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Mathematical induction （数学的帰納法）
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8 Equivalence with the well-ordering principle
Equivalence with the well-ordering principle
The principle of mathematical induction is usually stated as an axiom of the natural numbers; see Peano axioms. However, it can be proved from the well-ordering principle.
It can also be proved that induction, given the other axioms, implies the well-ordering principle.（整列原理）
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Well-ordering principle （整列原理）
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In mathematics, the well-ordering principle states that every non-empty set of positive integers contains a least element.[1]
In other words, the set of positive integers is well-ordered by its "natural" or "magnitude" order in which x precedes y if and only if y is either x or the sum of x and some positive integer (other orderings include the ordering 2, 4, 6, ..., 1, 3, 5, ...).
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整列集合
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自然数全体の成す集合 N が通常の大小関係 "<" に関して整列集合となるという事実は、一般に整列原理と呼ばれる。
(引用終り)
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