KASH3 Ref - ColumnSubmatrix

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| ### Function ColumnSubmatrix ( elt-alg^mat X, elt-ord^rat i ) -> elt-alg^mat ### Description The submatrix of X consisting of columns i onwards. ### Examples x_ma := MatrixAlgebra(Q,3); x_m := Element(x_ma,[1,2,3,4,5,6,7,8,9]); ColumnSubmatrix(x_m,2); ColumnSubmatrix(x_m,1);
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