Tensor and scalar substitution

I can only do it in tripolar coordinates. note that
the "three-dimensional Navier-Stokes eqaution" has
to be parameterized with time, or "t," but
one doesn't habitually refer to that as a phase-space (or
Minkowski's neologism of "spacetime," which seems
to derive from the general usage of "configuration spaces,"
as with teh foregoing Hamiltonians and Lagrangians.

it's nice to hide behind a whole bunch
of matrix transformations, but, then,
what is to be expected of the aging of some astronaut,
if he were able to make a round trip approaching teh speed
-- not the velocity of corpuscles --
of lightwaves (not "planar waves," which are just
one of those approximations, wheras curvature
is the most impoprtant thing, since Gauss treeted of it
-- and measured the local curvature of Universe,
with his God-am theodolite, for the goment of France.

oops; forgot to shrug,
which is a great exercise if done correctly, and
repeatedly, and strensuosly, like Atlas and
Ayn Remington Rand -- the patron saint
ot typewriting!