Congruence Transformation
A transformation of the form g=D^(T)etaD, where det(D)!=0 and det(D) is the determinant. Isometries are also called congruence transformations.
See also
Congruent, Geometric Congruence, Isometry, Sylvester's Inertia LawExplore with Wolfram|Alpha
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Cite this as:
Weisstein, Eric W. "Congruence Transformation." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/CongruenceTransformation.html