<div class="iw_mail" dir="auto" style="font-size: 13px;"><div>Dear QE Developers,</div><div><br></div><div>Hi.</div><div>I noticed that in QE-6.4.1, it is possible to apply an on-site "attraction" (U<0) for Hubbard correction in DFT+U, but in QE-7.1, the code accepts only on-site "repulsion" (U>0). Is there a philosophy behind this change?</div><div>Thanks in advance.</div><div><br></div><div>Best regards,</div><div><br><div>Mahmoud Payami</div><div>NSTRI, AEOI</div><div>Tehran, Iran</div><div>Email: mpayami@aeoi.org.ir</div><div>Phone: +98(0)2182066504</div><div>------------------------------------<br></div></div></div>