# first-order

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**First-order**— First or der, a. decaying at an exponential rate; a mathematical concept applied to various types of decay, such as radioactivity and chemical reactions. Note: In first order decay, the amount of material decaying in a given period of time is… … The Collaborative International Dictionary of English**first-order**— adjective 1》 most fundamental; primary. 2》 denoting mathematical equations involving only the first power of the independent variable or only the first derivative of a function … English new terms dictionary**first-order**— … Useful english dictionary**First-order logic**— is a formal logical system used in mathematics, philosophy, linguistics, and computer science. It goes by many names, including: first order predicate calculus, the lower predicate calculus, quantification theory, and predicate logic (a less… … Wikipedia**first order of business**— UK US noun [C] (plural first orders of business) ► a situation or subject that must be dealt with before anything else: »When the financial situation gets difficult, the first order of business is to define your goals and your priorities … Financial and business terms**first-order languages**— first order language … Philosophy dictionary**First-order hold**— The first order hold (FOH) is a mathematical model of the practical reconstruction of sampled signals that could be done by a conventional digital to analog converter (DAC) and an analog circuit called an integrator. For the FOH, the signal is… … Wikipedia**First-order control**— In control theory, first order control is when a desired result is attempted by adjusting a scalar (first order) control. Such mechanisms, where first order change successfully produces desired results, are called first order mechanisms . First… … Wikipedia**First-order reduction**— A first order reduction is a very weak type of reduction between two computational problems in computational complexity theory. A first order reduction is a reduction where each component is restricted to be in the class FO of problems calculable … Wikipedia**First order partial differential equation**— In mathematics, a first order partial differential equation is a partial differential equation that involves only first derivatives of the unknown function of n variables. The equation takes the form: F(x 1,ldots,x n,u,u {x 1},ldots u {x n}) =0 … Wikipedia