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## Homework Statement

Hi all

I have a function f(x), which is:

-1 when x is in the intervals .. (-4;-2), (0;2), (4;6) etc.. and

1 when x is in the intervals ... (-6;-4), (-2;0), (2;4) etc...

At the points -4,-2, 0, 2 .. there are discontinuities.

1) How would I write this function correctly?

2) Is it correct to state that: f(k-) = 1 where k = -6, -2, 2, 6 and f(k+) = 1 where -4, 0, 4 and f(k+) = -1 when k = -6, -2, 2, 6 .. and f(k-) = -1 where k = -4, 0, 4 ... ?