but in control engineering we r always using frequency domain in block reduction and concatenation
they say that it is more easy since it transforms differential and integral equations into algebric equation and because it makes block concatenation extremely easy
but are those the only reasons??????
i hate getting used to something without understanding it very well
another way of writing the integro-differential operator that the block
represenrs, and also by a simple change of variable converts to the
But all this assumes that we have linear operators.