small resolutions of Calabi–Yau threefolds and determined them on the resolved conifold.
Their invariants recover DT/PT invariants and Szendröi's non-commutative invariants in
some chambers of stability conditions. In this paper, we study an analogue of their work on
Calabi–Yau fourfolds. We define counting invariants for stable perverse coherent systems
using primary insertions and compute them in all chambers of stability conditions. We also …