A New Approach to Discrete Integration and Its Implications for Delta Integrable Functions

• Published in: Mathematics (Basel) Vol. 11; no. 18; p. 3872
• Main Authors: Al-Shamiri, Mohammed M., Rexma Sherine, V., Britto Antony Xavier, G., Saraswathi, D., Gerly, T. G., Chellamani, P., Abdalla, Manal Z. M., Avinash, N., Abisha, M.
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01-09-2023
• Subjects: Calculus; closed form; Closed form solutions; Control theory; delta integrable function; discrete integration; Exact solutions; fractional sum; Functional equations; Functions; Functions (mathematics); Identities; Mathematical functions; Mathematics; Newton’s formula; Numerical integration; Polynomials; summation form; Sums; Theorems; Saudi Arabia
• ISSN: 2227-7390; 2227-7390
• DOI: 10.3390/math11183872

This research aims to develop discrete fundamental theorems using a new strategy, known as delta integration method, on a class of delta integrable functions. The νth-fractional sum of a function f has two forms; closed form and summation form. Most authors in the previous literature focused on the summation form rather than developing the closed-form solutions, which is to say that they were more concerned with the summation form. However, finding a solution in a closed form requires less time than in a summation form. This inspires us to develop a new approach, which helps us to find the closed form related to nth-sum for a class of delta integrable functions, that is, functions with both discrete integration and nth-sum. By equating these two forms of delta integrable functions, we arrive at several identities (known as discrete fundamental theorems). Also, by introducing ∞-order delta integrable functions, the discrete integration related to the νth-fractional sum of f can be obtained by applying Newton’s formula. In addition, this concept is extended to h-delta integration and its sum. Our findings are validated via numerical examples. This method will be used to accelerate computer-processing speeds in comparison to summation forms. Finally, our findings are analyzed with outcomes provided of diagrams for geometric, polynomial and falling factorial functions.