On Friday, September 22, 2017, 1:38:28 PM PDT, juan <juan.g71@gmail.com> wrote:


On Fri, 22 Sep 2017 19:30:42 +0000 (UTC)
jim bell <jdb10987@yahoo.com> wrote:


>
>> Sometimes somebody gets a new idea.

  >  And the new idea is based on (a lot of) old ideas. At best it's
    a new rearrangement of old elements. Especially in technical
    fields where valid ideas have to stick to physical/mathematical
    principles that are *not* invented, but discovered. 



Here's a brain-teaser:   Is mathematics "discovered" or "invented"?

That's not my question.     http://www.pbs.org/wgbh/nova/blogs/physics/2015/04/great-math-mystery/

              Jim Bell