There is one thing there is bothering me about stepfunction...
I know a stepfunction only can have the value of 0 and 1 (without anything multiplied)..
and I can choose whenever i want it to go high or low depending on the value of C..
but what if i choose C = 5..
what will happen at U5(3-5) = U5(-2)??
I know i will stay at 0, but why 0, can't you take a unit stepfunction to a negative number?..
And if not.. why do we use the shiftning theorem when using stepfunction on ordinary function.. isn't to "remove" the negative area..