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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
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Did you read the description and the reference on wikipedia? We want to express an approximation of exponential(x) as a rational the numerator of which has a given number of digits (more digits, better the approximation). So in first approximation e = exponential(1) is 65/24 with 2 digits in the numerator 65. In a similar manner an approximation of "pi" is 22/7.