On Sun, 07 Oct 2018 14:45:11 -0600, Chris L Peterson
wrote:
On Sun, 7 Oct 2018 13:21:13 -0700 (PDT), Quadibloc

wrote:

On Sunday, October 7, 2018 at 7:58:08 AM UTC-6, Chris L Peterson
wrote:
GR is easy to understand.

For a certain value of "understand". Tensor calculus isn't easy.

Sure. The techniques for manipulating the numbers can be tricky
(although trivially handled by software tools these days). But the
underlying concepts are accessible to anyone with a reasonably
normal
level of intelligence.

You need much more than just the fundamental concepts to successfully
build a theory. The fundamental concept of Newtonian gravity, for
instance, is trivially simple. Yet, even the three-body problem
turned out to be hairy and difficult, not to mention the N-body
problem. Numerical integration handles them all of course, but
numerical integration does not answer the question about the extreme
long-term stability of the system.