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Only one pair of distinct positive integers satisfy the equation m^n = n^m (keith-mcnulty.medium.com)

526 points by keithmcnulty · 1228 days ago · 157 comments on HN

Article summary

The article discusses the equation m^n = n^m and its solutions for distinct positive integers. One solution is the pair 2 and 4, where 2^4 = 4^2. The article likely explores the uniqueness of this solution. The discussion reveals that the equation has a unique solution for distinct positive integers, excluding cases where n equals m.

Main themes

  • distinct positive integers
  • equation m^n = n^m
  • mathematical rigor
  • graphical analysis
  • derivative functions
  • uniqueness of solutions

What commenters say

  • The equation m^n = n^m has a unique solution for distinct positive integers, which is the pair 2 and 4.
  • The word 'distinct' in the title is crucial, as it excludes solutions where n equals m.
  • The solution is not obvious and requires careful consideration of the equation's properties.
  • The use of the word 'pair' can be misleading, as it may imply order or uniqueness.
  • The article's approach may lack rigor and is more intuitive than analytic.
  • The uniqueness of the solution can be understood through graphical and derivative analysis.
  • The function ln x / x plays a key role in understanding the equation's behavior.
  • The concept of distinctness is essential in mathematics, and assumptions should not be made without clear definitions.