123 reputation
7
bio website
location
age
visits member for 2 years
seen Nov 19 '13 at 14:38

Jul
2
awarded  Curious
Oct
6
asked Why the Hermite Polynomial $H_{2n+1}$ of $f \in C^{2n+2}[a,b]$, it's g'(t) has (2n + 2) distinct zeros in [a,b]?
Jul
25
comment Could you please explain How to expand $(1 - \frac1x)^{-n}$ into a sum of powers of $x$?
and RonGordon's explicit form helps me get to that conclusion so I accepted his answer.
Jul
25
comment Could you please explain How to expand $(1 - \frac1x)^{-n}$ into a sum of powers of $x$?
@HarishKayarohanam Thanks anyway. But all I want to look for is the form I provide above(in my comment) which appeared in that paper.
Jul
25
comment Could you please explain How to expand $(1 - \frac1x)^{-n}$ into a sum of powers of $x$?
btw the confusing form appeared at nearly the end of page 4 of this paper projecteuclid.org/…
Jul
25
accepted Could you please explain How to expand $(1 - \frac1x)^{-n}$ into a sum of powers of $x$?
Jul
25
comment Could you please explain How to expand $(1 - \frac1x)^{-n}$ into a sum of powers of $x$?
@RonGordon Thanks.
Jul
25
comment Could you please explain How to expand $(1 - \frac1x)^{-n}$ into a sum of powers of $x$?
@RonGordon Just figured it out it is 1 + nC1(1/x) + (n+1)C2(1/x^2) + (n+2)C3(1/x^3) + ...
Jul
25
comment Could you please explain How to expand $(1 - \frac1x)^{-n}$ into a sum of powers of $x$?
How about the - sign is taking out from each coeff e.g. the second coeff is -nC1 etc. Is it possible?
Jul
25
asked Could you please explain How to expand $(1 - \frac1x)^{-n}$ into a sum of powers of $x$?
May
22
accepted What is the mathematical definition of index set?
May
22
asked What is the mathematical definition of index set?
May
18
comment How to calculate the pmf of $X_N$
I think maybe you could show how to get the pmt of N=4 as an example.
May
18
comment How to calculate the pmf of $X_N$
Thank you. But I think what you just did was rewriting my question. Also n is from 0. Means no one getting there own hat.
May
18
revised How to calculate the pmf of $X_N$
edited body; edited title
May
18
comment How to calculate the pmf of $X_N$
Yes, I will change the $X$ to $X_N$, where $X_n$ could integers be from 0 to N.
May
18
comment How to calculate the pmf of $X_N$
Right it should be pmf.
May
18
revised How to calculate the pmf of $X_N$
edited body; edited title
May
18
comment How to calculate the pmf of $X_N$
(Assume everyone got a hat before exchange.)
May
18
asked How to calculate the pmf of $X_N$