Showing math.GRShow all
2 papers · 1 filter
math.GR2025
Ping-pong for basis-conjugating HNN-extension of free group
Vasily Ionin
We isolate a tractable class of HNN-extensions of a free group, namely, multiple HNN-extensions by basis-conjugating embeddings. For this class, we construct a normal form and esta…
math.GR2025
On injectivity of Cohen-Wu homomorphism
Vasily Ionin
We give a new elementary proof of the theorem that a natural map from Milnor's construction to the simplicial group of pure braids is injective. Our approach…