3.23 (b) Components of  (1. Diagonal Element)

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 Consider two differential elements  deformed from .

Since

For example, if  the original element is  deformed to  then

Thus  represents the ratio of the square of  the deformed element with respect to an element originally lying along the x-axis.

Next:  3.23 (c) Components of   (2. Off-Diagonal Element)

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