This is an optional input for methods that involve computations on Grassmannians. The argument l can be a list of k+1 distinct integers between 0 and n, corresponding to an affine chart U on the Grassmannian G(k,n). This indicates to the method that should perform internal computations using the chart U. Set this to false (resp. true) to not use any chart (resp. to use a random chart).
The object AffineChartGrass is a symbol.