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 On a first order strong differential subordination and application to univalent functions Commun. Korean Math. Soc.Published online August 2, 2021 Rasoul Aghalary and Parviz Arjomandinia Dept. of Math. Urmia Univ.; Dept. of Education Abstract : Using the concept of strong differential subordination, introduced in \cite{4.a}, we find conditions on the functions $\theta, \varphi, G, F$ such that the first order strong subordination $$\theta(p(z))+\frac{G(\xi)}{\xi} zp'(z)\varphi(p(z))\prec \prec \theta(q(z))+F(z)q'(z)\varphi(q(z),$$ implies $$p(z)\prec q(z),$$ where $p(z), q(z)$ are analytic functions in the open unit disk $\mathbb{D}$ with $p(0)=q(0)$. Corollaries and examples of the main results are also considered, which some of them extend and improve the results obtained in \cite{1.a}. Keywords : convex, close-to-convex function, starlike function, strong differential subordination MSC numbers : Primary 30C45; Secondary 30C80 Full-Text :