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The issue of Cauchy's understanding of continuity is a subject of lively historical debate. Grabiner represents only one view in this debate. Laugwitz has published a series of scholarly articles studying the issue. No discussion of this issue is complete without mentioning Cauchy's article dating from 1853 where he deals with convergence of series of functions, and seems to introduce a condition close to uniform convergence which is stronger than one used in his earlier works. See for instance this article.