Best practice for the notation of conditions in cases: 'if' vs 'for' vs ',' – math.stackexchange.com

Best practice for the notation of conditions in cases: 'if' vs 'for' vs ',' – math.stackexchange.com

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Consider the following three representations of the Kronecker delta function $\delta_{ij}$: $$\delta_{ij} = \begin{cases} 0 &\text{if } i \neq j, \\ 1 &\text{if } i=j. \end{cases}$$ ...

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