Signal analysis using a buffer I am performing an analysis of an output signal in the interval $t&lt;0$ from the operational amplifier given in the following image

where $v_{C_1}(0^-)$ and $v_{C_2}(0^-)$ are the initial conditions to be computed of two capacitors. As you can see, the solution is just below the image.

What I can't understand is why all the measured voltages are $1V$ without knowing the values of the resistances and just knowing that $V_-=V_+$. For sure I am missing something that I don't know. Can someone give me a hint? Thank you.
You should know charaterstics of an opamp it has infinite input resistance and zero output resistance hence opamp doesn't draw any current in the input side hence it is an open circuit and current through is zero apply kvl(Kirchoff voltage law) you will know