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Omni-MATH / Find all functions f defined on the set of positive reals which take positive real values and satisfy: f(xf(y))=yf(x) for all x,y; and f(x)→0 as x→∞.

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problem

Find all functions ff defined on the set of positive reals which take positive real values and satisfy: f(xf(y))=yf(x)f(xf(y))=yf(x) for all x,yx,y; and f(x)→0f(x)\to0 as x→∞x\to\infty.
Plain-text mathematical notation (without MathML)
Find all functions f defined on the set of positive reals which take positive real values and satisfy: f(xf(y))=yf(x) for all x,y; and f(x)→0 as x→∞.
Original LaTeX notation
Find all functions $f$ defined on the set of positive reals which take positive real values and satisfy: $f(xf(y))=yf(x)$ for all $x,y$; and $f(x)\to0$ as $x\to\infty$.

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