Key Equations:
To simplify we can take out capital for the production functions of output and ideas respectively:
\(Y_t = [(1 - a_L)A_tL_t]^{1 - \alpha}\)
\(\dot A_t = B[a_L L_t]^\gamma A_t ^\theta\)
Equilibrium steady state requires that the rate of growth of the rate of growth of A is zero, thus
\(g_A = \frac{\gamma}{1 - \theta} n\)