Online Course Discussion Forum

Help on 6.30 II-A

 
 
Picture of Bober Yang
Help on 6.30 II-A
by Bober Yang - Saturday, 23 January 2021, 3:28 PM
 

I need some hint on the proof


Thanks

 
Picture of Charles Zhang
Re: Help on 6.30 II-A
by Charles Zhang - Saturday, 23 January 2021, 8:25 PM
 
Hint: Try using symmetry to make the summation look a little nicer, and write an equation equal to 0 and try looking back on lecture (or your book) on how to turn it into an equation.  (6.6d, perhaps?)