It seems to vary depending on who you ask. The definition of the set of whole numbers always includes the positive integers. However, it may also include zero and possibly the set of negative integers.
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A whole number is defined as a positive integer (i.e., a value with no decimal or fractional part). However, in practice, most people consider negative integers to be whole numbers as well.
but they are not
A negative integer is a whole number but not a natural number.
no, integer is 0 or positive / negative whole number
No, -168 is not a whole number. Whole numbers are non-negative integers, which means they are positive numbers including zero. Since -168 is a negative number, it does not fall within the definition of a whole number.
Any negative whole number is not a natural number - so it is not "the only".
No. You can subtract two whole numbers and get a negative result. Whole numbers can't be negative.