Non-commutative Fano varieties and three-dimensional minifolds

Source abstract

We introduce notions of non-commutative Fano varieties and non-commutative minifolds, and study the latter in dimension three. We prove that the Euler matrices of full exceptional collections generating geometric helices on these minifolds form five mutation classes, distinguished by their Euler degrees $22,40,54,64,72.$ The first four classes are realized by (commutative) Fano threefolds $X_{22},V_5,Q^3,\mathbb P^3,$ respectively. The fifth is realized by the non-commutative family $M_{72}$ and cannot be realized by a full exceptional collection on a smooth projective threefold.