%0 Journal Article %T On a Classification of Almost $\alpha $-Cosymplectic Manifolds %J Khayyam Journal of Mathematics %I Department of Pure Mathematics, Ferdowsi University of Mashhad (in cooperation with the Center of Excellence in Analysis on Algebraic Structures) %Z 2423-4788 %A Erken, İrem Küpeli %D 2019 %\ 01/01/2019 %V 5 %N 1 %P 1-10 %! On a Classification of Almost $\alpha $-Cosymplectic Manifolds %K Almost α-Cosymplectic manifold %K projectively flat %K conformally flat %K concircularly flat %R 10.22034/kjm.2018.67030 %X The object of the present paper is to study almost $\alpha $-cosymplectic manifolds. We consider projectively flat, conformally flat, and concircularly flat almost $\alpha $-cosymplectic manifolds (with the $\eta $-parallel tensor field $\phi h$) and get some new properties. We conclude the paper by giving an example of $\alpha $-Kenmotsu manifold, which verifies our results. %U https://www.kjm-math.org/article_67030_b36cd9107ed71f514da1f1c232d7e881.pdf