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An unknown is a variable in an equation which has to be solved for. An indeterminate is a symbol, commonly called variable, that appears in a polynomial or a formal power series. Formally speaking, an indeterminate is not a variable, but a constant in the polynomial ring or the ring of formal power series.
In mathematics, a function is a rule for taking an input (in the simplest case, a number or set of numbers) [5] and providing an output (which may also be a number). [5] A symbol that stands for an arbitrary input is called an independent variable, while a symbol that stands for an arbitrary output is called a dependent variable. [6]
If is a vector-valued random variable, with values in , and thought of as a column vector, then a natural generalization of variance is [() ()], where = and is the transpose of , and so is a row vector.
Variation (music), a formal technique where material is altered during repetition Variations, a series of works by American avant-garde composer John Cage; Variations, 1982 Australian musical by Nick Enright and Terence Clarke
In an economic model, an exogenous variable is one whose measure is determined outside the model and is imposed on the model, and an exogenous change is a change in an exogenous variable. [1]: p. 8 [2]: p. 202 [3]: p. 8 In contrast, an endogenous variable is a variable whose measure is determined by the model. An endogenous change is a change ...
Learning to bring oneself down from grandiose states of mind, or up from exaggerated shame states, is part of taking a proactive approach to managing one's own moods and varying sense of self-esteem. [179] Behavioral activation is a component of CBT that can break the cycle (depression leads to inactivity, inactivity leads to depression). [180]
BLISTERS MIGHT NOT seem like a big deal—until you get one and remember how debilitating they can be. These painful skin lesions are caused by friction when your skin rubs against your shoes ...
An analog signal is any continuous signal for which the time-varying feature of the signal is a representation of some other time varying quantity, i.e., analogous to another time varying signal. For example, in an analog audio signal , the instantaneous voltage of the signal varies continuously with the sound pressure .