- Tell us Isbell's Zigzag Lemma, and give some examples. (Rhodes)
- Prove the undecidability of the word problems for semigroups. (Rhodes)
- Tell us about Lagrange Coordinates on Groups. (Rhodes)
- Classify up to isomorphism all semigroups of order 3. (Rhodes)
- Prove all finite semigroups are stable.
- Prove all torsion semigroups and all finite J-above semigroups are stable.
- Prove that stable implies J = D.
- Can you think of a semigroup for which J = D but which is not stable?
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