C.M.S. • Fredericton, NB • June 2010
Meditations on Arens Multiplication
   F.E.J. Linton • Wesleyan Univ. Math/CS Emeritus

  The Argentinian Ignacio Zalduendo had a particularly simple example [1991] (though it relies on that fragment of the Axiom of Choice given by the Hahn-Banach Theorem): start with the convolution algebra A = l¹(Z), multiplication being given by (a • b)_n = _{p, q:}Σ_p+q=n (a_p·b_q ).