منابع مشابه
Unstable splittings related to Brown-Peterson cohomology
We give a new and relatively easy proof of the splitting theorem of the second author for the spaces in the Omega spectrum for BP . We then give the first published proofs of our similar theorems for the spectra P (n).
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Let U denote the category of unstable modules over the mod 2 Steenrod algebra A, and let Ext(−) = ExtsU(−,ΣZ2). Let M∞ = H̃∗(ΣCP∞ + ) denote the unstable A-module with nonzero classes xi such that i is odd and positive, and Sqx2k+1 = ( k j ) x2(j+k)+1. Then H∗(U) ≈ U(M∞), where the left side is the mod 2 cohomology of the infinite unitary group, and the right side the free unstable A-algebra gen...
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The Zeeman and hyperfine splittings of the emission spectra from mercury vapor lamps are investigated through the use of a Fabry-Perot interferometer. In the absence of a magnetic field, a low-intensity peak near the major 5461 Å emission line can be observed; this yields a hyperfine shift of frequency 12.70 ± 0.19 GHz, consistent with the bHg emission shift of 12.21 GHz. In the presence of dif...
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Thermal instability driven by radiation pressure might be relevant for intrinsically bright accreting sources. The most promising candidate where this instability seems to be at work is one of the two known galactic superluminal sources, GRS 1915+105 (Belloni et al. 1997). In spite of being of relevance, this scenario has not yet been confirmed by proper time-dependent modelling. Non-linear tim...
متن کاملUnstable Module Presentations for the Cohomology of Real Projective Spaces
There is much we still do not know about projective spaces. We describe here how the mod two cohomology of each real projective space is built as an unstable module over the Steenrod algebra A, or equivalently, over K, the algebra of inherently unstable mod two “lower operations” originally introduced by Steenrod. In particular, to produce the cohomology of projective space of each dimension we...
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ژورنال
عنوان ژورنال: Algebraic & Geometric Topology
سال: 2013
ISSN: 1472-2739,1472-2747
DOI: 10.2140/agt.2013.13.1053