🚀 go-pugleaf

aa751@cleveland.Freenet.Edu (Fran Rosen) writes:
>
>I now have a conception of the difference between Euclidian and
>non-Euclidian geometry.  What I am curious about is what Calculus
>and Trigonometry show or at least what their purpose is.  

Non-Euclidean geometry is the basis of general relativity. GRT roughly
says that the curvature of space is proportional to the mass in it.

To be more precise: if we define the Riemann tensor as:

                   u    u   n
[\nabla ,\nabla ] T  = R   T ,
       a       b        nab
                                              n
And the Ricci tensor as the contraction: R  =R   ,
                                          ab  anb
                                         1          8\pi K
The field equations of GRT read as: R  - -g  R   = -------- T
                                     ab  2 ab aa     c^2     ab

in which T is the energy-momentum tensor.

>An arts and science major,
>Fran

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