synopsis: INT decp_mat(OP n,OP p,OP dmat)


computes the decomposition matrix to the symmetric group Sn of degree n for the prime p. The result is the MATRIX object dmat. The routine first looks for the file decommix.dat in the actual directory. This file is generated during a previous run of the routine decp_mat. So if the values are already stored in this file you get an imediate answer. Problems arise if the data in this file is corrupted because of errors in previous runs. So to get the programm working correctly you have to remove this file decommix.dat

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