Symplectic singularity of curves with semigroups (4,5,6,7), (4,5,6) and   (4,5,7)
  We study the local symplectic algebra of curves with semigroups $(4,5,6,7)$, $(4,5,6)$ and $(4,5,7)$. We use the method of algebraic restrictions to parameterized curves as in \cite{D1}. A new discrete invariant for algebraic restrictions to parameterized quasi-homogeneous curves is introduced. This invariant together with the method of algebraic restriction can distinguish different symplectic orbits of quasi-homogeneous curves. 
Fausto Assun\c{c}\~ao de Brito Lira, Wojciech Domitrz, Roberta Wik   Atique
math.AG