Abstract
In this review, a pedagogical introduction to the concepts of slow-roll inflationary universe and number of e-folds is provided. In particular, the difference between the basic notion of e-folds (Ne) the total number of e-folds (NT) and the number of e-folds before the end of inflation (N) is outlined. The proper application of the number of e-folds before the end of inflation is discussed both as a time-like variable for the scalar field evolution and as a key parameter for computing inflationary predictions.
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