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<cfTitle cfLangCode='EN' cfTrans='o'>Cubic systems with seven invariant straight lines of configuration (3, 3, 1)</cfTitle>
<cfKeyw cfLangCode='EN' cfTrans='o'>Cubic differential system; invariant straight line; phase
portrait.</cfKeyw>
<cfAbstr cfLangCode='EN' cfTrans='o'>We classify all cubic differential systems with exactly seven invariant straight lines (taking into account their parallel multiplicity) which form a configuration of type (3, 3, 1). We prove that there are six different topological classes of such systems. For every class we carried out the qualitative investigation on the Poincar´e disc. Some properties of cubic systems with invariant straight lines are given.</cfAbstr>
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