Báo cáo toán học: " 3-Designs from PGL(2, q)" docx
Báo cáo toán học: " Toxicology of perfluorinated compounds" docx
... possibility of underestimation of PFC exposure through food
contact materials. Mixtures of perfluorooctanesulfonamide esters are often used in the
manufacture of water- and greaseproof papers ... eating 8 g of eel from
Belgium with a concentration of 857 àg PFOS/kg fresh weight or eating 0.6 g of trout from
the upper Sauerland region of Germany with a measured maximum leve...
Báo cáo toán học: "On S-decomposable operators " docx
... class="bi x0 y0 w1 h 1" alt =""
Báo cáo toán học: "Hyponormal operators are subscalar " docx
... class="bi x0 y0 w2 h 3" alt =""
Báo cáo toán học: " A criterion for unimodality" docx
... Math.,
to appear.
[2] BRENTI, F.: Log-concave and unimodal sequences in Algebra, Combinatorics and Geometry:
an update. Contemporary Mathematics, 178, 71-84, 1994.
[3] STANLEY, R.: Log-concave and ... R.: Log-concave and unimodal sequences in algebra, combinatorics and geometry.
Graph theory and its applications: East and West (Jinan, 1986), 500-535, Ann. New York Acad.
Sci., 576,NewYork,1989...
Báo cáo toán học: "Nim-Regularity of Graphs" docx
... parts are all of size one.
Alternately, the complement of such a graph either has no edges or consists of the the
disjoint union of three or fewer complete graphs.
Proof. The complement of K
−
5
is ... similar proofs for complexes of
dimension 2 and higher. We conjecture that the answer is “yes,” but the complexity
of the proof would be astronomical, even for dimension 2. Hidden...
Báo cáo toán học: "Online Coloring Known Graphs" docx
... 68W25.
Keywords: graph coloring, online algorithms.
Abstract
The problem of online coloring an unknown graph is known to be hard.
Here we consider the problem of online coloring in the relaxed ... independence number α are known
in advance. The unknown case can be handled via a doubling technique, see [5].
Without loss of generality, α ≥ n/ log n.Letq =(1/2) log
n/α
n. Before colori...
Báo cáo toán học: "Some Pairwise Balanced Designs" docx
... 231–251.
[29] A. C. H. Ling, Pairwise Balanced Designs and Related Codes, Ph. D. Thesis, Uni-
versity of Waterloo, Canada, 1997.
[30] A. C. H. Ling and C. J. Colbourn, Pairwise balanced designs with ... Pairwise Balanced Designs
Malcolm Greig
Greig Consulting
207-170 East Fifth St.
North Vancouver
BC, Canada, V7L 4L4
greig@sfu.ca
Submitted: Oct. 6, 1998;
Accepted: Oct. 23, 1999.
A...
Báo cáo toán học: "† Pairs of disjoint q-element subsets far from each other" pot
... G
0
=(V,E
0
)andG
1
=(V,E
1
)thatsatisfytherequirementsof
Theorem 1.3. The vertex set V consists of the q-element subsets of X, |V | =
n
q
= N.
Two q-element subsets are adjacent in G
0
if their intersection is empty, while two q-element
subsets ... Y
1
be the set of all disjoint pairs {A, B} of q-element subsets of an
n-element X.
δ
1
({A
1
,B
1
}, { A
2
,B...
Báo cáo toán học: "An Introduction to q -Species" doc
... not q- counting ordinary combinatorial structures
but counting structures associated to vector spaces over the field of order q. Second, a
q- species is a functor from a category of vector spaces to ... λ
i
∈ F
q
.Then
D = E ◦ F where F is the q- species defined
F[V ]=
F
q
, if dim V =1,
∅, otherwise.
Then
F(x)=
q
q − 1
x
D(x)=exp
q
q − 1
x
D(x)=
1
(1 − x)
q
.
Exam...
Báo cáo toán học: "Codes from cubic curves and their extensions" potx
... 2
√
q if p
2
√
q and h ≥ 3 is odd,
q + 2
√
q + 1 otherwise.
(4.1)
Regarding the completeness of the cubic arcs arising from nonsingular cubic curves,
Hirschfeld and Voloch [6] show the ... 2
Codes from cubic curves and their extensions
T. L. Alderson
∗
Mathematical Sciences
University of New Brunswick
Saint John, NB
E2L 4L5
Canada
tim@unbsj.ca
A. A. Bruen
†
El...
Báo cáo toán học: "Determinant expressions for q-harmonic congruences and degenerate Bernoulli numbers" ppt
... combinatorics 15 (2008), #R63 16
Determinant expressions for q-harmonic congruences
and degenerate Bernoulli numbers
Karl Dilcher
∗
Department of Mathematics and Statistics
Dalhousie University, Halifax, ... [p]
q
), (1.4)
for primes p ≥ 3. More recently Shi and Pan [16] extended (1.3) to
H
p−1
(q) ≡
p − 1
2
(1 − q) +
p
2
− 1
24
(1 − q)
2
[p]
q
(mod [p]
2
q
),
for prime...
Báo cáo toán hoc:" Permutation Statistics and q-Fibonacci Numbers " doc
... counted by the Fibonacci numbers. These distribu-
tions will give us q-Fibonacci numbers which are related to the q-Fibonacci numbers of
Carlitz [2], Cigler [3, 4], and Goyt and Sagan [6].
Let the ... produced a class of q-Fibonacci numbers , which
they related to q-Fibonacci numbers studied by Carlitz and Cigler. In this paper we
will study the d istributions of some M...
Báo cáo toán học: "Lower Bounds for q-ary Codes with Large Covering Radius" ppsx
... (i) and (iv) P
3
∩ P
4
= {x} with x ∈ Z
6
. Let R denote a set
the electronic journal of combinatorics 16 (2009), #R133 5
Lower Bounds for q-ary Codes
with Large Covering Radius
Wolfga ng Haas
Immanuel ... the case k = 5. For k > 5 the
computational effort became too la r ge for a systematical treatment. Here we got only a
few sporadic new bounds: six bounds for k...
Báo cáo toán học: " Character Polynomials, their q-analogs and the Kronecker product" potx
... à) and (n ||, ) are partitions for all n ≥ 2k since the hypotheses |à|, || k
the electronic journal of combinatorics 16(2) (2009), #R19 20
Character Polynomials, their q-analogs
and the Kronecker ... #R19 1
The c
,à,
go by the name of Kronecker coeci ents and they may be interpreted as the
multiplicity of the irreducible representation of S
n
indexed by λ in...