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The "axiom of infinity" is a fundamental principle in axiomatic set theory. It asserts the existence of at least one infinite set. This axiom is crucial for developing the theories of real numbers and infinite cardinal numbers within set theory. Without it, mathematicians would be limited to finite sets, which would severely restrict the scope of mathematics. The axiom ensures that there are sets with an infinite number of elements, which are necessary for concepts like the natural numbers (0, 1, 2, 3, ...). This concept of infinity, while abstract, is foundational for many advanced mathematical ideas.123

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