Respostas

2014-02-21T00:54:56-03:00
(..., -5,-4,-3,-2,-1,1,2,3,4,5...)
7 4 7
2014-02-21T01:12:27-03:00
Z* = {..., -3, -2, -1, 1, 2, 3,...}
seria isso, se entendi bem sua pergunta
5 4 5