SGR-R possesses a canonical set of free generators via shifted twists, endowing it with a Grothendieck structure and enough injectives and projectives, plus a semi-graded Baer's criterion analogue.
Generalized Rigid Modules and Their Polynomial Extensions
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On the category of semi-graded modules
SGR-R possesses a canonical set of free generators via shifted twists, endowing it with a Grothendieck structure and enough injectives and projectives, plus a semi-graded Baer's criterion analogue.