Online Course Discussion Forum

Help on 6.30 II-A

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

I need some hint on the proof


Picture of Charles Zhang
Re: Help on 6.30 II-A
by Charles Zhang - Saturday, January 23, 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?)