Vol. 14, No. 5, 2021

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Vol. 14, No. 5, 2021

Universal Gröbner bases of toric ideals of combinatorial neural codes

Melissa Beer, Robert Davis, Thomas Elgin, Matthew Hertel, Kira Laws, Rajinder Mavi, Paula Mercurio and Alexandra Newlon

Uniform subsequential estimates on weakly null sequences

Milena Brixey, Ryan M. Causey and Patrick Frankart

On the coefficients in an asymptotic expansion of $(1+1/x)^x$

T. M. Dunster and Jessica M. Perez

Sums of quaternion squares and a theorem of Watson

Tim Banks, Spencer Hamblen, Tim Sherwin and Sal Wright

Jet graphs

Federico Galetto, Elisabeth Helmick and Molly Walsh

A look at generalized perfect shuffles

Samuel Johnson, Lakshman Manny, Cornelia A. Van Cott and Qiyu Zhang

A real-world Markov chain arising in recreational volleyball

David J. Aldous and Madelyn Cruz

Upper bounds for totally symmetric sets

Kevin Kordek, Lily Qiao Li and Caleb Partin

A note on asymptotic behavior of critical Galton–Watson processes with immigration

Mátyás Barczy, Dániel Bezdány and Gyula Pap

Catalan recursion on externally ordered bases of unit interval positroids

Jan Tracy Camacho and Anastasia Chavez