In the post
http://lists.gnu.org/archive/html/help-glpk/2007-06/msg00051.html
there is a minor error.
The constraint
s.t. phi{i in I}: sum{j in J} x[i,j] = 1;
/* each agent must be assigned exactly one task */
should be replaced by the following constraint
s.t. phi{i in I}: sum{j in J} x[i,j] <= 1;
/* each agent can perform at most one task */
to allow the case m > n, i.e. when the number of agents is greater than
the number of tasks.
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