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Contact Name
Herry Pribawanto Suryawan
Contact Email
kamindo.imas@gmail.com
Phone
+6281573208422
Journal Mail Official
kamindo.imas@gmail.com
Editorial Address
Department of Mathematics, Faculty Science and Technology, Sanata Dharma University, Yogyakarta 55283, Indonesia
Location
Kab. sleman,
Daerah istimewa yogyakarta
INDONESIA
Hilbert Journal of Mathematical Analysis
ISSN : -     EISSN : 29857619     DOI : https://doi.org/10.62918
Hilbert Journal of Mathematical Analysis (Hilbert J. Math. Anal.) is a peer-reviewed, open-access international journal publishing original and high-quality research papers that treat mathematical analysis, geometry, topology, and all closely related topics. It is published by Komunitas Analisis Matematika Indonesia (Kamindo)/Indonesian Mathematical Analysis Society. The Hilbert Journal of Mathematical Analysis (Hilbert J. Math. Anal.) is published by Komunitas Analisis Matematika Indonesia (Kamindo). The Hilbert Journal of Mathematical Analysis is a peer-reviewed, open access international journal publishing original and high quality research papers that treat mathematical analysis, geometry, topology and all closely related topics. This journal particularly focuses on the main problems in the following, but not limited to, areas: Real Functions Measure and Integration Complex Functions (one and several variables) Potential Theory Special Functions Ordinary Differential Equations Partial Differential Equations Dynamical Systems and Ergodic Theory Sequence, Series and Summability Approximation and Expansion Harmonic Analysis (on Euclidean and Abstract Spaces) Integral Transform, Operational Calculus Integral Equations Functional Analysis Operator Theory Geometry Convex Geometry and Discrete Geometry Differential Geometry General Topology Global Analysis, Analysis on Manifold Probability Theory and Stochastic Processes Numerical Analysis
Arjuna Subject : Matematika - Analisis
Articles 32 Documents
On the angle between two subspaces of an inner product space Hendra Gunawan
Hilbert Journal of Mathematical Analysis Vol. 4 No. 1 (2025): Hilbert J. Math. Anal.
Publisher : KOMUNITAS Analisis Matematika INDONESIA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62918/hjma.v4i1.48

Abstract

In this paper, we shall discuss two formulae for the angle between two subspaces, or more generally the angle from a subspace of dimension $p$ to another subspace of dimension $q$ with $1\le p\le q\le \dim(X)$, in an inner product space $X$. In particular, we shall see that the two seemingly different formulae, one is obtained by H. Gunawan, O. Neswan, and W. Setya-Budhi in 2005 and the other by N. Wildberger in 2017, are actually identical.
Contributions to three-dimensional Hardy-Hilbert-type integral inequalities Christophe Chesneau
Hilbert Journal of Mathematical Analysis Vol. 4 No. 1 (2025): Hilbert J. Math. Anal.
Publisher : KOMUNITAS Analisis Matematika INDONESIA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62918/hjma.v4i1.50

Abstract

This article presents new extensions of the classical Hardy-Hilbert integral inequality involving primitive functions in three dimensions. Two complementary theorems are established, each providing a sharp upper bound for triple integrals associated with distinct kernel function structures. By introducing additional parameters, the proposed results offer greater flexibility and generality in the formulation and application of these inequalities.

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