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math.GT2000★ 84 cited
On a conjecture of Atiyah
R. I. Grigorchuk, P. Linnell, T. Schick +1
In this note we explain how the computation of the spectrum of the lamplighter group from \cite{Grigorchuk-Zuk(2000)} yields a counterexample to a strong version of the Atiyah conj…
math.SG2000★ 5 cited
Dual elliptic structures on CP2
Jean-Claude Sikorav
We consider an almost complex structure J on CP2, or more generally an elliptic structure E which is tamed by the standard symplectic structure. An E-curve is a surface tangent to…