Báo cáo toán học: "Proof of the combinatorial nullstellensatz over integral domains, in the spirit of Kouba" docx

... electronic journal of combinatorics 17 (2010), #N14 4 Proof of the combinatorial nullstellensatz over integral domains, in the spirit of Kouba Peter Heinig ∗ Lehr- und Forschungseinheit M9 f¨ur Angewandte ... substantially), and it is the purpose of the present note to try to lay bare the basic mechanism of Kouba’s proof. 2 Proof of Theorem 2 The proof o...

Ngày tải lên: 08/08/2014, 11:20

... an arbitrary half of the endvertices of M i in A i by A  i . The set of endvertices of the edges of M i in B i which are not matched to vertices in A  i is denoted by B  i . Consider the complete bipartite ... question whether perhaps this is the only q value which results in a linear f (n, p, q). In this paper we study the behavior of f(n, p, q) between...

Ngày tải lên: 07/08/2014, 07:21

... (1998) #R28 2 Since any latin square can be transformed into a fixed diagonal latin square by a permutation of rows, and since permuting rows does not change the sign of a latin square of even order, ... 1998. Abstract The Alon-Tarsi conjecture states that for even n, the number of even latin squares of order n differs from the number of odd latin squares of order n. Zappa...

Ngày tải lên: 07/08/2014, 06:22

... prove the Razumov–Stroganov conjecture relating ground state of the O(1) loop model and counting of Fully Packed Loops in the case of certain types of link patterns. The main focus is on link patterns ... symmetric polynomial of the {α i } of degree at most a in each, of the {β i } of degree at most b in each, and of the {γ i } of degree at most c in...

Ngày tải lên: 07/08/2014, 13:21

... the edge containing this cluster if it exists (otherwise e 1 = ∅). Let M in = M ′ in − {e 1 } if |M ′ in − {e 1 }| ≤ k/2; otherwise let M in be a sub- matching of M ′ in − {e 1 } of size ⌊k/2⌋. This ... maximum family of vertex-disjoint 2-paths with mid-points in V (G) \(A ∪ B 1 ) and both end-points in A. Let B 2 be the set of the mid-points f r om min{|F|, n − |A...

Ngày tải lên: 08/08/2014, 12:23

... In addition to the illustration of the vital role of nitrogen sources for the enzyme synthesis, the results of our study showed that supplementation of phosphate in the culture medium in the ... 168. Accordingly, the phytase-encoding gene was cloned in the pMSP3535 vector, and then, for the first time for a plasmid carrying the pAMβ1 replication origin, m...

Ngày tải lên: 20/06/2014, 20:20

Ngày tải lên: 05/08/2014, 15:21

... graphs. One of the fundamental questions first studied in extremal graph theory is the question of bounding the size of an intersecting family of sets. The most basic theorem in this vein is the Erd˝os-Ko-Rado ... Erd˝os-Ko-Rado theorem ([2]) that states that if k ≤ n/2andF is an intersecting family of k-subsets of {1, ,n} then |F |≤  n−1 k−1  . The theorem we pre...

Ngày tải lên: 07/08/2014, 13:21

... molecular modeling of protein structure, indicate that b-strand 7 of the a-crystallin domain is an integral component of the p26 dimer–dimer interface in polydisperse sHSPs. p26 chaperoning is not ... with insulin for 30 min in the presence of dithiothreitol, and solution turbidity was measured at 400 nm. The p26 variants tested are indicated in the figure and they ap...

Ngày tải lên: 07/03/2014, 12:20

... Furthermore, the status of one binding site could in uence the binding of the regulatory protein to the other, representing cooperativity [5,6]. A regulatory protein may be the product of the ... interaction leading to gene expression. The status of the switch is determined by the state of the upstream regulatory element of the GAL genes in the nucleus....

Ngày tải lên: 07/03/2014, 16:20