TRANSLATION BIINVARIANT SUBSPACES OF e_ω~2(Z)

摘要

We consider weights, ω : Z → (0, ∞) satisfyingrn0 < n∈Z inf ω(n+1)/ω(n) ≤ n∈Z sup ω(n+1)/ω(n)< +∞rnand setrne_ω~2(Z) = {u= (u_n)_(n∈Z) ∈ C~N| ‖ u ‖ω= [∑ n+Z |u_n|~2 ω~2 (n)]~(1/2) < +∞}rnS_ω : (u_n)n≥1 → (u_(n-1))_(n≥1) is the usual shift.