Anderson, Joel A \(C^*\)-algebra \(\mathcal A\) for which Ext (\(\mathcal A\)) is not a group. (English) Zbl 0363.46053 Ann. Math. (2) 107, 455-458 (1978). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 1 ReviewCited in 1 Document MSC: 46L05 General theory of \(C^*\)-algebras 18G15 Ext and Tor, generalizations, Künneth formula (category-theoretic aspects) PDF BibTeX XML Cite \textit{J. Anderson}, Ann. Math. (2) 107, 455--458 (1978; Zbl 0363.46053) Full Text: DOI