5.3. Continuous-time framework

We now adopt a continuous-time framework where \(\Phi(x,y,t|(1,0))\) is the PGF for \(X(t),Y(t)\) assuming \((X(0),Y(0))=(1,0)\).

I have not written this section, but you can follow the work done in Development of cancer (Carcinogenesis) Section 5.5.