36 citations · 166 across the 32 of their papers we have counts for
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math.SG2015★ 4 cited
Existence h-principle for Engel structures
Roger Casals, Jose Luis Pérez, Álvaro del Pino +1
In this article we prove that the inclusion of the space of Engel structures of a smooth -fold into the space of full flags of its tangent bundle induces surjections in all homo…
math.SG2015★ 9 cited
Geometric criteria for overtwistedness
Roger Casals, Emmy Murphy, Francisco Presas
We establish geometric criteria to decide whether a contact manifold is overtwisted. Starting with the original definition, we first relate the different overtwisted disks in each…