ABSOLUTE VALUE

In the Schwarzschild metric, the important term is S = 1 – 2m/r. I know of no other case where we can write the total solution of a differential eq. as an ABSOLUTE VALUE.  It is such a discontinuity at r=2m, but this is what was
called for !!! Better to have the curve coming back down from + infinity, than jumping down into the basement and coming up !!! We are putting two minus signs into the DETERMINANT, and so not messing up anything.
When you shop at SINGULARITIES-R-US, you’ll find ABSOLUTE VALUE !!!! ¡¡¡¡

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