Theoretical and Natural Science
- The Open Access Proceedings Series for Conferences
Vol. 10, 17 November 2023
* Author to whom correspondence should be addressed.
The definite integral is a fundamental concept in calculus that has many applications in various fields such as physics, engineering, and economics. However, integration can be difficult and requires a variety of skills such as substitutions and partial integration. In this paper, Lobachevsky’s formula is explored, which provides a new way to evaluate definite integrals. It should be noted that Lobachevsky’s formula can only be applied in specific cases where the integrand is even and π-periodic. However, it is demonstrated to be an effective method in these cases. In this paper, the proof of the theorem is given, and a variety of examples are solved by virtue of this method. Hence, this paper may serve as a reference for relevant research in the field of calculus and provide insights into the applications of Lobachevsky’s formula.
Lobachevsky's formula, definite integral, improper integral, calculus
1. Stein E M and Rami S. (2009). Real Analysis. Princeton University Press.
2. Conway J. B. (1995). Functions of one complex variable. Springer-Verlag.
3. Luxemburg W. A. J. (1971). Arzela’s Dominated Convergence Theorem for the Riemann Integral. The American Mathematical Monthly, 78(9): 970–979.
4. Rudin W. (2018). Principles of mathematical analysis. McGraw-Hill Education.
5. Talvila E. (2001). Necessary and Sufficient Conditions for Differentiating under the Integral Sign. The American Mathematical Monthly, 108(6): 544–548.
6. Brown J. W. and Churchill, R. V. (2004). Complex variables and applications. McGraw-Hill Higher Education.
7. Jolany H. (2018). An extension of the Lobachevsky formula. Elemente Der Mathematik, 73(3): 89–94.
8. Folland G. B. (1999). Real analysis : modern techniques and their applications. John Wiley And Sons.
9. GradshteĭnI. S., Ryzhik I. M., Zwillinger D., and Moll V. H. (2014). Table of integrals, series, and products. Academic Press.
10. Abramowitz M. and Stegun I. A. (2012). Handbook of Mathematical Functions. Courier Corporation.
The datasets used and/or analyzed during the current study will be available from the authors upon reasonable request.
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. Authors who publish this series agree to the following terms:
1. Authors retain copyright and grant the series right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgment of the work's authorship and initial publication in this series.
2. Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the series's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgment of its initial publication in this series.
3. Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See Open Access Instruction).