<div dir="ltr"><div class="gmail_default" style="font-family:monospace,monospace;font-size:small">It seems that there are 2 erratic cut generators here.</div><div class="gmail_default" style="font-family:monospace,monospace;font-size:small"><br></div><div class="gmail_default" style="font-family:monospace,monospace;font-size:small">Running with flow off gomory off the correct solution is produced.</div><div class="gmail_default" style="font-family:monospace,monospace;font-size:small"><br></div><div class="gmail_default" style="font-family:monospace,monospace;font-size:small">If flow covers are on the problem is declared infeasible. </div><div class="gmail_default" style="font-family:monospace,monospace;font-size:small">Gomory cuts activated generate and invalid bound.</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Nov 27, 2017 at 9:54 AM, Haroldo Santos <span dir="ltr"><<a href="mailto:haroldo.santos@gmail.com" target="_blank">haroldo.santos@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_default" style="font-family:monospace,monospace;font-size:small">Hi,</div><div class="gmail_default" style="font-family:monospace,monospace;font-size:small"><br></div><div class="gmail_default" style="font-family:monospace,monospace;font-size:small">Tested with trunk, it appears that this problem is related to cut generators.</div><div class="gmail_default" style="font-family:monospace,monospace;font-size:small"><br></div><div class="gmail_default" style="font-family:monospace,monospace;font-size:small">Running with cuts off the solution with cost 442 is generated, but optimality is not proved as expected because the dual bound is weaker...</div><div class="gmail_default" style="font-family:monospace,monospace;font-size:small"><br></div><div class="gmail_default" style="font-family:monospace,monospace;font-size:small"><br></div></div><div class="gmail_extra"><br><div class="gmail_quote"><div><div class="h5">On Mon, Nov 27, 2017 at 2:49 AM, Gleb Belov <span dir="ltr"><<a href="mailto:gleb.belov@monash.edu" target="_blank">gleb.belov@monash.edu</a>></span> wrote:<br></div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="h5"><div dir="ltr">Hi,<div><br></div><div>on this instance: <a href="https://www.dropbox.com/s/meay5xl4op720l7/dcmst_v20a50d4.mps.gz?dl=0" target="_blank">https://www.dropbox.<wbr>com/s/meay5xl4op720l7/dcmst_v2<wbr>0a50d4.mps.gz?dl=0</a> (68 KB) CBC report optimum 451 while others say 442. Using stable/2.9</div><div><br></div><div>Thank you,</div><div>Gleb<span class="m_-4800933435176567095HOEnZb"><font color="#888888"><br clear="all"><div><br></div>-- <br><div class="m_-4800933435176567095m_-2893988907185491240gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr">Dr Gleb Belov Monash University
<a href="tel:+61%203%209903%201622" value="+61399031622" target="_blank">+61 3 9903 1622</a><br>
</div></div></div></div></div></div></div></div></div></div>
</font></span></div></div>
<br></div></div>______________________________<wbr>_________________<br>
Cbc mailing list<br>
<a href="mailto:Cbc@list.coin-or.org" target="_blank">Cbc@list.coin-or.org</a><br>
<a href="https://list.coin-or.org/mailman/listinfo/cbc" rel="noreferrer" target="_blank">https://list.coin-or.org/mailm<wbr>an/listinfo/cbc</a><br>
<br></blockquote></div><span class="HOEnZb"><font color="#888888"><br><br clear="all"><div><br></div>-- <br><div class="m_-4800933435176567095gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><span style="font-family:monospace,monospace">==============================<wbr>==============================<wbr>=<br>Haroldo Gambini Santos<br>Computing Department<br>Universidade Federal de Ouro Preto - UFOP<br>email: haroldo [at ] <a href="http://iceb.ufop.br" target="_blank">iceb.ufop.br</a><br>home/research page: <a href="http://www.decom.ufop.br/haroldo/" target="_blank">www.decom.ufop.br/haroldo</a><br><br><br>It has long been an axiom of mine that the little things are infinitely<br>the most important.<br> -- Sir Arthur Conan Doyle, "A Case of Identity"<br></span></div></div></div>
</font></span></div>
</blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><span style="font-family:monospace,monospace">=============================================================<br>Haroldo Gambini Santos<br>Computing Department<br>Universidade Federal de Ouro Preto - UFOP<br>email: haroldo [at ] <a href="http://iceb.ufop.br" target="_blank">iceb.ufop.br</a><br>home/research page: <a href="http://www.decom.ufop.br/haroldo/" target="_blank">www.decom.ufop.br/haroldo</a><br><br><br>It has long been an axiom of mine that the little things are infinitely<br>the most important.<br> -- Sir Arthur Conan Doyle, "A Case of Identity"<br></span></div></div></div>
</div>