A Question and Answer session will be offered on Thursday 5pm.
We'll meet at the usual classroom: if available we'll use it,
else we move to an available one and leave a note where we are, for latecomers.

Contents covered by the exam:

Know key concepts, definitions, examples for group, ring, field, zero divisor.
I may ask fact knowledge.

From number theory know congruences (definition and properties), the 
ring Z_m of modular arithmetic modulo m and its properties. 
The gcd and the euclidean algorithm in Z. Prime numbers. The Euler
phi function and the theorem that 
     a to the power phi(n) congruent 1 mod n 
provided gcd(a,n)=1. 

Know key definitions and examples about homomorphisms and isomorphisms. 


I may require simple proofs. Simple means that no ingenious idea is required, 
but that the proof is a straightforward and consistent use of the definitions 
and simple conclusions thereof.