Multiple Erlang fixed points under alternative routing
= Multiple Erlang fixed points under alternative routing
A symmetric triangle with direct calls and two-link overflow routes has <Erlang fixed point approximation> equation $B=E(\lambda[1+2B(1-B)],C)$. For $C=1000$ and $\lambda=950$, this has at least three solutions, certified by the <intermediate value theorem> using signs at $B=0,0.01,0.1,0.4$.