They are not. 0 (which is a whole number) is not considered a counting number(natural #).
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Yes all counting numbers are whole numbers, but the reverse is not true (zero!)
All counting numbers ARE (not is!) a proper subset of the set of whole numbers.
-3 is a real, rational, whole integer. But then, -- All integers are real rational whole numbers. -- All whole numbers are real rational integers. -- All rational numbers are real. -- All counting numbers are real, rational, whole integers.
No. 0 and negative integers are whole numbers but they are not counting numbers.
Whole numbers include the number 0 and counting numbers do not.