I'd like to obtain something like
f11 = function('f11', t,r)
f12 = function('f12', t,r)
f21 = function('f21', t,r)
f22 = function('f22', t,r)
M = matrix(2,2, [[f11, f12], [f21, f22]])
Note that in principle all the functions depend on the same variables.
If the assignation of functions could be used as components of a metric of
sagemanifold, would be even better.
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