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1 Function: matintersect 2 Section: linear_algebra 3 C-Name: intersect 4 Prototype: GG 5 Help: matintersect(x,y): intersection of the vector spaces whose bases are 6 the columns of x and y. 7 Doc: $x$ and $y$ being two matrices with the same 8 number of rows each of whose columns are independent, finds a basis of the 9 vector space equal to the intersection of the spaces spanned by the 10 columns of $x$ and $y$ respectively. The faster function 11 \tet{idealintersect} can be used to intersect fractional ideals (projective 12 $\Z_K$ modules of rank $1$); the slower but more general function 13 \tet{nfhnf} can be used to intersect general $\Z_K$-modules.