M-ideals and quasi-triangular algebras

zbMath0591.47032MaRDI QIDQ1074841

Timothy G. Feeman

Publication date: 1987

Published in: Illinois Journal of Mathematics (Search for Journal in Brave)

Full work available at URL: https://projecteuclid.org/euclid.ijm/1255989404

zbMATH Keywords

approximation properties of M-idealsexistence and non-uniqueness of best quasi-triangular approximantslinearly ordered set of projections on a Hilbert spacequasi-triangular algebra

Mathematics Subject Classification ID

Best approximation, Chebyshev systems (41A50) Abstract operator algebras on Hilbert spaces (47L30) Uniqueness of best approximation (41A52)