I would like to express an idea in an expression equivalence (t equiv a) knowing that when (t = 1) the value of "a" must be "0" and when (t = 1) the value of A is any value. I expressed this as follows: (a = 1-t) it works well when (t = 1) but when (t = 0) it requires "a" has to be equal to 1.
if someone has an idea, thank you.