<div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small;color:rgb(51,51,51)">Ok, I can almost see a connection now. My coworker sent me this stack exchange post:</div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small;color:rgb(51,51,51)"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small;color:rgb(51,51,51)"><a href="https://mathematica.stackexchange.com/questions/91651/nearest-kronecker-product">https://mathematica.stackexchange.com/questions/91651/nearest-kronecker-product</a></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small;color:rgb(51,51,51)"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small;color:rgb(51,51,51)">This led me to this Springer article:</div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small;color:rgb(51,51,51)"><a href="https://link.springer.com/chapter/10.1007%2F978-94-015-8196-7_17">https://link.springer.com/chapter/10.1007%2F978-94-015-8196-7_17</a></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small;color:rgb(51,51,51)"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small;color:rgb(51,51,51)">and this ScienceDirect article:</div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small;color:rgb(51,51,51)"><a href="https://www.sciencedirect.com/science/article/pii/S0377042700003939?via%3Dihub">https://www.sciencedirect.com/science/article/pii/S0377042700003939?via%3Dihub</a><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small;color:rgb(51,51,51)"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small;color:rgb(51,51,51)">I will likely need to dive in a bit more and maybe test the MatLab code against my handworked examples. Thanks again for the pointer.</div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small;color:rgb(51,51,51)"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small;color:rgb(51,51,51)">Also, totally orthogonal to this topic, this paper also came up at work:</div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small;color:rgb(51,51,51)"><a href="https://pubs.acs.org/doi/full/10.1021/acs.jctc.1c00562">https://pubs.acs.org/doi/full/10.1021/acs.jctc.1c00562</a><br></div></div>