@@ALGORITHMS FOR HNN-EXTENSIONS

@General discussion@General_hnn-extensions::General discussion@

@Is an HNN-extension free?@General_hnn-extensions::Is an HNN-extension free?

@Is an HNN-extension abelian?@General_hnn-extensions::Is an HNN-extension abelian?@

@Compute the integral homology of an HNN extension@General_hnn-extensions::
Compute the integral homology of an HNN extension@


