Coefficients and terms

Later in this manual, it will be helpful to distinguish between formulae written as coefficients and those written as terms.

If X is a variable, then in the formula X*f(Y), f(Y) is the coefficient of X.

If f(X) appears in a nonlinear constraint, then f(X) is a term in the nonlinear constraint.

If X*f(Y) appears in a nonlinear constraint, then the entity X*f(Y) is a term in the nonlinear constraint.

As this implies, a formula written as a variable multiplied by a coefficient can always be viewed as a term, but there are terms which cannot be viewed as variables multiplied by coefficients. For example, in the constraint
X - SIN(Y) = 0,
SIN(Y) is a term and cannot be written as a coefficient.