Hello, The next Banach spaces webinar is on Friday May 21 at 9AM Central time. Please join us at https://unt.zoom.us/j/83807914306 Speaker: Hugh Wark (York, England) Title: Equilateral sets in large Banach spaces Abstract: A subset of a Banach space is called equilateral if the distances between any two of its distinct points are the same. In this talk it will be shown that there exist non separable Banach spaces with no uncountable equilateral sets and indeed non separable Banach spaces with no infinite equilateral sets. For more information about the past and future talks, and videos please visit the webinar website http://www.math.unt.edu/~bunyamin/banach