_(differential...

    The partial derivative with respect to a variable is an R-derivation on the algebra of real-valued differentiable functions on R n. The Lie derivative with respect to a vector field is an R-derivation on the algebra of differentiable functions on a differentiable manifold; more generally it is a derivation on the tensor algebra of a manifold

  9. Elliptic function - Wikipedia

    en.wikipedia.org/wiki/Elliptic_function

    One of the main results of the theory of elliptic functions is the following: Every elliptic function with respect to a given period lattice can be expressed as a rational function in terms of ℘ and ℘ ′. [7] The ℘-function satisfies the differential equation

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