http://www.mapleprimes.com/questions/132081-Why-Is-Not-The-Coefficient-Nonzero en-us 2026 Maplesoft, A Division of Waterloo Maple Inc. Maplesoft Document System Sat, 13 Jun 2026 21:09:53 GMT Sat, 13 Jun 2026 21:09:53 GMT The latest answers and comments added to the Question, Why is not the coefficient non-zero? http://www.mapleprimes.com/images/mapleprimeswhite.jpg http://www.mapleprimes.com/questions/132081-Why-Is-Not-The-Coefficient-Nonzero http://www.mapleprimes.com/questions/132081-Why-Is-Not-The-Coefficient-Nonzero?ref=Feed:MaplePrimes:Why is not the coefficient non-zero?:Comments#answer132093 <pre>W:=add((k^(2*i))*add((e^(j))*w[i,j](r,t),j=0..2),i=0..2):<br>P:=add((k^(2*i+1))*add((e^(j))*w[i,j](r,t),j=0..2),i=0..2):<br>expand((k/(2*r))*(diff(W,r)*diff(P,t)-diff(W,t)*diff(P,r)));</pre> <p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0<br><br></p> <pre>W:=add((k^(2*i))*add((e^(j))*w[i,j](r,t),j=0..2),i=0..2):<br>P:=add((k^(2*i+1))*add((e^(j))*w[i,j](r,t),j=0..2),i=0..2):<br>expand((k/(2*r))*(diff(W,r)*diff(P,t)-diff(W,t)*diff(P,r)));</pre> <p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0<br><br></p> 132093 Sun, 25 Mar 2012 09:47:06 Z Joe Riel Joe Riel