/sci/ - Science & Math

This has to be a typo in my math book
>find the Fourier series
>a) f(x)=-x, -1<x<1; T=2

T implies period. There's no way the period can be only 2 here? It has to be twice that to make sense with that interval, right? I found a similar task as an example in a different book where it's k instead of -x, and there the period is 4 while L(half period) is 2