Nonexistence of solutions in $(0,1)$ for K-P-P-type equations for all $d\ge 1$

J. Englander, P. L. Simon

Consider the KPP-type equation of the form $\Delta u+f(u)=0$, where $f:[0,1]\to {\mathbb{R}}_{+}$ is a concave function. We prove for arbitrary dimensions that there is no solution bounded…