Expressions and Equations

Expressions are distinguished from equations by the fact that equations contain an equal sign (=) and expressions do not. Equations can be solved, expressions cannot be solved. Just like expressions, equations can be assigned a name. It is important to understand that the equals sign (=) is quite different than the name assignment symbol (:=). The equal sign (=) actively participates in the mathematical formula that is entered, but the name assignment (:=) only assigns a name to the mathematical formula.

The lhs= and rhs commands are useful in manipulating equations and turning equations into expressions. The lhs= and rhs commands select one side of an equation. There are many uses of lhs= and rhs for manipulating mathematical equations and these will be presented as they arise.