Sigurdur Helgason
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Topologies of group algebras and a theorem of Littlewood
(American Mathematical Society, 1957)An important problem in Fourier analysis is that of investigating the relationship between the "size" of a function and the "size" of its Fourier transform. The present paper can be regarded as a contribution to this problem. 
Response to Steele Prize Award
(American Mathematical Society, 1988) 
Invariant differential equations on homogeneous manifolds
(American Mathematical Society, 1977)