Geodesic
Implications of a~system of linear equations over a~module
Diskretnaya Matematika, Tome 19 (2007) no. 1, pp. 133-140.

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We describe the class $L(R)$ of all left modules over a ring $R$ such that for any matrix $D$ over $R$ and any solvable system of equations $$ F\eta^\downarrow=\gamma^\downarrow $$ over a module from $L(R)$ the system of equations $$ A\xi^\downarrow=\beta^\downarrow $$ is its $D$-implication if and only if $$ T(F,\gamma^\downarrow)=(AD,\beta^\downarrow) $$ for some matrix $T$. If $R$ is a quasi-Frobenius ring, then $L(R)$ contains the subclass of all faithful $R$-modules. A criterion for a system of equations over a module from $L(R)$ to be definite is obtained. 
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V. P. Elizarov. Implications of a~system of linear equations over a~module. Diskretnaya Matematika, Tome 19 (2007) no. 1, pp. 133-140. http://geodesic.mathdoc.fr/item/DM_2007_19_1_a13/

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