About this article
Published Online: Dec 31, 2023
Page range: 309 - 324
Accepted: Dec 18, 2023
DOI: https://doi.org/10.2478/forma-2023-0025
Keywords
© 2023 Noboru Endou et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.
We extend the formalization of the integral theory of one-variable functions for Riemann and Lebesgue integrals, showing that the Lebesgue integral of a continuous function of two variables coincides with the Riemann iterated integral of a projective function.