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Science 13 June 1980:
Vol. 208. no. 4449, p. 1212
DOI: 10.1126/science.208.4449.1212-b
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Erratum

In the letter from J. Alperin and S. Mac Lane (6 June, p. 1088), reference was made to a "group therapy seminar" held at the University of Chicago on 6 May. The text should have read "group theory seminar."

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Science. ISSN 0036-8075 (print), 1095-9203 (online)