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August 17, 2012, 01:40:57 AM |
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These are just math terms. k is a variable that represents a number, so that means if k is 3, then kth is 3rd. If k is 5, kth means 5th, etc. d_k represents the amount of the kth deposit. So if k is 5, then d_k is whatever the 5th depositor put in. The underscore is just used to indicate that k is a subscript on d, but that is hard to type in ASCII. These notations aren't really specific to this site, you can find them other places also.
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