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• CommentRowNumber1.
• CommentAuthorUrs
• CommentTimeJan 19th 2021

fixed notation in the second formula in the proof of this Prop.:

(The adjoined base point $(-)_+$ to the symmetric group factor was previously displayed below the formula beneath the underbrace below the symmetric group symbol that it really belonged to. And in the second line of that formula under the brace, the corresponding $(-)_+$ had been missing.)