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All integers are rational.
All integers are rational. Not all rational numbers are integers.
All rational numbers are fractional but all fractional numbers are not rational. For example, pi/2 is fractional but not rational.
Not necessarily. All rational numbers are real, not all real numbers are rational.
-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.