Chris Taylor
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 Jun17 revised Show that $f(x+y)=f(x)+f(y)$ implies $f$ continuous $\Leftrightarrow$ $f$ measurable better title, improved formatting; edited title Jun17 answered Calculate area under a curve Jun16 awarded Mortarboard Jun16 answered What is a “hierarchical random graph”? Jun16 awarded Nice Answer Jun16 answered Why isn't $SA_{\text{cube}} = 3x^2$? Jun16 revised How to normalize a set of real numbers? added 22 characters in body Jun16 answered How to normalize a set of real numbers? Jun16 comment Counting words of varying length made out of a restricted alphabet $n$ is the number of symbols (a, b, c, ...) and $y$ is the maximum word length you are considering. So for symbols (a,b) and words of length two or less, you have $n=2$ and $y=2$. Here $i$ is a dummy variable used for the summation. Jun16 revised Counting words of varying length made out of a restricted alphabet deleted 9 characters in body Jun16 comment Tribonacci sequence modulo X Yes, that is correct. Jun16 comment Tribonacci sequence modulo X Interestingly (in the sense that I wouldn't have guessed this) it appears that $\varphi(m)$, the worst-case run time to calculate the period of the Tribonacci sequence mod $k$ for \$k