Derivation of the ε-δ identity [ε-δ等式的推导]

The ε-δ identity (ε-δ等式), one of the most frequently used identity in solid mechanics. Here is a simple derivation of  the ε-δ identity.

Step 1~2:

Step 3:

Step 4:

Step 5:

Step 6:

Step 7:

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