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math.DG2021
A Calabi operator for Riemannian locally symmetric spaces
Federico Costanza, Michael Eastwood, Thomas Leistner +1
On a Riemannian manifold of constant curvature, the Calabi operator is a second order linear differential operator that provides local integrability conditions for the range of the…
math.NT2021
Modular forms, projective structures, and the four squares theorem
Michael Eastwood, Ben Moore
It is well-known that Lagrange's four-square theorem, stating that every natural number may be written as the sum of four squares, may be proved using methods from the classical th…