I don't understand this but it is beautiful, and I wish I could step into this world. https://johncarlosbaez.wordpress.com/2020/06/29/noethers-theorem-2/amp/?__twitter_impression=true -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://redfish.com/pipermail/friam_redfish.com/attachments/20200630/5aa4821e/attachment.html>