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            <ul>
               <li>[optional] <b>matrix variable bounds treatment</b>, similarly to box constraints on <tt>x</tt> variables, it is possible to change the treatment of constraints on matrix variables <tt>Y</tt>. By default a reciprocal penalty/barrier function is used which might cause that the matrix variables are feasible only up
                  to the given tolerance (see option settings). It is possible to switch some or all of them to logaritmic barrier which secures
          