I'm reading a journal article that implies the following but I can't see how it is done. I'll give 100 DogeCoin (or equivalent) to whomever can explain this in full.
Given that
V(A|B) = s
V(A) = r*s + w
B = A + C
and A & C are independent
so V(B) = V(A) + V(C) & V(C) = V(B) - V(A)
Then how...