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math.AT2013
Topological modular forms with level structure
Michael Hill, Tyler Lawson
The cohomology theory known as Tmf, for "topological modular forms," is a universal object mapping out to elliptic cohomology theories, and its coefficient ring is closely connecte…
math.AT2013★ 1 cited
A note on H_infinity structures
Tyler Lawson
We give a source of examples of H_infinity ring structures that do not lift to E_infinity ring structures, based on Mandell's equivalence between certain cochain algebras and space…
math.AT2013
The Shimura curve of discriminant 15 and topological automorphic forms
Tyler Lawson
We find defining equations for the Shimura curve of discriminant 15 over Z[1/15]. We then determine the graded ring of automorphic forms over the 2-adic integers, as well as the hi…