Re: Re: Permanent Computation Efficiency

*To*: mathgroup at smc.vnet.net*Subject*: [mg105369] Re: [mg105077] Re: Permanent Computation Efficiency*From*: ?UTF-8?B?5a2Z5oy6?= <sunt05 at mails.tsinghua.edu.cn>*Date*: Mon, 30 Nov 2009 06:09:12 -0500 (EST)*References*: <200911181200.HAA04436@smc.vnet.net> <he372o$err$1@smc.vnet.net>

Thanks all same! The community is so nice:) On Sun, Nov 29, 2009 at 2:39 AM, Leonid Shifrin <lshifr at gmail.com> wrote: > Hi, > > Well, I wouldn't explain it better than Daniel did, and I know far less > about it than he does. Since Coefficient takes derivatives, it does not need > to expand the product, but can use the product formula for derivatives - > this is I guess the reason for its efficiency in this case. > > Regards, > Leonid > > > >> Could you please tell me what combinatorial knowledge is in need to >> understand the function Coefficient? >> >> >

**References**:**Permanent Computation Efficiency***From:*Sunt <sunting.05@gmail.com>