isRankAtLeast(n1, M1)
This function tries to quickly determine whether the matrix has a given rank. isRankAtLeast calls getSubmatrixOfRank. If that function finds a submatrix of a certain rank, this returns true. If that function fails to find a submatrix of a certain rank, this simply calls rank. To control the number of times getSubmatrixOfRank considers submatrices, use the option MaxMinors.
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The option Threads can be used allow the function use multiple threads of execution. If allowableThreads is above 2 and Threads is set above 1, then this function will try to simultaneously compute the rank of the matrix while looking for a submatrix of a certain rank.
The object isRankAtLeast is a method function with options.