# A Universal Ordinary Differential Equation

@article{Bournez2020AUO,
title={A Universal Ordinary Differential Equation},
author={O. Bournez and A. Pouly},
journal={Log. Methods Comput. Sci.},
year={2020},
volume={16}
}
• Published 2020
• Mathematics, Computer Science
• Log. Methods Comput. Sci.
• An astonishing fact was established by Lee A. Rubel (1981): there exists a fixed non-trivial fourth-order polynomial differential algebraic equation (DAE) such that for any positive continuous function $\varphi$ on the reals, and for any positive continuous function $\epsilon(t)$, it has a $\mathcal{C}^\infty$ solution with $| y(t) - \varphi(t) | < \epsilon(t)$ for all $t$. Lee A. Rubel provided an explicit example of such a polynomial DAE. Other examples of universal DAE have later been… CONTINUE READING

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