منابع مشابه
Absolute cohomological purity
— GROTHENDIECK'S absolute cohomological purity conjecture is proved for Q7-etale cohomology, and for etale cohomology with 7.1 f coefficients if / is large. The proof depends on Quillen's localization theorem for algebraic K-thcory and my comparison of algebraic and topological X-thcory. In this note, I show how my theorem relating algebraic and topological K-theory yields an absolute cohomolog...
متن کاملAbsolute Quantitative 1H NMR Spectroscopy for Compound Purity Determination
W e encourage our authors to consider the use of absolute quantitative 1 H NMR spectroscopy to determine the purity of biologically tested research compounds. The Perspective by Pauli et al. (DOI: 10.1021/jm500734a) in this issue provides an excellent overview of quantitative 1 H NMR spectroscopy methods and their use for purity determination. The major advantages of these techniques are that t...
متن کاملCohomological Descent
Introduction In classical C̆ech theory, we “compute” (or better: filter) the cohomology of a sheaf when given an open covering. Namely, if X is a topological space, U = {Ui} is an indexed open covering, and F is an abelian sheaf on X, then we get a C̆ech to derived functor spectral sequence E 2 = H (U,H(F ))⇒ H(X,F ), where H(F ) is the presheaf whose value on an open U is H(U,F |U ) (and we use ...
متن کاملMeasurement of Iodine Cell Purity and Absolute Frequency Shifts for Laser Stabilization
− This contribution deals with the investigation of uncertainties achievable through stabilization of lasers using saturated absorption in iodine vapour. The main focus is on the iodine cell technology and evaluation. We present results from two independent methods for the measurement of the purity of molecular iodine in absorption cells. The purity was tested by improved method based on measur...
متن کاملCohomological Bousfield Classes
In this paper, we begin the study of Bousfield classes for cohomology theories defined on spectra. Our main result is that a map f : X → Y induces an isomorphism on E(n)-cohomology if and only if it induces an isomorphism on E(n)-homology. We also prove this for variants of E(n) such as elliptic cohomology and real K-theory. We also show that there is a nontrivial map from a spectrum Z to the K...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Bulletin de la Société mathématique de France
سال: 1984
ISSN: 0037-9484,2102-622X
DOI: 10.24033/bsmf.2014