Re: Taking LCM in a polynomial expression

*To*: mathgroup at smc.vnet.net*Subject*: [mg95336] Re: Taking LCM in a polynomial expression*From*: Bill Rowe <readnews at sbcglobal.net>*Date*: Fri, 16 Jan 2009 06:06:54 -0500 (EST)

On 1/15/09 at 6:13 AM, skt at xdtech.com (Srikanth) wrote: >Hi I have a symbolic matrix that I invert. When I take each >individual entry of the resulting matrix, I get an expression of the >form: num1/den1 + num2/den1 + .... + num_n/den1 where den1 is the >determinant of the matrix. I'd like to get an expression of the >form: Num/Den. Use Together. For example, In[2]:= expr = Plus @@ Table[n/x^n, {n, 3}] Out[2]= 3/x^3+2/x^2+1/x In[5]:= Together[expr] // TraditionalForm Out[5]//TraditionalForm= (x^2+2 x+3)/x^3