I am not sure if this is the topic to cite my query.Anyway,

I have to find the 1-norm,2-norm and the ∞- norm of any discrete-time ﬁnite-duration complex exponential

φk = e^(2πj kn/N) , for any k = 0, . . . , N − 1.

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I found the 2-norm but I have not understand well the 1-norm and particularly the infinite norm.. Is it true that the 1-norm is equal to the sum of the absolute value of a discrete signal (x(n)), for n=0 to N-1 ?

Could someone give me a help here?How do I find the norms of φk ?

thanks in advance..