<html><head><meta http-equiv="content-type" content="text/html; charset=us-ascii"></head><body style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;">Dear, <div><br></div><div>We are developing novel subspace methods to deal with inequality bounds on the variables. </div><div>ResQPASS, short for Residual Quadratic programming active set Subspace method, behaves asymptotically as a Krylov subspace. The paper is published in SISC and is available in <a href="https://urldefense.us/v3/__https://arxiv.org/abs/2302.13616__;!!G_uCfscf7eWS!bnM-6GCLUYnx_bcmKoE5yD6ehhfMLkUeEB7g_LRq0OMhvkWuwolEBu_gw8jdqo-VxP43j8InK6Eb6X6U9g$">https://arxiv.org/abs/2302.13616</a>. </div><div><br></div><div>In the past we contributed several pipelined methods in KSP. But the current methods might also be of value for large scale optimization problems. We believe that the method will be very useful for contact problems and variational inequalities that model interacting mechanical systems. </div><div><br></div><div>Who should I contact to discuss the best strategy to add the solver?</div><div><br></div><div>Wim Vanroose</div></body></html>