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An elementary proof of nonexistence of isometries between $$l^k_p$$ and $$l^k_q$$. (English) Zbl 0424.68026

##### MSC:
 68Q25 Analysis of algorithms and problem complexity 46A45 Sequence spaces (including Köthe sequence spaces) 46B20 Geometry and structure of normed linear spaces
##### Keywords:
isometries between sequences spaces
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