map(SpecialGushelMukaiFourfold) -- associated quadratic map

Synopsis

• Function: map

• Usage:

  map X

• Inputs:
  • X, a special Gushel-Mukai fourfold, containing a surface $S\subset Y$, where $Y\subset\mathbb{P}^8$ is the unique del Pezzo fivefold containing $X$
• Optional inputs:
  • Degree => ..., default value null,
  • DegreeLift => ..., default value null,
  • DegreeMap => ..., default value null,
• Outputs:
  • a rational map, the rational map from $Y$ defined by the linear system of quadrics through $S$