168 reputation
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location Beijing, China
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visits member for 2 years, 1 month
seen Dec 9 at 6:21

Jan
18
comment why have we chosen our number system to be decimal (base 10)
@J.M. Why do you think duodecimal is better? Very curious.
Dec
24
comment Draw graph of $\frac{1}{f(x)}$ from graph of $f(x)$
Ben, thanks very much for such detailed answer and picture!!
Nov
4
comment How to pick a comparison series to determine the convergence or divergence of a given series?
it seems that the 1/n can't work out here.