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In this short note, we prove that all geodesically convex functions defined on a Riemannian manifold are continuous in the interior of their domain. This is a folklore result, but to the best of our knowledge, there is only one available…

Differential Geometry · Mathematics 2026-01-06 Victor-Emmanuel Brunel , Pierre Pansu

In this paper, we provide a concise proof of Oppenheim's double inequality relating to the cosine and sine functions. In passing, we survey this topic.

Classical Analysis and ODEs · Mathematics 2012-09-04 Feng Qi , Bai-Ni Guo

We obtain explicit smooth Green's functions for annular domain and infinite strip by using kelvin $R$-transform in the Heisenberg group $\H_n$.

Analysis of PDEs · Mathematics 2013-08-27 Shivani Dubey , Ajay Kumar , Mukund Madhav Mishra

In the paper, by induction, the Fa\`a di Bruno formula, and some techniques in the theory of complex functions, the author finds explicit formulas for higher order derivatives of the tangent and cotangent functions as well as powers of the…

Classical Analysis and ODEs · Mathematics 2015-07-21 Feng Qi

We show that every bounded hyperconvex Reinhardt domain can be approximated by special polynomial polyhedra defined by homogeneous polynomial mappings. This is achieved by means of approximation of the pluricomplex Green function of the…

Complex Variables · Mathematics 2011-09-30 Alexander Rashkovskii , Vyacheslav Zakharyuta

We derive a general formula for the product of two Dirichlet series that satisfy Hecke's functional equation. Several examples are provided to demonstrate the applicability of the formula. In addition, we discuss prior work on similar…

Number Theory · Mathematics 2025-03-24 Bruce C. Berndt , Likun Xie

We present several formulae for the large $t$ asymptotics of the Riemann zeta function $\zeta(s)$, $s=\sigma+i t$, $0\leq \sigma \leq 1$, $t>0$, which are valid to all orders. A particular case of these results coincides with the classical…

Number Theory · Mathematics 2022-10-26 A. S. Fokas , J. Lenells

We discuss the validity of a formula concerning a relation between functionals in quantum resonance scattering, which is often used in the current literature.

Mathematical Physics · Physics 2007-05-23 M. Gadella , A. R. Ordoniez

Approximate $p$-point Leibniz derivation formulas as well as interpolatory Simpson quadrature sums adapted to oscillatory functions are discussed. Both theoretical considerations and numerical evidence concerning the dependence of the…

Numerical Analysis · Mathematics 2009-10-31 Gh. Adam , S. Adam

We establish formulae of Stark type for the Stickelberger elements in the function field setting. Our result generalizes a work of Hayes and a conjecture of Gross. It is used to deduce a $p$-adic version of Rubin-Stark Conjecture and Burns…

Number Theory · Mathematics 2007-05-23 Ki-Seng Tan

We provide sharp new estimates for distance function in a Siegel domain of first and of second type

Functional Analysis · Mathematics 2013-02-06 Romi Shamoyan

We give a constructive, metastable formulation of a theorem about the exchange of limits for convergent sequence $L^1$ functions. A crucial tool is a one-dimensional version of Szemeredi's regularity lemma for $L^1$ functions.

Logic · Mathematics 2015-03-17 Henry Towsner

We construct homotopy formulae $f=\overline\partial\mathcal H_qf+\mathcal H_{q+1}\overline\partial f$ for $(0,q)$ forms on the product domain $\Omega_1\times\dots\times\Omega_m$, where each $\Omega_j$ is either a bounded Lipschitz domain in…

Complex Variables · Mathematics 2025-02-04 Liding Yao , Yuan Zhang

It is known that we can construct the meromorphic function $Z_k(s)$ associated with the higher derivative of Hardy's $Z$-function. In this paper, we introduce the entire function derived from $Z_k(s)$, a generalisation of the Riemann…

Number Theory · Mathematics 2021-10-26 Hirotaka Kobayashi

In this note we obtain some distortion results for spirallike functions with respect to a boundary point. In particular, we find the maximal domain covered by all spirallike functions of order $\beta$.

Complex Variables · Mathematics 2007-05-23 Mark Elin

In this paper, we generalize a classical comparison result for solutions to Hamilton-Jacobi equations with Dirichlet boundary conditions, to solutions to Hamilton-Jacobi equations with non-zero boundary trace. As a consequence, we prove the…

Analysis of PDEs · Mathematics 2023-05-18 Vincenzo Amato , Andrea Gentile

We construct a solution operator for $\overline{\partial}$ equation that gains $\frac{1}{2}$ derivative in the fractional Sobolev space $H^{s,p}$ on bounded strictly pseudoconvex domains in $\mathbb{C}^n$ with $C^2$ boundary, for all $1 < p…

Complex Variables · Mathematics 2021-07-20 Ziming Shi , Liding Yao

We generalize Kawamata's product formula for volumes of canonical divisors to arbitrary divisors using Okounkov bodies

Algebraic Geometry · Mathematics 2019-08-27 Sung Rak Choi , Seung-Jo Jung , Jinhyung Park , Joonyeong Won

We establish integral formulas and sharp two-sided bounds for the Ricci curvature, mean curvature and second fundamental form on a Riemannian manifold with boundary. As applications, sharp gradient and Hessian estimates are derived for the…

Differential Geometry · Mathematics 2018-07-10 Feng-Yu Wang

We prove a remarkable formula of Ramanujan for the logarithmic derivative of the gamma function, which converges more rapidly than classical expansions, and which is stated without proof in Ramanujan's notebooks. The formula has a number of…

Classical Analysis and ODEs · Mathematics 2007-06-13 David M. Bradley