Some properties of subalgebras in varieties of linear $\Omega$-albebras

The paper studies connections between the Nielsen and Schreier properties in varieties of linear $\Omega$-algebras, and also between systems $S$ of identical relations such that the theorem about subalgebras lying in the variety $\mathfrak M_S$ is valid, or such that the theorem about finitely generated subalgebras analogous to that of Zhukov is valid.
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