Notices of the American Mathematical Society

For issues spanning 1954 to 2015, the complete Tables of Contents (TOCs) are fully accessible only by downloading the entire issue in PDF format. From 2016 onwards, the availability and detail of TOCs have significantly improved.

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$\mathcal{R}$ We Living in the Matrix?

Roy Araiza and Rolando de Santiago

Connes’ embedding problem asks if every type II$_1$ factor acting on a separable Hilbert space is embeddable into an ultrapower of the hyperfinite II$_1$ factor via a nonprinciple ultrafilter. Roy Araiza and Rolando de Santiago unravel the meaning behind Connes’ embedding problem and highlight its significance.

Topological Invariants from Higher Categories

Nick Gurski, Niles Johnson and Angélica M. Osorno

While invariants of geometric or topological objects can be of any sort, most modern invariants are algebraic in nature. The goal of this article is to survey some of the ways in which categorical algebra can be utilized to measure topological phenomena.

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