Let R be an integral domain, K its field of fractions, F a free group. Let I and J be fully invariant (=verbal) ideals of the group algebra KF. We prove that over certain domains the equality IJ ∩ RF ...

Transactions of the American Mathematical Society, Vol. 149, No. 2 (Jun., 1970), pp. 503-537 (35 pages) We construct a general class of Banach algebras which include as special cases the group algebra ...

Zearn is an online math curriculum for grades 1 through 5, with supplemental skills practice activities for kindergartners. Students open up to a dashboard with tasks to be completed, which include a ...

Small group math instruction outside of regular class time helped kindergartners in high-poverty schools perform better in math in a study conducted by researchers at the University of Michigan. More ...