<html>
  <head>
    <meta content="text/html; charset=windows-1252"
      http-equiv="Content-Type">
  </head>
  <body bgcolor="#FFFFFF" text="#000000">
    <div class="moz-cite-prefix">On page 111 in section 7.1.3 of the
      WIEN2k 16.1 usersguide [
      <a class="moz-txt-link-freetext" href="http://susi.theochem.tuwien.ac.at/reg_user/textbooks/usersguide.pdf">http://susi.theochem.tuwien.ac.at/reg_user/textbooks/usersguide.pdf</a>
      ], there is:<br>
      <br>
      XC_PBE : GGA PBE [Perdew et al., 1996]<br>
      <br>
      That is the article:<br>
      <br>
      J. Perdew, K. Burke, M. Ernzerhof, Generalized Gradient
      Approximation Made Simple, Phys. Rev. Lett. 77, 3865 (1996) [ <span
        class="doi-field"><a class="moz-txt-link-freetext" href="https://doi.org/10.1103/PhysRevLett.77.3865">https://doi.org/10.1103/PhysRevLett.77.3865</a></span>
      ]<br>
      <br>
      It looks like equation 3 and equation 10 in the article is Ec and
      Ex for PBE, respectively.<br>
      <br>
      On 1/14/2017 5:17 AM, Pascal Boulet wrote:<br>
    </div>
    <blockquote
      cite="mid:5EC16F1D-AE6C-4F55-AF5D-47B83CE88B83@univ-amu.fr"
      type="cite">
      <meta http-equiv="Content-Type" content="text/html;
        charset=windows-1252">
      Hello,
      <div><br>
      </div>
      <div>just google « pbe density functional » and you will get the
        reference to the relevant paper. </div>
      <div><br>
      </div>
      <div>Best regards,</div>
      <div>Pascal</div>
      <div><br>
        <div>
          <div>Le 13 janv. 2017 à 19:46, Abderrahmane Reggad <<a
              moz-do-not-send="true" href="mailto:jazairdz@gmail.com">jazairdz@gmail.com</a>>
            a écrit :</div>
          <br class="Apple-interchange-newline">
          <blockquote type="cite">
            <meta http-equiv="Content-Type" content="text/html;
              charset=windows-1252">
            <div dir="ltr">Dear wien developpers
              <div><br>
              </div>
              <div>I need the formulas of the correlation and exchange
                potentials and energies (Pc, Px, Ec and Ex) for the
                functional PBE implemented in the wien2k code .</div>
              <div><br>
              </div>
              <div>Best regards<br clear="all">
                <div><br>
                </div>
                -- <br>
                <div class="gmail_signature"
                  data-smartmail="gmail_signature">
                  <div dir="ltr">
                    <div dir="ltr">
                      <div dir="ltr">
                        <div dir="ltr">
                          <div dir="ltr">
                            <div dir="ltr">
                              <div dir="ltr">
                                <div dir="ltr">
                                  <div dir="ltr">
                                    <div dir="ltr">
                                      <div style="font-family:monospace">
                                        <div><font size="2"><span
                                              style="color:rgb(0,0,255)">Mr:
                                              A.Reggad</span>                                          
                                            <br>
                                            <span
                                              style="background-color:rgb(238,238,238)"><span
                                                style="color:blue">Laboratoire
                                                de Génie Physique</span></span><br>
                                          </font></div>
                                        <font size="2"><span
                                            style="color:rgb(0,0,255)">Université
                                            Ibn Khaldoun - Tiaret</span><br>
                                        </font></div>
                                      <div style="font-family:monospace"><font
                                          color="#0000ff" size="2">Adresse:
                                          BP 144 AL ATTAF AIN DEFLA <br>
                                        </font></div>
                                      <div style="font-family:monospace"><font
                                          color="#0000ff" size="2">Tel:
                                          +213(0)561861963</font></div>
                                      <div><font size="2"><span
                                            style="font-family:monospace"><span
                                              style="color:rgb(0,0,255)">Algerie</span></span></font><br>
                                      </div>
                                    </div>
                                  </div>
                                </div>
                              </div>
                            </div>
                          </div>
                        </div>
                      </div>
                    </div>
                  </div>
                </div>
              </div>
            </div>
          </blockquote>
        </div>
      </div>
    </blockquote>
  </body>
</html>