= Reciprocal coordinate at infinite coupling
{title2=$w=1/v$}
An infinite positive coupling coordinate $v$ can be studied through $w=1/v$, with $v=\infty$ represented by $w=0$. For example, $v'=v^4/A(u)$ with $A(u)>0$ becomes $w'=A(u)w^4$, a smooth map at zero. This gives a well-defined boundary <renormalization-group fixed point> whose derivative in the reciprocal direction is zero. One should use this chart rather than substituting infinity into an ordinary finite-coordinate Jacobian.
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