We construct two kinds of infinite-dimensional 3-Lie algebras from a given commutative associative algebra, and show that they are all canonical Nambu 3-Lie algebras. We relate their inner derivation algebras to Witt algebras, and then study the regular representations of these 3-Lie algebras and the natural representations of the inner derivation algebras. In particular, for the second kind of 3-Lie algebras, we find that their regular representations are Harish-Chandra modules, and the inner derivation algebras give rise to intermediate series modules of the Witt algebras and contain the smallest full toroidal Lie algebras without center.

This paper concerns with multiple weighted norm inequalities for maximal vector-valued multilinear singular operator and maximal commutators. The Cotlar-type inequality of maximal vector-valued multilinear singular integrals operator is obtained. On the other hand, pointwise estimates for sharp maximal function of two kinds of maximal vector-valued multilinear singular integrals and maximal vector-valued commutators are also established. By the weighted estimates of a class of new variant maximal operator, Cotlar’s inequality and the sharp maximal function estimates, multiple weighted strong estimates and weak estimates for maximal vector-valued singular integrals of multilinear operators and those for maximal vector-valued commutator of multilinear singular integrals are obtained.

In this paper, for homogeneous diffusion processes, the approach of Y. Li and X. Zhou [Statist. Probab. Lett., 2014, 94: 48–55] is adopted to find expressions of potential measures that are discounted by their joint occupation times over semi-infinite intervals (−∞, a) and (a,∞). The results are expressed in terms of solutions to the differential equations associated with the diffusions generator. Applying these results, we obtain more explicit expressions for Brownian motion with drift, skew Brownian motion, and Brownian motion with two-valued drift, respectively.

Let Aand Bbe algebras, and let T be the dual extension algebra of A and B. We provide a different method to prove that Tis Koszul if and only if both A and B are Koszul. Furthermore, we prove that an algebra is Koszul if and only if one of its iterated dual extension algebras is Koszul, if and only if all its iterated dual extension algebras are Koszul. Finally, we give a necessary and sufficient condition for a dual extension algebra to have the property that all linearly presented modules are Koszul modules, which provides an effective way to construct algebras with such a property.

In this note, we investigate the behavior of a smooth flat family of n-dimensional conic negative Kähler-Einstein manifolds. By H. Guenancia’s argument, a cusp negative Kähler-Einstein metric is the limit of conic negative Kähler-Einstein metric when the cone angle tends to 0. Furthermore, it establishes the behavior of a smooth flat family of n-dimensional cusp negative Kähler-Einstein manifolds.

We prove uniform positivity of the Lyapunov exponent for quasiperiodic Schrödinger cocycles with C² cos-type potentials, large coupling constants, and fixed weak Liouville frequencies.

Let P ∈ Sp(2n) satisfying P^k = I_2n. We consider the minimal Psymmetric period problem of the autonomous nonlinear Hamiltonian system \dot{x}(t)=J{H}^{\prime }(x(t)). For some symplectic matrices P, we show that for any τ>0, the above Hamiltonian system possesses a kτ periodic solution x with kτ being its minimal P-symmetric period provided H satisfies Rabinowitz’s conditions on the minimal period conjecture, together with that H is convex and H(Px) = H(x).

Let g be a holomorphic or Maass Hecke newform of level D and nebentypus χ_D, and let a_g(n) be its n-th Fourier coefficient. We consider the sum and prove that S1 has an asymptotic formula when β = 1/2 and αis close to \pm \mathrm{2}\sqrt{q/D} for positive integer q\le X/\mathrm{4} and X sufficiently large. And when 0<β<1 and α, β fail to meet the above condition, we obtain upper bounds of S₁. We also consider the sum {{\displaystyle S}}_{\mathrm{2}}={\displaystyle {\sum }_{n>\mathrm{0}}{{\displaystyle a}}_g}(n)e({an}^{\beta })\varphi (n/X) with \varphi (x)\in {{\displaystyle C}}_c^{\infty }(\mathrm{0},+\infty ) and prove that S₂ has better upper bounds than S₁ at some special α and β.

The subject matter of this paper is an integral with exponential oscillation of phase f(x) weighted by g(x) on a finite interval [α, β]. When the phase f(x) has a single stationary point in (α, β), an nth-order asymptotic expansion of this integral is proved for n\ge \mathrm{2}. This asymptotic expansion sharpens the classical result for n = 1 by M. N. Huxley. A similar asymptotic expansion was proved by V. Blomer, R. Khan and M. Young under the assumptions that f(x) and g(x) are smooth and g(x) is compactly supported on ?. In the present paper, however, these functions are only assumed to be continuously differentiable on [α, β] 2n + 3 and 2n + 1 times, respectively. Because there are no requirements on the vanishing of g(x) and its derivatives at the endpoints α and β, the present asymptotic expansion contains explicit boundary terms in the main and error terms. The asymptotic expansion in this paper is thus applicable to a wider class of problems in analysis, analytic number theory, and other fields.

In this paper, two recursive inequalities for crossing numbers of graphs are given by using basic counting method. As their applications, the crossing numbers of K_{1,3,n}and K_{4,n}\backslash e are determined, respectively.

Let \{X_i={(X_{1,i}, . . .,X_{m,i})}^{\mathrm{T}}, i\ge 1\}be a sequence of independent and identically distributed nonnegative m-dimensional random vectors. The univariate marginal distributions of these vectors have consistently varying tails and finite means. Here, the components of X_1 are allowed to be generally dependent. Moreover, let N(·) be a nonnegative integer-valued process, independent of the sequence \{X_i, i\ge 1\}.Under several mild assumptions, precise large deviations for S_n={\displaystyle {\sum }_{i=1}^n{X}_i}\mathrm{ }and S_{N(t)}={\displaystyle {\sum }_{i=1}^{N(t)}{X}_i}\mathrm{ }are investigated. Meanwhile, some simulation examples are also given to illustrate the results.

We introduce and study the concept of (weak) pseudotwistor for a nonlocal vertex algebra, as a generalization of the notion of twistor. We give the relations between pseudotwistors and twisting operators. Furthermore, we study the inverse of an invertible weak pseudotwistor and the composition of two weak pseudotwistors.

Let γbe the Gauss measure on ℝⁿ.We establish a Calderón-Zygmund type decomposition and a John-Nirenberg type inequality in terms of the local sharp maximal function and the median value of function over cubes. As an application, we obtain an equivalent characterization of known BMO space with Gauss measure.