Construction of analytical solutions to systems of two stochastic differential equations

• Published in: Open mathematics (Warsaw, Poland) Vol. 21; no. 1; pp. 108133 - 336
• Main Authors: Navickas, Zenonas, Telksniene, Inga, Telksnys, Tadas, Marcinkevicius, Romas, Ragulskis, Minvydas
• Format: Journal Article
• Language: English
• Published: Warsaw De Gruyter 11-11-2023; De Gruyter Poland
• Subjects: 35R60; 60H10; Differential calculus; differential equation; Differential equations; Exact solutions; Itô equation; Numerical integration; stochastic calculus
• ISSN: 2391-5455; 2391-5455
• DOI: 10.1515/math-2023-0136

A scheme for the stochastization of systems of ordinary differential equations (ODEs) based on Itô calculus is presented in this article. Using the presented techniques, a system of stochastic differential equations (SDEs) can be constructed in such a way that eliminating the stochastic component yields the original system of ODEs. One of the main benefits of this scheme is the ability to construct analytical solutions to SDEs with the use of special vector-valued functions, which significantly differs from the randomization approach, which can only be applied via numerical integration. Moreover, using the presented techniques, a system of ODEs and SDEs can be constructed from a given diffusion function, which governs the uncertainty of a particular process.