Section 3.2 due 9/17

I don't understand the discussion on the zero divisor (or why it is important, rather) because it seems like only a unit would be important. Also, are there zero divisors in rings other than matrices and modular arithmetic?

I really like this section. You can never assume that all functions in a ring are valid--it has to be defined. BUT you can use previously shown axioms to show that things like subtraction work, which is awesome! Everything works out perfectly, which is what we, as mathematicians, want to happen.


Warning: Math joke below.

How does one insult a mathematician?

You say: "Your brain is smaller than any > 0!"