Symplectic embeddings and continued fractions: a survey


DOI: 10.1007/s11537-009-0926-9

Cite this article as:
McDuff, D. Jpn. J. Math. (2009) 4: 121. doi:10.1007/s11537-009-0926-9


As has been known since the time of Gromov’s Non-squeezing Theorem, symplectic embedding questions lie at the heart of symplectic geometry. After surveying some of the most important ways of measuring the size of a symplectic set, these notes discuss some recent developments concerning the question of when a 4-dimensional ellipsoid can be symplectically embedded in a ball. This problem turns out to have unexpected relations to the properties of continued fractions and of exceptional curves in blow ups of the complex projective plane. It is also related to questions of lattice packing of planar triangles.

Keywords and phrases:

symplectic embeddingsymplectic capacitycontinued fractionssymplectic ellipsoidsymplectic packinglattice points in triangles

Mathematics Subject Classification (2000):


Copyright information

© The Mathematical Society of Japan and Springer Japan 2009

Authors and Affiliations

  1. 1.Department of MathematicsBarnard College, Columbia UniversityNew YorkUSA