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Here are two definitions from a lecture slides file from the internet:

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It looks strange that the first uses x-u and the second uses x-u+1. Are they both correct? I am confused.

Link to file: http://www.inf.ed.ac.uk/teaching/courses/cfcs1/lectures/cfcs_l15.pdf

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    $\begingroup$ The vector definition is probably assuming that indexing starts at $1$ rather than $0$. $\endgroup$ – AnonSubmitter85 Mar 3 '14 at 12:57
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    $\begingroup$ ..., so that the first term $a_1b_1$ gets assigned to $c_1$. Then $a_1b_2+a_2b_1=c_2$ etc. $\endgroup$ – Lutz Lehmann Mar 3 '14 at 13:16

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