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The Kronecker Delta symbol
The Kronecker delta symbol looks like δij, where i and j are just two integer numbers. Basically, the Kronecker delta is equal to either 1 or 0, depending on whether the numbers i and j are the same or different.| δij | = | { | 1 if i = j 0 if i ≠ j |
So, for example, δ22, δ-1, -1 and δ00 are all equal to 1, but δ12 is equal to zero. It's that simple.
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