= Existence conditions for exponential-potential scaling
{title2=$V_0(6-\lambda^2)>0$}
For $V_0\ne0$, real nonzero $\lambda$, and a finite positive logarithmic time scale $t_0$, the <exponential-potential scalar-dominated power-law solution> requires the displayed strict sign condition. Thus positive $V_0$ permits $0<\lambda^2<6$, while negative $V_0$ permits $\lambda^2>6$. The boundary $\lambda^2=6$ cannot occur with nonzero $V_0$ in this ansatz. Setting $\lambda=0$ gives a constant potential and a separate branch, including constant-field <de Sitter spacetime> for $V_0>0$.
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