For equally spaced data, the forward difference is defined by \Delta f_i=f_{i+1}-f_i. If f_i=5 and f_{i+1}=8 , what is \Delta f_i ?

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For equally spaced data, the forward difference is defined by

$\Delta f_i=f_{i+1}-f_i.$ \Delta f_i=f_{i+1}-f_i. If

f_i=5 and $f_{i+1}=8$ f_{i+1}=8, what is $\Delta f_i$ \Delta f_i?

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