FORMULA

FORMULA, a theorem or general rule or expression, for resolving certain particular cases of some problem, &c. So $\backslash frac\{1\}\{2\}s\; +\; \backslash frac\{1\}\{2\}d$ is a general formula for the greater of two quantities whose sum is $s$ and difference $d$; and $\backslash frac\{1\}\{2\}s\; -\; \backslash frac\{1\}\{2\}d$ is the formula, or general value, for the

the less quantity. Also $\backslash sqrt\{dx\; -\; x^2\}$ is the formula, or general value, of the ordinate to a circle, whose diameter is $d$, and abscissa $x$.