Given a tuple e=(x,y), how do I reference the 2nd item (y)?
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I figured I would collect a number of the comments together into an answer so you would have something to accept (citing, so no one would hate on me for an plagiarism).
As with many types of mathematical notations, there are a number of possible variations here.
Just be sure you explain to the reader what you mean by the notation—don't assume he will understand (GEdgar).