
Advanced Engineering Mathematics
10th Edition
ISBN: 9780470458365
Author: Erwin Kreyszig
Publisher: Wiley, John & Sons, Incorporated
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General Tensor
(3.22) definition to solve in the other image

Transcribed Image Text:Prove that the permutation symbol (e) defines a Cartesian tensor in R². It is assumed
that e; is defined in the same way in every rectangular coordinate system.
If the change of coordinates is x₁ = a₁x₁, where (a) (a) = (Spg) and
|a₁|= 9₁1 922 912921 = 1
we have to establish the Cartesian tensor law (3.22)
ēj=ersair a js
Let's examine separately the four possible cases:
i=j=1
i=1, j = 2
i=2, j = 1
i=j=2
(n = 2)
e9₁a1s = a11912
912911 = 0 =ē11
e,,a1ra28 = a₁1922
912921 = 1 = 12
e,a2ra 18 =a21a12-a22911 = -1 = ²21
ersa₂, a28 = a21922-a22921 = 0 = ²22

Transcribed Image Text:A surprising fact is that now covariant and contravariant behaviors are
identical. Consequently, all Cartesian tensors will be denoted with subscripts:
allowable coordinate changes ;=A₁jXj ○ x₁ = AjjXj
cartesian tensor laws
T₁ = air Tr Tij = air a js Trs, ...
38
Since an orthogonal transformation converts another rectangular coordinate system into a rectangular
one (with the same origin), Cartesian tensors are associated with rectangular (Cartesian) coordinate
systems. There are of course more Cartesian tensors than affine ones.
Note that JJT = I implies ² = 1₁, or = +1. Objects that obey the laws
tensorial (3.22) when the allowable changes in coordinates are such that
J = |a₁|= +1
(3.22)
They are called proper Cartesian tensors.
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