Answer:
Double denial results in a statement. In logic when you use a doble denial, it results as an afirmation.
Original sentence: I have nothing.
Negated sentence: I don´t have nothing.
Explanation:
In this sentece the word nothing helps us make the same sense in both sentences. I have nothing has the same meaning as the sentence: I don't have nothing. Both sentences mean the same but one of the has a denial.
Not having nothing is the same thing as having nothing.