Natural numbers under divisibility refer to the set of positive integers starting from 1 and the relation defined by divisibility among these numbers. This relation creates a partial order where one natural number is said to divide another if there exists an integer such that the product of this integer and the first number equals the second. This concept is key in understanding how natural numbers can be compared and arranged based on their divisibility properties, which leads to deeper insights into number theory and algebraic structures.
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