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Pseudo-Riemannian manifold
In
differential geometry
, a
pseudo-Riemannian manifold
(also called a
semi-Riemannian manifold
) is a generalization of a
Riemannian manifold
in which the
metric tensor
need not be
positive-definite
. Instead a weaker condition of
nondegeneracy
is imposed on the metric tensor.
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