Nothing
`cusp.inflexions` <-
function (alpha, beta)
{
roots <- polyroot(c(beta + alpha^2, 2 * alpha * beta, beta^2 -
3, -2 * alpha, -2 * beta, 0, 1))
real <- abs(Im(roots)) < .Machine$double.eps^0.5
if (all(real))
sort(Re(roots))
else rep(Re(roots[real]), 1)
}
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