Problems: 1) (in
Ban1)
Which Banach algebras
A have
A** commutative?
2) What other symmetric (and closed ?) monoidal categories have interesting dualizing objects
C?
For which is ** symmetric? Or, at least, for which will
commutative monoid
A have
A** commutative?
A topos, and
C = Ω?
AbGp, and
C = the circle group
?