5,387 research outputs found
On the Lagrangian fillability of almost positive links
In this paper, we prove that a link which has an almost positive diagram with
a certain condition is Lagrangian fillable.Comment: 14 pages, 10 figures, 1 tabl
The maximal degree of the Khovanov homology of a cable link
In this paper, we study the Khovanov homology of cable links. We first
estimate the maximal homological degree term of the Khovanov homology of the
(, )-torus link and give a lower bound of its homological
thickness. Specifically, we show that the homological thickness of the (,
)-torus link is greater than or equal to . Next, we study
the maximal homological degree of the Khovanov homology of the (,
)-cabling of any knot with sufficiently large . Furthermore, we compute
the maximal homological degree term of the Khovanov homology of such a link
with even . As an application we compute the Khovanov homology and the
Rasmussen invariant of a twisted Whitehead double of any knot with sufficiently
many twists.Comment: 40 pages, 26 figures, I shorten some proof
On Euclidean designs and the potential energy
We study Euclidean designs from the viewpoint of the potential energy. For a
finite set in Euclidean space, We formulate a linear programming bound for the
potential energy by applying harmonic analysis on a sphere. We also introduce
the concept of strong Euclidean designs from the viewpoint of the linear
programming bound, and we give a Fisher type inequality for strong Euclidean
designs. A finite set on Euclidean space is called a Euclidean a-code if any
distinct two points in the set are separated at least by a. As a corollary of
the linear programming bound, we give a method to determine an upper bound on
the cardinalities of Euclidean a-codes on concentric spheres of given radii.
Similarly we also give a method to determine a lower bound on the cardinalities
of Euclidean t-designs as an analogue of the linear programming bound.Comment: 14 page
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