We're sure you're aware of all of the following, and some of it is repetitious. but just to be sure we're all on the same page with respect to what homework solutions should look like:

**Clarity is important.** One of the main goals (in fact, maybe the
*main goal*) of CSE 311 is to be able to learn how to express
ideas clearly using mathematical formalism.

**You may lose points for style.** Your proofs and explanations
should be clear, well-organized and as concise as possible. It is better to
err on the side of including too many details, however, you should not
belabor things that are completely obvious. Unfortunately, a lot of this is
subjective. Often, students think of proofs as merely either "right" or
"wrong". This would be true if they were expressed in every last detail in a
formal logic but not at the level that you will need to write them here.
Writing a proof is more like writing an essay. Along these lines, if you are
not able to find a complete answer to a problem, you are better off explaining
clearly what you've done rather than faking a proof.

Pictures and *short* pieces of pseudocode can be helpful, but they are
not sufficient. Make sure to label everything. Define all the variables you
use. Make sure you've explained everything clearly in English.

**Try rewriting your proofs.** Writing out your answer fully on a
piece of scratch paper before writing up the version to hand in really does
make a difference. You are more likely to catch mistakes or exceptions, and
your proof will be better organized.

**Set up good notation.** Many of the exercises in the book are phrased
almost entirely in English. It will be your job to rephrase them
mathematically when necessary. The first few lines of many of your proofs
will look something like, "Let *S* be the set of students taking
cse311." Make sure that you've clearly defined any variable you use. Choosing
good names for your variables is also important. For this class, it probably
won't matter too much, but for complicated proofs, it can make a big
difference.

**Collaboration** Homework is individual. It is OK to discuss problems
with a couple of other students but nothing should be recorded from your
discussions and **you must write up
the solutions to each problem set later completely on your own**.

**Extra credit** Homework assignments may have extra credit
problems. Extra credit problems will be scored separately from the
regular problems, and will have relatively little impact on course
grades. The main incentive for doing the extra credit problems is for the
challenge of doing the problems.