351 citations · 2.7k across the 82 of their papers we have counts for
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math-ph2002★ 72 cited
Spectral Properties of Hypoelliptic Operators
J. -P. Eckmann, M. Hairer
We study hypoelliptic operators with polynomially bounded coefficients that are of the form K = sum_{i=1}^m X_i^T X_i + X_0 + f, where the X_j denote first order differential opera…
math-ph2002★ 18 cited
The Number of Large Graphs with a Positive Density of Triangles
Pierre Collet, Jean-Pierre Eckmann
We give upper and lower bounds on the number of graphs of fixed degree which have a positive density of triangles. In particular, we show that there are very few such graphs, when…