Báo cáo toán học: "Unitary equivalence of restricted shifts " pdf

... present the PL study on the CMT bulk crystals grown by the vertical Bridgman method to investigate the variation of the band-edge transition energy in the PL spectra as a function of Mn composition ... full text (HTML) versions will be made available soon. Photoluminescence characteristics of Cd1-xMnxTe single crystals grown by the vertical Brid...

Ngày tải lên: 20/06/2014, 20:20

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Ngày tải lên: 20/06/2014, 20:20

... in the composite thick films. The calculation of the contents of the Al 2 O 3 in the composite thick films: (a) the Hashin-Shtrikman bounds of contents of Al 2 O 3 in composite thick films ... existence of α-Al 2 O 3 in the composite thick films and to examine the variations in crystallinity according to the changes in the mixing ratio. The cr...

Ngày tải lên: 20/06/2014, 20:20

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Ngày tải lên: 05/08/2014, 10:20

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Ngày tải lên: 05/08/2014, 15:20

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Ngày tải lên: 05/08/2014, 15:20

... idempotent of S is of form (e, 0), where e 2 = e ∈ R. Proposition 2.1. Let R be a commutative ring and I an ideal of R.LetS = R ∝ I be the trivial extension of R by I.IfS is an ACS-ring, so is R. Proof. ... Rr R (X)=l R (X) for any subset X of R and that any idempotent of R is central. (5) ⇔ (7). Note that l R (aR)=l R (RaR) for any a ∈ R. (5) ⇔ (6). The proof is similar to that...

Ngày tải lên: 06/08/2014, 05:20

... The transversals of V are in one-to-one correspondence with the matchings in G covering the part N; and a local replacement in this language corresponds to changing a single edge in the matching. Let ... V n of n-tuples of elements of M forms the Hamming graph; two n-tuples being adjacent whenever they differ in only one coordinate. Ev- ery matroid structure on M determin...

Ngày tải lên: 07/08/2014, 06:20

... 10, 7). As discussed in the proof of Proposition 2, the equality of the diagram squares of rank at most m − 3 for π and σ =Φ m (π)meansthatσ i = π i for all i for which there exist at most m ... upper-right corner of the array, and travels along the boundary of the connected component of the diagram squares of rank zero. (It follows from the lower bound for the rank of...

Ngày tải lên: 07/08/2014, 07:21

... of a cycle or a union of cycles of the permutation π : x → 2x of Z n (the map is a permutation since gcd(2,n) = 1). Only one cycle of D (and of π) has length 1, namely {0}.Foreachm-cycle C of ... family of all k-cycles by C k . For example, a 2-cycle consists of a pair of vertices and a pair of edges such that the pair of vertices is a subset of each edge. The above...

Ngày tải lên: 07/08/2014, 07:21

... Pro- ceedings of the National Academy of Sciences of the United States of America, 75:40– 42, 1978. [13] Curtis Greene and Herbert S. Wilf. Closed form summation of C-finite sequences. Transactions of the ... shift equivalent. 4 Shift Equivalence of P-finite Sequences The algorithm for the P-finite case consists of a case distinction: either the question can be reduced to a...

Ngày tải lên: 07/08/2014, 13:21

... 6. In the notation of Lemma 5 the number of common neighbors of distinct vertices a, b in the unitary Cayley graph X n is given by F n (a − b). Proof. Let a, b, z be elements of V (X n ) = Z n = ... a sequence ˜ S of length m which consists of all nonzero eigen- values of X n such that the number of appearences of an eigenvalue is its multiplicity. the electronic journal...

Ngày tải lên: 07/08/2014, 15:22

... t  2 (m−2−ν)(n−n 0 −···−n 2 m−2 −1)+n 0 +···+n 2 m−2 −1 . Proof. The formulas follow from Corollary 3.2 and simple counting arguments. 4 B n -orbits in Tuples of Dihedral Groups The dihedral group D N of order 2N is given by the ... (2008), #R80 2 Hurwitz Equivalence in Tuples of Generalized Quaternion Groups and Dihedral Groups Xiang-dong Hou Department...

Ngày tải lên: 07/08/2014, 21:20

... journal of combinatorics 16 (2009), #R95 5 Hurwitz Equivalence in Tuples of Dihedral Groups, Dicyclic Groups, and Semidihedral Groups Charmaine Sia Department of Mathematics Massachusetts Institute ... Gorenstein, Finite Groups, 2nd ed., Chelsea Publishing Company, New York, 1980. [3] X. Hou, Hurwitz equivalence in tuples of generalized quaternion groups...

Ngày tải lên: 08/08/2014, 01:20

... each of which has a parallel class in one colour. The proof depends on the construction of a biembedding of a pair of Latin squares of side p, one of which has p 2 (p − 2)/8 subsquares of side ... biembeddings of Latin squares where paratopic copies are a llowed, and statements about particular realizations of Latin squares. For Latin squares A and A ′ with common...

Ngày tải lên: 08/08/2014, 01:20