2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/153512The non-commutative algebraic analog of the moduli of vector and covector fields is built. The structure of moduli of derivations of non-commutative algebras are studied. The canonical coupling is introduced and the conditions for appropriate moduli to be reflexive are obtained.11 pages, LaTex, available by e-mail <zzz@russ-museum.spb.su>Quantum Algebratext