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D.5.2.56 partUnder

Procedure from library chern.lib (see chern_lib).

Usage:
partUnder(J); J list of integers (partition)

Return:
list of lists

Purpose:
computes the partitions under a given one

Note:

Example:
 
LIB "chern.lib";
// Partitions under the partition (0, 1, 1)
list I = 0, 1, 1;
print( partUnder(I) );
==> [1]:
==>    [1]:
==>       0
==>    [2]:
==>       0
==>    [3]:
==>       0
==> [2]:
==>    [1]:
==>       0
==>    [2]:
==>       0
==>    [3]:
==>       1
==> [3]:
==>    [1]:
==>       0
==>    [2]:
==>       1
==>    [3]:
==>       1