<div dir="ltr">From an article by Philip Ball:<div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><span style="color:rgb(26,26,26);font-family:Merriweather,Georgia,serif;font-size:16px">The problem is that Born’s rule was not really more than a smart guess — there was no fundamental reason that led Born to propose it. “It was an intuition without a precise justification,” said </span><a href="https://personal.us.es/adan/home.htm" target="_blank" style="box-sizing:border-box;text-decoration-line:none;color:inherit;font-family:Merriweather,Georgia,serif;font-size:16px">Adán Cabello</a><span style="color:rgb(26,26,26);font-family:Merriweather,Georgia,serif;font-size:16px">, a quantum theorist at the University of Seville in Spain. “But it worked.” And yet for the past 90 years and more, no one has been able to explain why.</span></blockquote><div><br></div><div>Born's rule is that the square of Schrodinger's wave function should be the probability of a quantum particle observation.<br></div><div><br></div><div><a href="https://www.quantamagazine.org/the-born-rule-has-been-derived-from-simple-physical-principles-20190213/">https://www.quantamagazine.org/the-born-rule-has-been-derived-from-simple-physical-principles-20190213/</a></div><div><br></div><div>-- rec --</div><div> </div></div>