Im Bier, Beweis
30 November, 2011
(though wine may be needed for truth)
Worked out last night over a quiet pint:
Consequently: if ,
and
lie in a commutative Banach algebra, and
,
,
and
all have norm
, then the expression on the left hand side has norm at most
.
[Title corrected 2011-12-08]
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