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ISSN: 2523-0212 (online) 2616-4906 (Print)
ISSN: 2616-8111 (online) 2616-8103 (Print)
ISSN: 2617-9687 (online) 2617-9679 (Print)
ISSN: 3135-0550 (online) 3135-0542 (Print)
ISSN: 2617-9709 (online) 2617-9695 (Print)
ISSN: 2791-0814 (online) 2791-0806 (Print)
Open Journal of Mathematical Sciences (OMS)
ISSN: 2523-0212 (online) 2616-4906 (Print)
Open Journal of Mathematical Analysis (OMA)
ISSN: 2616-8111 (online) 2616-8103 (Print)
Open Journal of Discrete Applied Mathematics (ODAM)
ISSN: 2617-9687 (online) 2617-9679 (Print)
Ptolemy Journal of Chemistry (PJC)
ISSN: 2618-0758 (online) 2618-074X (Print)
Engineering and Applied Science Letters (EASL)
ISSN: 2617-9709 (online) 2617-9695 (Print)
Trends in Clinical and Medical Sciences (TCMS)
ISSN: 2791-0814 (online) 2791-0806 (Print)
We investigate an inverse source problem for a general linear parabolic equation with space-time dependent coefficients. While the forward operator \(S: f \mapsto u\) is stable and characterized by a smoothing mechanism, its inversion is severely ill-posed. To stabilize the reconstruction of \(f\), we develop a framework based on orthogonal Hilbert-space expansions. By decomposing the evolution equation into an infinite system of ordinary differential equations (ODEs), we explicitly reveal how high-frequency noise is exponentially amplified during the recovery process. A spectral filtering regularization method is proposed, and we establish optimal convergence rates under suitable source conditions.
We establish necessary and sufficient Boas-type criteria for generalized Lipschitz classes associated with the generalized Dunkl transform on the real line. The criteria are expressed through the growth of weighted spectral moments of \(\mathcal{F}_{D}(f)\) as the spectral radius tends to infinity. A symmetric generalized difference generated by the dual translation operators is used; its transform multiplier is \((1-j_{\alpha}(th))^{n}\), which gives the correct order \(2n\) at the origin and the required lower control away from the origin. Direct theorems are proved for the classes \(B_{\gamma}^{n}\) and \(b_{\gamma}^{n}\), while converse theorems are obtained under the standard one-sign condition on the transform. These results identify the precise connection between decay of the generalized Dunkl transform and \(Q\)-weighted smoothness measured by generalized translations.
We introduce the concept of a generalized sequential Yeh-Feynman integral for functionals defined on Yeh-Wiener space, formulated via stochastic process \(Z_h\) associated with a nonzero function \(h\). Existence theorems and evaluation formulas for generalized sequential Yeh-Feynman integral are established for functionals in the Banach algebra \(\hat{\mathcal S}(L_2(Q))\) and some related functionals. Furthermore, we show that the class of generalized sequential Yeh-Feynman integrable functionals is strictly larger than \(\hat{\mathcal S}(L_2(Q))\). Previous results on sequential Yeh-Feynman integral are recovered as corollaries of our results.
This study investigates a generalized fractional Hill differential equation subject to two-point separated homogeneous boundary conditions. First, we formulate the Green’s function and detail its fundamental characteristics. Subsequently, we derive a Lyapunov-type inequality for this specific boundary value problem. The article illustrates that these results encompass several established findings in existing literature as special cases. Finally, the work highlights potential avenues for future study through a series of open problems.
In this article, we present a new Hilbert-type integral inequality involving variable weight functions and an adjustable parameter. It can be described as a generalization of the Mingzhe integral inequality. Some other integral inequalities are also derived. These results provide a flexible framework for obtaining valuable bounds and facilitating further analytical applications.
In this study, we give a new \(m\)-convex function that is called an \(m\)-convex of the second type and its some properties. Moreover, some integral inequalities are examined for each \(m\)-convex function of the second type.
We study finite weighted versions of Cauchy-type inequalities and their relation to the Chebyshev functional. The main elementary device is the reflection of a weighted sequence with respect to its weighted mean. This reflection preserves the total weighted mean and the weighted second mixed moment. We apply the resulting estimates to functions sampled at Fibonacci nodes and to several Fibonacci and Lucas choices of weights and moments.
This paper contributes to the study of weighted semi-norms and their role in integral inequalities, continuing our earlier investigations based on convexity techniques. By incorporating Sonin’s identity into a weighted semi-norm setting, we obtain a unified extension of several classical inequalities of Čebyšev type. The proposed framework allows us to generalize and refine a number of well-known results, including inequalities associated with Čebyšev, Grüss, Ostrowski, and Lupaş, while placing previous contributions by Dragomir and others in a broader weighted context. In particular, we establish new bounds for the weighted Čebyšev functional \(T_w(f,g)\) expressed in terms of the semi-norm \(\Delta_p(f)\), which captures the global oscillatory behavior of the underlying function. Additional improvements are obtained through the use of a weighted Hölder–Işcan type inequality. The resulting theory not only encompasses the classical, unweighted case as a special situation but also offers greater adaptability in problems involving non-uniform weights, probabilistic measures, and weighted approximation processes. As an illustration of applicability, several consequences for numerical integration are discussed, including generalized midpoint and trapezoidal bounds.
Studies on inner-product-type integral transformers have been considered in many research works from various perspectives, including spectra, numerical ranges, and operator inequalities. An open problem remains concerning inequalities related to norm estimates for inner-product-type integral transformers whose spectra are contained in the unit disc. It has been observed that the norms of such transformers can be attained under the condition that one of the implementing operators is normal. In this note, we address this problem by establishing norm inequalities for inner-product-type integral transformers in a general Banach space setting.
This study aims to extend the classical Hermite-Hadamard-type inequalities by employing recently introduced \((k,l)\)-type fractional integrals, which are formulated within the framework of the Riemann-Liouville approach. These integrals are characterized by two exponential parameters, \(k\) and \(l\), defined via the \((k,l)\)-gamma function. In particular, we established new inequalities involving the arithmetic, geometric, and harmonic \((k,l)\)-Riemann-Liouville fractional integrals. Notably, when \(k=l\), these integrals reduce to \(k\)-Riemann-Liouville fractional integrals. Additionally, several foundational identities related to the general \((k,l)\)-Riemann-Liouville fractional integrals are presented. Subsequently, various related inequalities are established using the convexity properties of differentiable functions. These results contribute to the field of fractional calculus and its role in mathematical analysis.
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