On the equatorial Dehn twist of a Lagrangian nodal sphere

Umut Varolgunes

Let $(M^4,\omega )$ be a geometrically bounded symplectic manifold, and $L\subset M$ a Lagrangian nodal sphere such that $\omega {\mid }_{{\pi }_2(M,L)}=0$. We show that an equatorial Dehn twist of $L…