<?xml version="1.0" encoding="UTF-8" standalone="yes"?><oembed><version><![CDATA[1.0]]></version><provider_name><![CDATA[Azimuth]]></provider_name><provider_url><![CDATA[https://johncarlosbaez.wordpress.com]]></provider_url><author_name><![CDATA[John Baez]]></author_name><author_url><![CDATA[https://johncarlosbaez.wordpress.com/author/johncarlosbaez/]]></author_url><title><![CDATA[Quantropy (Part 1)]]></title><type><![CDATA[link]]></type><html><![CDATA[We recover Feynman's sum over histories formulation of quantum mechanics from assuming that all histories have complex amplitudes, that these amplitudes sum to one, and that the amplitudes give a stationary point of 'quantropy' subject to a constraint on the expected action. ]]></html><thumbnail_url><![CDATA[https://i0.wp.com/math.ucr.edu/home/baez/ludwig_boltzmann_and_richard_feynman.jpg?fit=440%2C330]]></thumbnail_url><thumbnail_height><![CDATA[198]]></thumbnail_height><thumbnail_width><![CDATA[325]]></thumbnail_width></oembed>