منابع مشابه
New Ramsey Classes from Old
Let C1 and C2 be strong amalgamation classes of finite structures, with disjoint finite signatures σ and τ . Then C1∧C2 denotes the class of all finite (σ∪τ)-structures whose σ-reduct is from C1 and whose τ -reduct is from C2. We prove that when C1 and C2 are Ramsey, then C1 ∧ C2 is also Ramsey. We also discuss variations of this statement, and give several examples of new Ramsey classes derive...
متن کاملCharacteristic Classes
These are lecture notes for a series of five lectures I gave to other graduate students about characteristic classes through UT Austin’s summer minicourse program (see https://www.ma.utexas.edu/users/ richard.wong/Minicourses.html for more details). Beware of potential typos. In these notes I cover the basic theory of Stiefel-Whitney, Wu, Chern, Pontrjagin, and Euler classes, introducing some i...
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We prove Poincar e Duality for L p cohomology, 1 p 1 We study the pairings between L p and L 1 and construct characteristic classes.
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متن کاملM-theory and characteristic classes
In this note we show that the Chern-Simons and the one-loop terms in the M-theory action can be written in terms of new characters involving the M-theory four-form and the string classes. This sheds a new light on the topological structure behind M-theory and suggests the construction of a theory of “higher” characteristic classes. E-mail: [email protected] Research supported by the A...
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ژورنال
عنوان ژورنال: Bulletin of the American Mathematical Society
سال: 1969
ISSN: 0002-9904
DOI: 10.1090/s0002-9904-1969-12280-9