In algenbra, an equation is a proposition asserting the equality of two quantities, and expressed by the equals sign (=) between them; or an expression of the same quantity in two dissimilar terms, but of equal value as $1 = 100c or x = b + m - r. In the latter case x is equal to b added to m, with r subtracted, and the quantities on the right hand of the sign of equation are said to be the value of x on the left hand. An equation is termed simple, quadratic., cubic, or biquadratic, or of the first, second, third, or fourth degree, according as the index of the highest power of the unknown quantity is one, two, three, or four.
In astronomy, an equation is the correction or quantity to be added to or subtracted from the mean position of a heavenly body to obtain the true position. The term personal equation is the quantity of time by which a person is in the habit of noting a phenomenon wrongly; it may be called positive or negative, according as he notes it after or before it really takes place. Research Equation
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Abbreviations
SciTech
Research Equation
