An introduction to contact topology by Hansjörg Geiges

By Hansjörg Geiges

This article on touch topology is the 1st complete creation to the topic, together with contemporary amazing purposes in geometric and differential topology: Eliashberg's facts of Cerf's theorem through the category of tight touch constructions at the 3-sphere, and the Kronheimer-Mrowka facts of estate P for knots through symplectic fillings of touch 3-manifolds. beginning with the elemental differential topology of touch manifolds, all elements of three-d touch manifolds are handled during this booklet. One extraordinary function is a close exposition of Eliashberg's class of overtwisted touch buildings. Later chapters additionally take care of higher-dimensional touch topology. the following the focal point is on touch surgical procedure, yet different structures of touch manifolds are defined, resembling open books or fibre attached sums. This ebook serves either as a self-contained creation to the topic for complex graduate scholars and as a reference for researchers.

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B) Let x be a point on C. Then ϕ(x)x = xt Ax = 0, so x also lies on its polar ϕ(x). We want to show that ϕ(x) is actually the tangent to C at x. To that end, assume that y is another point that lies both on C and on the polar ϕ(x) of x, that is, yt Ay = 0 and xt Ay = 0. By (a) we may assume without loss of generality that  −1 A= 0 0  0 0 1 0 , 0 1 P1: xxx CUUK1064-McKenzie 14 December 7, 2007 20:6 Facets of contact geometry and we may then choose homogeneous coordinates for x and y in the form     1 1 x =  x1  , y =  y1  .

Further, we compute dH(XH ) = −ω(XH , XH ) = 0. It is not difficult to see (for instance in a local coordinate representation) that XH is a smooth vector field. The next proposition gives a succinct way of writing the Hamiltonian equations. The statement dH(XH ) = 0 from the preceding lemma can then be read as a mathematical formulation of the preservation of energy. 4 The Hamiltonian equations for a smooth function H on the symplectic manifold (T ∗ B, ω = dλ) can be written in a coordinate-free manner as x˙ = XH (x).

P1: xxx CUUK1064-McKenzie December 7, 2007 20:6 Facets of contact geometry 18 Starting from an arbitrary inner product g on V , one can define a J– compatible inner product g by setting g(u, v) = g(u, v) + g(Ju, Jv). (3) Given a J–compatible inner product g on V , a Hermitian inner product h on V (regarded as a complex vector space as in (1)) can be defined by h(u, v) = g(u, v) + ig(u, Jv). (4) If J is a complex structure compatible with a symplectic form ω, then gJ (u, v) := ω(u, Jv) defines a J–compatible inner product on V .

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