Oregon Department of Human Services / Seniors & People with Disabilities / Intellectual and Developmental Disabilities.
Note [Deprecated. The linear element defines the value of a param element at a particular time, relative to the start of the transition or effect that contains the param element. The linear element causes the parameter to make a smooth transition from its previous value to the new value. For an instantaneous jump to a new value, use the at element. Attributes.
A linear system with a unique solution has a solution set with one element. A linear system with no solution has a solution set that is empty. In these cases the solution set is easy to describe. Solution sets are a challenge to describe only when they contain many elements.