Do natural numbers contain negatives

Answer 1

No.

The natural numbers (â„•) are defined in 2 ways:

1. the counting numbers {1, 2, 3, ...};
2. The counting numbers and zero, ie {0, 1, 2, 3, ...}

Some definitions include zero, others do not. Either way, negative numbers are NOT included.

The set of Integers (ℤ) is the counting numbers, their negatives and zero, ie {..., -3, -2, -1, 0, 1, 2, 3, ...}