In the mid-19th century, Bernhard Riemann conceived of a new way to think about mathematical spaces, providing the foundation ...

Abstract: In this paper we introduce and study a special class of hybrid automata, Semi-Algebraic Constant Reset hybrid automata (SACoRe). SACoRe automata are an extension of Ominimal semi-algebraic ...

Abstract: Application of sliding-mode control strategies based on (generalized) super-twisting (ST) algorithms in the presence of time- and state-dependent perturbations is highly challenging. One of ...

In light of the recent smartphone ban in secondary schools in Singapore, here's how we used to pass the time in school back ...

Why does cancer sometimes recur even after successful treatment, or why do some bacteria survive despite the use of powerful ...

Julia Kagan is a financial/consumer journalist and former senior editor, personal finance, of Investopedia. Gordon Scott has been an active investor and technical analyst or 20+ years. He is a ...

Dec 7, 2025 There are two ways to stick SU(2) × SU(3) in Spin(10). One is good for physics; the other, alas, is easily obtained using the octonions.