# Proof of principles

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College level proof before real analysis. Please give formal proof.

Please explain each step of your solution.

Prove that the Well-Ordering Principle is equivalent to the Principle of Mathematical Induction

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##### Solution Summary

This is a proof regarding well-ordering principle and principle of mathematical induction.

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Proof:

Well-ordering principle has two phases.

Phase 1: Each nonempty subset of natrual number N contains a smallest element.

Phase 2: To prove that every natural number belongs to a specified set S, assume not, then there is a nonempty subset H

of N that does not belong to S. For this subset H, from phase 1, we have the smallest element k. To make a contradiction,

we need to show that either k belongs to S or ...

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