4 citations · 6 across the 11 of their papers we have counts for
11 papers
Gröbner Basis Convex Polytopes and Planar Graph
Dang Vu Giang
Using the Gröbner basis of an ideal generated by a family of polynomials we prove that every planar graph is 4-colorable. Here we also use the fact that the complete graph of 5 ver…
Algebroids and Jacobian conjecture
Dang Vu Giang
Using the Galois theory over function field, and the holomorphy of algebroids defined via irreducible polynomial at singular points, we prove the injectivity of any kellerian mappi…
Spectral measure of Laplacean operators in Paley-Wiener space
Dang Vu Giang
We are interested in computing the spectral measure of Laplacean operators in Paley-Wiener space, the Hilbert space of all square integrable functions having Fourier transforms sup…
Persistence and global attractivity in the model
Dang Vu Giang
First, we systemize ealier results the uniform persistence for discrete model of population growth, where is continuous and stri…
Spectrum of a bounded sequence and inhomogeneous delay linear difference equations in a Banach space
Dang Vu Giang
We study the asymptotic behavior of a bounded solution of an inhomogeneous delay linear difference equation in a Banach space by using the spectrum of bounded sequences. We get a s…
Beurling spectrum of functions in Banach space
Dang Vu Giang
We are interested in Beurling spectrum of valued functions with application in functional delay differential equations.
Linear difference equations and periodic sequences over finite fields
Dang Vu Giang
First, we study the linear equations in general. Second, we focus our attention in periodic sequences over finite fields and de Bruijn directed graph.
Congruent number and Elliptic curves
Dang Vu Giang
We prove that if an integral equation has a positive solution then all complex roots of the famous Riemann zeta function are distinct and having the real part 1/2. We also prove th…
Finite Hilbert Transforms Logarithmic Potentials and Singular Integral Equations
Dang Vu Giang
Several interesting formulas concerning finite Hilbert transform and logarithmic integrals are proved with application in determining equilibrium measures, planar limits of analyti…
Omega-limit sets and bounded solutions
Dang Vu Giang
We prove among other things that the omega-limit set of a bounded solution of a Hamilton system \[\left\{\begin{aligned} & \mathbf{\dot{p}}=\frac{\partial H}{\partial \mathbf{q}} &…
Moebius functions Irreducible Polynomials and Dirichlet Series
Dang Vu Giang
We are interested in Moebius function and related topics!