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- W3041230244 abstract "We investigate the structure of norm-preserving and linear but not necessarily surjective operators on variable-exponent, discrete Lebesgue spaces. A certain class of isometries, novel to this work, are especially considered; this class completely coincides with all isometries when the Lebesgue space is classical, i.e. of a fixed-exponent. For said isometries it is shown that their actions are completely determined by pairs consisting of set-mappings and bounded functions on $mathbb{N}$. This result recovers the previously-known structure of isometries on fixed-exponent spaces as a special case. In the second part, we show that another wide class of operators, including shift operators, are only isometric under very restrictive conditions on the exponent sequence. Together these results serve to highlight the striking similarities and yet radical differences between isometric operators on fixed- and variable-exponent spaces." @default.
- W3041230244 created "2020-07-16" @default.
- W3041230244 creator A5006790978 @default.
- W3041230244 date "2019-08-07" @default.
- W3041230244 modified "2023-09-27" @default.
- W3041230244 title "Isometric Operators on Variable-Exponent Discrete Lebesgue Spaces" @default.
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