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In this paper, we characterize the stability region for trinomials of theform $f(\zeta):=a\zeta ^n + b\zeta ^m +c$, $\zeta\in \mathbb{C}$, where $a$,$b$ and $c$ are non-zero complex numbers and $n,m\in \mathbb{N}$ with $n>m$.More precisely, we provide necessary and sufficient conditions on thecoefficients $a$, $b$ and $c$ in order that all the roots of the trinomial $f$belongs to the open unit disc in the complex plane. The proof is based onBohl's Theorem introduced in 1908.

The stability region for Schur stable trinomials with general complex coefficients