Part C: Linearity
My definition of linearity in terms of systems is:
A system whose output combined with a linear shift is equivalent to the output if the linear shift is on the input of the system.
An example of a linear system is:
$ x(t) = t + 3 $
To prove this:
$ Y_1(t) = A*x(t) = Z_1(t) $
$ Y_2(t) = X(At) = Z_2(t) $
$ Z_1(t) = Z_2(t) $
for any number A
Non-linear
$ x(t) = t^2 $
Is an example of a non linear system. The order of linear operations before and after the system affect the result of the cascade
for t = 2 and A = 2 $ Y_1(2) = 2*x(2) = 8 $
$ Y_2(2) = x(2*2) = 16 $
$ Z_1(t) \neq Z_2(t) $
