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Delta stands for change, and is commonly represented by dx, dy, ect.
0 is used for origin, or first, while incremental numbers are used for a series or index.
Is there any standard practice abbreviation or symbol for "last", "previous", or "next"?
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I’ve done x0 for first, and x1 for last. Or xi for initial x and xf for final x.
I’ve used x0 from previous, x1 for current and x2 for next as well.
tx for thanks!
I like the idea of xi and xf