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Remove a term from a quadratic expression.

 void remove ( int i )

Remove the quadratic term stored at index i of the expression.

Arguments:

i: The index of the quadratic term to be removed.

 boolean remove ( GRBVar var )

Remove all quadratic terms associated with variable var from the expression.

Arguments:

var: The variable whose quadratic term should be removed.

Return value:

Returns true if the variable appeared in the quadratic expression (and was removed).