Operator zwarty (Polish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Operator zwarty" in Polish language version.

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J.W. Calkin. Two-sided ideals and congruences in the ring of bounded operators in Hilbert space. „Annals of Mathematics”. 42 (4), s. 839–873, Oct. 1941. DOI: 10.2307/1968771. JSTOR: 1968771.
S.A. Argyros, R.G. Haydon. A hereditarily indecomposable ${\mathcal {L}}_{\infty }$ -space that solves the scalar-plus-compact problem. „Acta Mathematica”. 206 (1), s. 1–54, 2011. DOI: 10.1007/s11511-011-0058-y.

J.W. Calkin. Two-sided ideals and congruences in the ring of bounded operators in Hilbert space. „Annals of Mathematics”. 42 (4), s. 839–873, Oct. 1941. DOI: 10.2307/1968771. JSTOR: 1968771.