a1 Dartmouth College, Department of Mathematics, Hanover, NH 03755, USA, E-mail: firstname.lastname@example.org
a2 Rutgers University, Department of Mathematics, Piscataway, N.J. 08854, USA, E-mail: email@example.com
It is shown that for any cardinal κ, , and if κ is weakly compact then .
(Received August 18 1999)
(Revised November 28 1999)