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![Cover for N I Achieser · Theorie Der Linearen Operatoren Im Hilbert-Raum - Mathematische Lehrbucher Und Monographien / Abteilung 1. Mathematische Lehrbucher (Hardcover Book) [7th 7., Unveranderte Auflage, Reprint 2025 edition] (1977)](https://imusic.b-cdn.net/images/item/original/145/9783112706145.jpg?n-i-achieser-1977-theorie-der-linearen-operatoren-im-hilbert-raum-mathematische-lehrbucher-und-monographien-abteilung-1-mathematische-lehrbucher-hardcover-book&class=scaled&v=1773415166)
![Cover for N I Achieser · Theorie Der Linearen Operatoren Im Hilbert-Raum - Mathematische Lehrbucher Und Monographien / Abteilung 1. Mathematische Lehrbucher (Hardcover Book) [Reprint 2024 edition] (1975)](https://imusic.b-cdn.net/images/item/original/589/9783112764589.jpg?n-i-achieser-1975-theorie-der-linearen-operatoren-im-hilbert-raum-mathematische-lehrbucher-und-monographien-abteilung-1-mathematische-lehrbucher-hardcover-book&class=scaled&v=1771644713)
![Cover for N I Achieser · Vorlesungen Uber Approximationstheorie - Mathematische Lehrbucher Und Monographien / Abteilung 1. Mathematische Lehrbucher (Hardcover Book) [2nd 2., Verbesserte Auflage, Reprint 2025 edition] (1967)](https://imusic.b-cdn.net/images/item/original/664/9783112706664.jpg?n-i-achieser-1967-vorlesungen-uber-approximationstheorie-mathematische-lehrbucher-und-monographien-abteilung-1-mathematische-lehrbucher-hardcover-book&class=scaled&v=1779925652)