  The discovery in July 2020 of fully-charm tetraquark led to the need for its
theoretical explanation. For investigation of such complex four-quark
formation, the modern mathematical apparatus of the theory of derived
categories is used. By representing diquarks as solitonic objects in terms of
sheaves, one can explain the measured mass of the broad resonance of
fully-charm tetraquarks consisting of di-charmonia.
