COMMUTING UNDLATERAL SHIFTS = 0 if » = 0

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one. We would like to thank. Professor R. G. Douglas for suggesting the above problem. Of course, ... for a = ian.n/)El2iZ+2,. X). Then 17 and Vi are commuting.
COMMUTING UNDLATERALSHIFTS JAMES A. DEDDENS1 Abstract. unilateral

Examples

shifts

are given to show that two commuting

(of dimension

oo, » or m, n with

need not commute with a unilateral

2^m,

shift of multiplicity

n