Báo cáo toán học: "Phytophthora species in oak forests of north-east France" pptx
Báo cáo toán học: "Phytophthora species in oak forests of north-east France" pptx
...
term
dynamics
of
oak
ecosystems:
assessment
of
the
role
of
root
pathogens
and
environmental
constraints
as
interacting
decline
inducing
factors"
(PATHOAK).
References
[1
] ...
hosts,
including
oak,
and
it
was
isolated
from
fine
roots
and
collar
stripe
cankers
on
oak
in
Germany
[17].
Its
ecological
role
remains
unclear.
It
is
an
interest-...
Báo cáo toán học: "A Discontinuity in the Distribution of Fixed Point Sums" pps
... See
http://mathworld.wolfram.com/BernsteinPolynomial.html
the electronic journal of combinatorics 10 (2003), #R15 17
A Discontinuity in the Distribution
of Fixed Point Sums
Edward A. Bender
Department of Mathematics
University of ... an interesting steep drop from r = n to r = n + 1, and this paper arose in
providing a quantification of the observed plunge. We think that this pro...
Báo cáo toán học: "Perfect codes in Cartesian products of 2-paths and infinite paths" pptx
... vertex in Q
k
(x)containsk+1 vertices in Q
k
(x). A ball centered
on some vertex in a Q
k
(y) such that d(y, x) = 1 contains exactly one vertex in Q
k
(x).
We consider γ theminimumnumberofverticesofthecodewecanfindinaQ
k
(x).
Let ... perfect
binary single-error correcting code of length k is a perfect code on the hypercube Q
k
,and
a tiling of the grid Z
n
by balls of radius 1 is...
Báo cáo toán học: "Maximum matchings in regular graphs of high girth" ppt
... The set of incidence vectors of the matchings of G have a
convex hull which is equal to the polytope containing all x ∈ R
E
which satisfy the following
the electronic journal of combinatorics ... matching (or one-factor) of G is a subgraph of G in which each vertex has
degree at most one. A basic question in combinatorial optimization is, “What is the size of a
maximum match...
Báo cáo toán học: " Constructing fifteen infinite classes of nonregular bipartite integral graphs" doc
... search. In this paper, a new
method of constructing fifteen in nite classes of integral graphs is presented. In getting
the results we proceed as follows: firstly, we give the construction of the (in nite) ... Cao, Integral trees of diameter R (3 ≤ R ≤ 6) (in Chinese), Heilongjiang Daxue
Ziran Kexue Xuebao (2) (1988) 1-3, 95.
[4] Z.F. Cao, Introductory Diophantine Equations (in C...
Báo cáo toán học: "Counting subwords in a partition of a set" potx
... generating functions for the
number of words π of length n over the alphabet [a] according to the numb er of occurrences
of τ = 22 · · ·21 in π and according to the number of occurrences of τ in ... patterns, includ ing all
words of length 3. In addition, we find simple explicit formulas for the total number
of occurrences of the patterns in q uestion within all the p...
Báo cáo toán học: "Colorful Paths in Vertex Coloring of Graphs" pps
... generalization of the Gallai-Roy theorem, Graphs and Combinatorics 17
(2001) 681-685.
[6] C. Lin, Simple proofs of results on paths representing all colors in proper vertex-
colorings, Graph and Combinatorics ... u and v in T (G, v) is called an ancestor of u. By Theorem 6.6 of [2], in
every DFS tree if w and w
′
are adjacent, then one of them is a ncestor of another.
In a...
Báo cáo toán học: "hree gradients in the architecture of trees." potx
... constraint in
the structure of trees or indeed all higher plants.
If we seek meaning in the list as a whole there
remains the task of “seeing the wood for the trees”,
selecting and arranging them into ... Gradients
But the intended purpose of the rules was to aid the
discovery of basic principles of tree architecture. In this
the rules have individual roles, but also roles i...
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