# Article

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Keywords:
quasi-corational module; copolyform module; $\alpha$-coatomic module
Summary:
The aim of this paper is to investigate quasi-corational, comonoform, copolyform and $\alpha$-(co)atomic modules. It is proved that for an ordinal $\alpha$ a right $R$-module $M$ is $\alpha$-atomic if and only if it is $\alpha$-coatomic. And it is also shown that an $\alpha$-atomic module $M$ is quasi-projective if and only if $M$ is quasi-corationally complete. Some other results are developed.
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