Báo cáo toán học: "Properties of the Steiner Triple Systems of Order 19" pptx

... of order 9 is the system having an automorphism group of order 432, and the other two STS(19) with 12 subsystems of order 7 are the systems having automorphism groups of orders 108 and 144. The ... Nonexistence of perfect Steiner triple systems of orders 19 and 21, Bayreuth. Math. Schr. 74 (2005), 130 –135. [26] P. Kaski and P. R. J. ¨ Osterg˚ard, The Stei...

Ngày tải lên: 08/08/2014, 12:22

... gradient of f 1 nor that of f 2 has a zero in interior of D. So the maximum of f occurs in the set L := {(α, β) : f 1 (α, β) = f 2 (α, β)}, where the gradient of f does not exist or it occurs in the ... o f G. Then the eigenvalues of G are defined as the eigenvalues of A. As all eigenvalues of A are real, we can rearra nge them as λ 1  ···  λ n . I. Gutman (see [9...

Ngày tải lên: 08/08/2014, 01:20

Ngày tải lên: 05/08/2014, 15:20

... 2, 2), let y = the number of quadruples of type (2, 1, 1), (1, 2, 1), or (1, 1, 2), and let z = the number of quadruples of type (1, 1, 1). Also let T 1 be the set of all triples of type (2, 1, ... T 2 be the triples of type (1, 1, 1). Then |T 1 | = 6  g 2  g = 3g 3 −g, and |T 2 | = g 3 . Counting the number of quadruples of each type that cover the triples in...

Ngày tải lên: 07/08/2014, 15:23

... equal if and only if they have the same spectrum [5]. Theorem 2 is a strengthening of this result. The proof of the previous two theorems rely on a theorem of Bass’ in [1]. In the case that G is ... conclude that the number of vertices of G is n. It is well known that the regularity of G, q + 1, is equal to the largest element of the spectrum of G. The number...

Ngày tải lên: 08/08/2014, 01:20

... understanding of the degree of cytotoxicity of the MNPs, we also investigated the effect the polymer-coated nanoparticles had on the integrity of the cell membrane and oxidative stress the MNPs ... account that the basal level of LDH in culture media was about 10% of the control (‘total’ LDH released to the media). The LDH leakage in SH- SY5Y cells increas...

Ngày tải lên: 20/06/2014, 20:20

... arrive at the same time a nd the only difference is the duration of the pulses in these two sys- tems. But the difference of t he durations of the pulses in these two systems is very small when ... we chose the value of D from either GFSK or PPM systems as a common refer- ence value, the signa l energies of these two systems in the time interval [0, D] will b...

Ngày tải lên: 20/06/2014, 21:20

Ngày tải lên: 05/08/2014, 10:20

Ngày tải lên: 05/08/2014, 15:20