ng"></p>
        where <img src="../../../../fig/mpt/modules/solvers/mpt_call_lcp21.png" alt="../../../../fig/mpt/modules/solvers/mpt_call_lcp21.png">, <img src="../../../../fig/mpt/modules/solvers/mpt_call_lcp22.png" alt="../../../../fig/mpt/modules/solvers/mpt_call_lcp22.png"> are index sets corresponding to rows from which submatrices are built. The factored system
        <img src="../../../../fig/mpt/modules/solvers/mpt_call_lcp23.png" alt="../../../../fig/mpt/modules/solvers/mpt_call_lcp23.png"> can b