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Let M be a smooth strictly convex closed surface in space and denote by H the set of points x in the exterior of M such that all the tangent segments from x to M have equal lengths. In this note we pr...
Derived Resolution Property for Stacks, Euler Classes and Applications
Derived Resolution Property for Stacks Euler Classes Applications
2010/12/13
By resolving any perfect derived object over a Deligne-Mumford stack, we define its Euler class. We then apply it to define the Euler numbers for a smooth Calabi-Yau threefold in P4. These numbers are...
The Bergman property for endomorphism monoids of some Fraïssé limits
Bergman property for endomorphism monoids Fraï ssé limits
2010/12/3
Based on an idea of Y. P´eresse and some results ofMaltcev, Mitchell and Ruˇskuc,we present sufficient conditions under which the endomorphism monoid of an ultrahomogeneous first-order structure...
SO(d,d;Z) Transformation Property for Gauge Fluxes and
Ramond-Ramond Fields in Noncommutative Geometry
SO(d d Z) spinor noncommutative geometry
2007/8/15
2002Vol.37No.2pp.173-178DOI:
SO(d,d;Z) Transformation Property for Gauge Fluxes and
Ramond-Ramond Fields in Noncommutative Geometry
WANG Pei
Institute of Modern Physics,...
A compact Riemann surface X of genus g is called an (M-1)-surface if it admits an anticonformal involution that fixes g simple closed curves, the second maximum number by Harnack's theorem. If X also ...