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$$x^{y}=y^{x}$$

## Solutions of x^y=y^x

http://planetmath.org/SolutionsOfXyYx
The equation xy=yx (1) has trivial solutions on the line  y=x.  For other solutions one has the Theorem.  1∘. The only positive solutions of the equation (1) with  1<x<y  are in a parametric form x=(1+u)1u,y=(1+u)1u+1 (2) where  u>0. 2∘. The only rational solutions of (1) are x=(1+1n)n,y=(1+1n)n+1 (3) where  n=1, 2, 3,… 3∘. Consequently, the only integer solution of (1) is 24= 16= 42. Proof. 1∘...
$$x^{y}=y^{x}$$

## Topic entry on rational numbers

http://planetmath.org/TopicEntryOnRationalNumbers
rational number • fraction Properties • commensurable numbers • rational algebraic integers Forms • partial fractions • any rational number is a sum of unit fractions • Egyptian fractions • mixed fraction • decimal fraction • decimal expansion • order valuation • continued fraction Where are rational numbers? • rational points on one dimensional sphere •...
$$x^{y}=y^{x}$$

## Catalan’s conjecture

http://planetmath.org/CatalansConjecture
The successive positive integers 8 and 9 are integer powers of positive integers (23 and 32), with exponents greater than 1. Catalan’s conjecture (1844) said that there are no other such successive positive integers, i.e. that the only integer solution of the Diophantine equation xm-yn=1 with  x>1,  y>1,  m>1,  n>1  is x=n=3,y=m=2. It took more than 150 years before the conjecture was proven. Mihailescu gave i...
$$x^y=y^x$$

## Equation xʸ=yˣ

https://en.wikipedia.org/wiki/Equation_xʸ=yˣ
In general, exponentiation fails to be commutative. However, the equation x^y=y^x holds in special cases, such as x=2, y=4. The equation x^y=y^x is mentioned in a letter of Bernoulli to Goldbach (29 June 1728). The letter contains a statement that when x\ne y, the only solutions in natural numbers are (2,4) and (4,2), although there are infinitely many solutions in rational numbers. The reply by Goldbach (31 January 1729) contains gener...
$$x^y=y^x$$

## Solve $x^y \, = \, y^x$ - Answer 2

https://math.stackexchange.com/questions/114476
Possible Duplicate: $x^y = y^x$ for integers $x$ and $y$ I obtained a question asking for how to solve $\large x^y = y^x$. The given restraints was that $x$ and $y$ were both positive integers. By a bit of error an trial we quickly see that $x=2$ and $y=4$ is one solution. My question is: How do one show that $(2\,,\,4)$ is the only non trivial, positive solution to the equation?&...
$$x^y=y^x$$

## Find the distribution and and density functions of $Y=\ln(x)$ - Answer 1

https://math.stackexchange.com/questions/205595