18 citations · 19 across the 4 of their papers we have counts for
4 papers
Computing invariants via slicing groupoids: Gel'fand MacPherson, Gale and positive characteristic stable maps
Jarod Alper
We offer a groupoid-theoretic approach to computing invariants. We illustrate this approach by describing the Gel'fand-MacPherson correspondence and the Gale transform as well as g…
Invariant rings through categories
Jarod Alper, A. J. de Jong
We formulate a notion of "geometric reductivity" in an abstract categorical setting which we refer to as adequacy. The main theorem states that the adequacy condition implies that…
Recasting results in equivariant geometry: affine cosets, observable subgroups and existence of good quotients
Jarod Alper, Robert Easton
Using the language of stacks, we recast and generalize a selection of results in equivariant geometry.
Singularities with G_m-action and the log minimal model program for
Jarod Alper, Maksym Fedorchuk, David Ishii Smyth
We give a precise formulation of the modularity principle for the log canonical models of . Assuming the modularity principle holds, we develop and compare two methods f…