نتایج جستجو برای: multiplicative function

تعداد نتایج: 1224111  

Journal: :Journal of the Australian Mathematical Society 1981

Journal: :Transactions of the American Mathematical Society 1965

Journal: :Functiones et Approximatio Commentarii Mathematici 2017

Journal: :Annales Polonici Mathematici 1968

Journal: :JCP 2014
Xuegang Hu Yuefang Lou Tianqiao Hu

In this paper, a novel variational model with strict convexity for removing multiplicative noise from images is proposed and studied. Firstly, by applying maximum likelihood estimation method and the Bayesian formulation, the variational model is derived. Then, we use an alternating minimization algorithm to find out the minimizer of the objective function, and prove the existence of the minimi...

Journal: :Electr. J. Comb. 2001
Yifan Yang

Let D(s) = ∑∞ m=1 amm −s be the Dirichlet series generated by the infinite product ∏∞ k=2(1− k−s). The value of am for squarefree integers m with n prime factors depends only on the number n, and we let f(n) denote this value. We prove an asymptotic estimate for f(n) which allows us to solve several problems raised in a recent paper by M. V. Subbarao and A. Verma.

2003
PENTTI HAUKKANEN

A multiplicative function f is said to be specially multiplicative if there is a completelymultiplicative function fA such that f(m)f(n)= ∑ d|(m,n) f (mn/d)fA(d) for allm andn. For example, the divisor functions and Ramanujan’s τ-function are specially multiplicative functions. Some characterizations of specially multiplicative functions are given in the literature. In this paper, we provide so...

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