The inclusion of the Schur algebra in B(l²) is not inverse-closed
classification
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algebraschurboundedinftyinverse-closedconjectureconjectureddisprove
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The Schur algebra is the algebra of operators which are bounded on l^1 and on l^{\infty}. Q. Sun conjectured that the Schur algebra is inverse-closed. In this note, we disprove this conjecture. Precisely, we exhibit an operator in the Schur algebra, invertible in l^2, whose inverse is not bounded on l^1 nor on l^{\infty}.
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