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4.6.5 intmat related functions
betti- Betti numbers of a free resolution (see betti)
det- determinant (see det)
ncols- number of cols (see ncols)
nrows- number of rows (see nrows)
random- pseudo random intmat (see random)
size- total number of entries (see size)
transpose- transpose of an intmat (see transpose)
trace- trace of an intmat (see trace)