OOF2: The Manual
Name
Invariant — Invariants of vectors and tensors.
Subclasses
Subclasses are listed as they appear in the GUI and (in parentheses) as they appear in scripts.

Magnitude (
Magnitude
)  Magnitude (L2 or Frobenius norm) of a vector or tensor, absolute value of a scalar. 
Trace (
MatrixTrace
)  Trace of a symmetric tensor. 
Determinant (
Determinant
)  Determinant of a symmetric tensor. 
SecondInvariant (
SecondInvariant
)  Second invariant of a symmetric tensor. 
Deviator (
Deviator
)  Magnitude of deviatoric part of a symmetric tensor. 
Eigenvalue (
Eigenvalue
)  Eigenvalue of a symmetric tensor.
Description
Objects of the Invariant
class are used by
various Output
classes to determine what quantity to compute. Invariants are
quantities, such as the magnitude of a vector or the determinate
of a tensor, that don't depend on a choice of coordinate system.