The rules for doing theory homework

1. You must do the solution, even if you are getting help
2. It must be handwritten (yes I know some of you will hate that)
   • Handwritten can be either scanned paper or handwritten with a stylus
   • Avoid programs that fix your handwriting
3. Show each step (I know it's hard to know what counts as a step)
4. I'm ok with scribbling out bad/wrong work. Just be clear where.
5. I'm ok with leaving the i=1 to n part off a summation as long as you know what it is
6. You must put notations to the side of what you did in that step
   • MS - Math simplification (basic algebra)
   • BD - By Definition (inserting something defined before)
   • Move sum (moving summation through or grouping summations)
   • Zeros out (things that cancel or equal zero)
   • Add 0 (adding and subtracting the same thing)
   • Times 1 (multiply numerator and denominator by same thing)
   • Rule of Expectations (following predefined rules for E[x])
   • Rule of Variance (following predefined rules for Var[x])
   • X is constant (moving values in/out of E or summation)
   • Independence (Needed to move E/Sum through two variables)

• When moving a summation through an equation put the sum on each term first
• Notice what things are indexed by the sum and what things are not indexed
• For E/Var notice what things are random, and what things are constant