1.4, due on September 12

Difficult:
I had a hard time understanding the reindexing based on changing the order of summation. I understand changing the order of summation when the range over which you sum is fixed. But when one set of indices depends on another variable you iterate over, I have a hard time understanding how that transfer of indices works.

Reflective:
I thought the trick (technique?) of using change of variables to get a difficult-to-sum-over expression in the form of a familiar expression was great. That will be very useful for putting difficult expressions in terms of expressions that we know how to sum over.

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