The real plane Cremona group is a non-trivial amalgam
Algebraic Geometry
2019-12-03 v5
Abstract
We show that the real Cremona group of the plane is a non-trivial amalgam of two groups amalgamated along their intersection and give an alternative proof of its abelianisation.
Cite
@article{arxiv.1705.07500,
title = {The real plane Cremona group is a non-trivial amalgam},
author = {Susanna Zimmermann},
journal= {arXiv preprint arXiv:1705.07500},
year = {2019}
}