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math.GR2025
Growth and Language Complexity of Potentially Positive Elements of Free Groups
Emma Dinowitz, Lucy Koch-Hyde, Siobhan O'Connor +1
A word in a free group is called ``potentially positive'' if it is automorphic to an element which is written with only positive exponents. We will develop automata to analyze prop…
math.GR2025
Orbit-blocking words in free groups
Lucy Koch-Hyde, Siobhan O'Connor, Eamonn Olive +1
By strengthening known results about primitivity-blocking words in free groups, we prove that for any nontrivial element w of a free group of finite rank, there are words that cann…