Báo cáo toán học: "A multipartite version of the Tur´n problem a density conditions and eigenvalues" doc

... to Ala eliminated activity in binding to a BPA molecule, and individual mutations drastically reduced the activity. Because Ala lacks the character- istic side chains of Glu and Arg, the mutant ... Glu275Ala, cgg for Glu275Arg, gac for Glu275Asp, and ctg for Glu275Leu); 5Â-TCCTTGGTGTCGTATACxxxTCTCTTTCA-3Â (xxx ẳ gcg for Arg316 fi Ala, aag for Arg316 fi Lys, ctg for Arg31...

Ngày tải lên: 18/02/2014, 16:20

... CAS E REP O R T Open Access Medial pelvic migration of the lag screw in a short gamma nail after hip fracture fixation: a case report and review of the literature Xinning Li * , Michael J ... al.: Medial pelvic migration of the lag screw in a short gamma nail after hip fracture fixation: a case report and r...

Ngày tải lên: 20/06/2014, 04:20

... migration of the lag screw in a short gamma nail after hip fracture fixation: a case report and review of the literature Xinning Li * , Michael J Heffernan, Christina Kane, Walter Leclair Abstract Hip ... compression of the fracture and dynamization of the nail in the setting of an unstable fracture pattern, there was togg ling...

Ngày tải lên: 20/06/2014, 07:20

... − 2 3  2π 2 − 46 3  . The fourth derivative of the HC on the argument n, and the common radius is of the form Figure 8 The HC and its derivative with the HC maximum location and optimum for the value of the degree ... 2)  . In general, the HC of the mth derivative of n can be defined on the basis of the pro- duct of polygamma (psi) polynomial of t...

Ngày tải lên: 20/06/2014, 21:20

... - - - Theorem 2.2. The Rudvalis group Ru is pX-c omplementary generated, if p is an odd prime divisor of |Ru| . nX-Complementary Generations of the Rudvalis Group Ru 7 9. M. R. Darafsheh and A. ... Δ  Ru (pY, 5B,29A) > 0andsoRu is 5B-complementary generated. Vietnam Journal of Mathematics 33:1 (2005) 1–7 nX-Complementary Generations of the Rudvalis G...

Ngày tải lên: 06/08/2014, 04:21

... 13, 1994. Abstract. Bounds on the number of simple zeros of the derivatives of a function are used to give bounds on the number of distinct zeros of the function. The Riemann ξ-function is defined ... generically, the left side of (7) equals N (j) s (T ). In other words, the zeros of the derivatives of a generic function are all simple, except for thos...

Ngày tải lên: 07/08/2014, 06:20

... that the maximum degrees of all iterated line graphs, with the exception of paths, eventually attain the maximum growth rate of ∆ k+1 =2∆ k −2. In this paper, we say that a graph G has the Maximum ... following bounds for the maximum degree ∆ k and minimum degree δ k of the iterated line graph L k (G): 2 k (δ 0 − 2) + 2 ≤ δ k ≤ ∆ k ≤ 2 k (∆ 0 − 2) + 2. Thus,...

Ngày tải lên: 07/08/2014, 06:20

... ···<A n .In other words, the function γ restricted to the standard n 2 -variable submatrices of v is the lift of an r-coloring γ  of the set  F({1, ,L})  n < . By the choice of L, there thus exist ... regular words (that is, elements of W M k ) 0-variable words, then the Hales-Jewett theorem corresponds to the case n =0,t = 1 of Theorem 1.4. Theorem 1.4 Le...

Ngày tải lên: 07/08/2014, 06:20

... the elements s 1 , s 2 , . . . together with the cluster monomials x p m x q m+1 for all m ∈ Z and p, q ≥ 0, form a Z -basis of A referred to as the semicanonical basis. As a special case of the ... integer coefficients. the electronic journal of combinatorics 14 (2007), #N4 2 Using the proof of Theorem 2.1, we derive the explicit formulas for the elements x m and...

Ngày tải lên: 07/08/2014, 13:21

... (5) The proof of (3) is completely combinatorial, the proof of (4) uses nothing more than the fundamental theorem of algebra, and the proof of (5) is a simple geometric argument. Proof of (3). The ... hooks in the diagram of λ. Many proofs of this fact have been given, of varying complexity. We present here an elementary new proof which uses nothing mor...

Ngày tải lên: 07/08/2014, 15:23

... and Q be finite sets of points in the plane. In this note we consider the largest cardinality of a subset of the Minkowski sum S ⊆ P ⊕ Q which consist of convexly independent points. We show that, ... X of n points in the plane, what is the maximum number of pairs that can be selected from X so that the midpoints of their connecting segments are convexly indepe...

Ngày tải lên: 07/08/2014, 15:23

... respectively, the number of triangles congruent to T 1 and the number of triangles congruent to T 2 used in such dihedral f-tilings; ã G() is the symmetry group of the f-tiling τ . The numbers of isohedrality-classes and ... avoid the same situation of incompatibility as the one shown in Figure 16. the electronic journal of combinatorics 15 (2008), #R91 9...

Ngày tải lên: 07/08/2014, 21:20

... f-Tilings of the Sphere by Equilateral and Scalene Triangles- II, Electron. J. Combin., 15 (2008), R91. [6] A. M. d’Azevedo Breda and A. F. Santos, Dihedral F-Tilings of the Sphere by Spheri- cal Triangles ... 65.56 ◦ 34.72 ◦ π 4 114.44 ◦ 16 32 Table 2: Dihedral f-Tilings of the Sphere by Equilateral and Scalene Triangles References [1] C. P. A...

Ngày tải lên: 07/08/2014, 21:21

... A proof of the Kahn-Lov´asz theorem The entropy proof of the Kahn-Lov´asz theorem is complicated by the fact that there can be edges of the graph (and a fixed matching) amongst the neighbors of ...  E is independent of the event {x  V y}. Proof. For any permutation of the edges of m, there is a permutation of V (G) inducing it. Therefore, the unif...

Ngày tải lên: 08/08/2014, 12:23

... of Andr´as G´acs and M´at´e Sal´at Abstract In this paper we propose a multipartite version of the classical Tur ´an problem of determining the minimum number of ed ges n eeded for an arbitrary ... a lemma about the o ptimal constructions: it says that optimal con- structions may have relatively few vertices. The lemma is the generalization of a claim in the...

Ngày tải lên: 08/08/2014, 12:23