My teacher said that -1/n diverges simply because it is the opposite of the harmonic series 1/n but I was wondering if there were any tests you could do to prove this. I know for -1/n^2 you know it diverges because you can take the absolute value and prove absolute convergence but you can't do that for -1/n. I thought about the integral test which seems to work as -ln(n) diverges but is there a different test I can use? I'm just a little confused about how to approach negative functions. Thanks!