منابع مشابه
On Operator-valued Cosine Sequences on Umd Spaces
A two-sided sequence (cn)n∈Z with values in a complex unital Banach algebra is a cosine sequence if it satisfies cn+m + cn−m = 2cncm for any n,m ∈ Z with c0 equal to the unity of the algebra. A cosine sequence (cn)n∈Z is bounded if supn∈Z ‖cn‖ < ∞. A (bounded) group decomposition for a cosine sequence c = (cn)n∈Z is a representation of c as cn = (b n +b−n)/2 for every n ∈ Z, where b is an inver...
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ژورنال
عنوان ژورنال: Journal of Functional Analysis
سال: 1986
ISSN: 0022-1236
DOI: 10.1016/0022-1236(86)90082-0