Results 11 to 20 of about 165,979,158 (232)
Tree Rings and Forest Mensuration: How Can They Document Trends in Forest Health and Productivity?
, 1986 A workshop sponsored by the National Council of the Paper Industry for Air and Stream Improvement (NCASI) and the National Vegetation Survey - EPA/USFS Forest Response Program.
University of Arizona. Laboratory of Tree-Ring Research.
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The étale cohomology ring of the ring of integers of a number field
Research in Number Theory, 2023 AbstractWe compute the cohomology ring $$H^*(X,{{\mathbb {Z}}}/n{{\mathbb {Z}}})$$ H ∗ ( X , Z /
Eric Ahlqvist, Magnus Carlson
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Density of Tree-Ring Grids in Western North America
, 1982 The separating distance over which tree-ring chronologies are significantly correlated is investigated. Any chronology occuring within a radius of 161 km of another is estimated to contain at least half of the common variance occurring at zero separating
Cropper, John Philip, Fritts, Harold C.
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Integral cohomology and chern classes of the special linear group over the ring of integers [PDF]
, 2001 This paper is devoted to the complete calculation of the additive structure of the 2-torsion of the integral cohomology of the innite special linear group SL(Z) over the ring of integers Z.
Arlettaz, Dominique +3 more
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Polyadic rings of p-adic integers
Symmetry, 2022 In this note we, first, recall that the sets of all representatives of some special ordinary residue classes become $\left( m,n\right) $-rings. Second, we introduce a possible $p$-adic analog of the residue class modulo a $p$-adic integer. Then, we find the relations which determine, when the representatives form a $\left( m,n\right) $-ring.
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Torsion-free crystallographic groups with indecomposable holonomy group II. [PDF]
, 2004 Let K be a principal ideal domain, G a finite group, and M a KG-module which is a free K-module of finite rank on which G acts faithfully. A generalized crystallographic group is a non-split extension C of M by G such that conjugation in C induces the G ...
Bódi, Viktor +3 more
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Nondefinability of Rings of Integers in Most Algebraic Fields [PDF]
Notre Dame Journal of Formal Logic, 2021 We show that the set of algebraic extensions $F$ of $\mathbb{Q}$ in which $\mathbb{Z}$ or the ring of integers $\mathcal{O}_F$ are definable is meager in the set of all algebraic extensions.
Philip Dittmann, Arno Fehm
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Endomorphisms and Product Bases of the Baer-Specker Group
International Journal of Mathematics and Mathematical Sciences, 2009 The endomorphism ring of the group of all sequences of integers, the Baer-Specker group, is isomorphic to the ring of row finite infinite matrices over the integers.
E. F. Cornelius
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Algebraic Structure of Neutrosophic Duplets in Neutrosophic Rings
Neutrosophic Sets and Systems, 2018 The concept of neutrosophy and indeterminacy I was introduced by Smarandache, to deal with neutralies. Since then the notions of neutrosophic rings, neutrosophic semigroups and other algebraic structures have been developed.
Vasantha W.B +2 more
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Response of Tree-Ring Density to Climate in Maine, U.S.A.
, 1979 Cores of red spruce (Picea rubens Sarg.) from three upper-elevation sites in Maine, U.S.A., were X-rayed, and minimum and maximum wood densities as well as ring widths were mechanically recorded.
Conkey, Laura E.
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