parameterCount X
This function implements a parameter count explained in the paper On some families of Gushel-Mukai fourfolds.
Below, we show that the closure of the locus of GM fourfolds containing a cubic scroll has codimension at most one (hence exactly one) in the moduli space of GM fourfolds.
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The source of this document is in /build/reproducible-path/macaulay2-1.25.06+ds/M2/Macaulay2/packages/SpecialFanoFourfolds.m2:3291:0.