AK-invariant, some conjectures, examples and counterexamples
Leonid Grigor'evich Makar-Limanov · Annales Polonici Mathematici · 2001
In my talk I am going to remind you what is the AK-invariant and give examples of its usefulness. I shall also discuss basic conjectures about this invariant and some positive and negative results related to these conjectures.