1. The problem statement, all variables and given/known data There's a circuit, with a capacitor C1, Resistor R1, and another capacitor C2. In t=0 ; C1 is charged with 2 V and C2 with 1 V The value of resistor is 1 ohm, C1= 1 F C2=0.5 F 2. Relevant equations Kirchoff voltage law. Capacitor voltage at any given time. (integral form) 3. The attempt at a solution I solve the resulting diferential equation, but don't know constant value. I believed that it was -3 One of the things that the problem request if to find a expresion for v1(t), v2(t). I substituted i(t) (diferential equation solution) in the integral form of capacitor voltage formula, well that was easy, but another incise in the problem is to prove that v1(inf)=v2(inf), with the constants from the last integration it is impossible.