
<html>

  <head>

    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

  </head>

  <body>

    <p>Thanks for your answer, whereas being 'sad' to me! Do you have

      any idea how the structure FE code geared toward HPC deals with

      their Lagrange multipliers for their BCs? Do they 'accept' that

      cost?</p>

    <p>To my understanding, I didn't know the Sherman-Morrison formula,

      and I am not sure to see how it applies to my case... Could you

      please help me on that?</p>

    <p>Many thanks,<br>

      Olivier  <br>

    </p>

    <blockquote type="cite"

cite="mid:CAMYG4G=BmSE1QOAbWPQL5w439MA-H45Yw3Aw9QoTO_cZNF2rZw@mail.gmail.com">

      <div dir="ltr">

        <div class="gmail_quote">

          <div><br>

          </div>

          <div>I am not sure you can get around this cost. In this case,

            it reduces to the well-known</div>

          <div>Sherman-Morrison formula (<a

              href="https://en.wikipedia.org/wiki/Sherman%E2%80%93Morrison_formula"

              moz-do-not-send="true">https://en.wikipedia.org/wiki/Sherman%E2%80%93Morrison_formula</a>),</div>

          <div>which Woodbury generalized. It seems to have the same

            number of solves.</div>

          <div><br>

          </div>

          <div>  <br>

          </div>

        </div>

      </div>

    </blockquote>

  </body>

</html>