1. The problem statement, all variables and given/known data I need this to answer a question, its not a homework question itself. Can this be simplified? u(t-2)u(t-a) where u is the unit step function. 2. Relevant equations - 3. The attempt at a solution I know the answer is u(t-2) if a <= 2, u(t-a) otherwise. But is there a better way to express this?