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  2. Debt-to-equity ratio - Wikipedia

    en.wikipedia.org/wiki/Debt-to-equity_ratio

    A company's debt-to-equity ratio (D/E) is a financial ratio indicating the relative proportion of shareholders' equity and debt used to finance the company's assets. [1] Closely related to leveraging , the ratio is also known as risk , gearing or leverage .

  3. Ordinary differential equation - Wikipedia

    en.wikipedia.org/wiki/Ordinary_differential_equation

    In mathematics, an ordinary differential equation (ODE) is a differential equation (DE) dependent on only a single independent variable.As with other DE, its unknown(s) consists of one (or more) function(s) and involves the derivatives of those functions. [1]

  4. Differential equation - Wikipedia

    en.wikipedia.org/wiki/Differential_equation

    In mathematics, a differential equation is an equation that relates one or more unknown functions and their derivatives. [1] In applications, the functions generally represent physical quantities, the derivatives represent their rates of change, and the differential equation defines a relationship between the two.

  5. De Moivre's formula - Wikipedia

    en.wikipedia.org/wiki/De_Moivre's_formula

    De Moivre's formula is a precursor to Euler's formula = ⁡ + ⁡, with x expressed in radians rather than degrees, which establishes the fundamental relationship between the trigonometric functions and the complex exponential function.

  6. Linear differential equation - Wikipedia

    en.wikipedia.org/wiki/Linear_differential_equation

    The study of these differential equations with constant coefficients dates back to Leonhard Euler, who introduced the exponential function e x, which is the unique solution of the equation f′ = f such that f(0) = 1. It follows that the n th derivative of e cx is c n e cx, and this allows solving homogeneous linear differential equations ...

  7. De Brouckere mean diameter - Wikipedia

    en.wikipedia.org/wiki/De_Brouckere_mean_diameter

    Example showing the difference between D 50 and the De Brouckere Mean on a typical volume-weighted particle size distribution. The De Brouckere mean diameter is the mean of a particle size distribution weighted by the volume (also called volume-weighted mean diameter, volume moment mean diameter. [1] or volume-weighted mean size [2]). It is the ...

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    search.aol.com

    The search engine that helps you find exactly what you're looking for. Find the most relevant information, video, images, and answers from all across the Web.

  9. Duhamel's principle - Wikipedia

    en.wikipedia.org/wiki/Duhamel's_principle

    In mathematics, and more specifically in partial differential equations, Duhamel's principle is a general method for obtaining solutions to inhomogeneous linear evolution equations like the heat equation, wave equation, and vibrating plate equation.