#### D.15.3.54 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

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