Title: On the representation of integers by binary quadratic forms,
Abstract: In this note we show that for a given irreducible binary quadratic form
$f(x,y)$ with integer coefficients, whenever we have $f(x,y) = f(u,v)$ for
integers $x,y,u,v$, there exists a rational automorphism of $f$ which sends
$(x,y)$ to $(u,v)$.