I am using R/Python
diff() operation. e.g., https://docs.scipy.org/doc/numpy-1.14.0/reference/generated/numpy.diff.html
I would like to know if there is a mathematical function that denotes what
In other words, assume I have a list of N numbers. How can I denote this using a methematical function?
mylist = [x1, x2, x2, ..., xN]
I am happy to provide more details if needed.