A Beurling-Helson type theorem for modulation spaces
A Beurling-Helson type theorem for modulation spaces
复制标题
调制空间的 Beurling-Helson 型定理
DOI:
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发表时间:
2008
期刊:
影响因子:
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通讯作者:
K. Okoudjou
中科院分区:
文献类型:
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作者:
K. Okoudjou
We prove a Beurling-Helson type theorem on modulation spaces.
More precisely, we show that the only ?1 changes of variables that leave invariant
the modulation spaces ℳp,q(ℝd) are affine functions on ℝd. A special case of our
result involving the Sjostrand algebra was considered earlier by A. Boulkhemair.