In the univariate case, it is easy to see that if the characteristic function $\phi$ of a $\mathbb R$-random variable $X$ is integrable, then by the inversion theorem the p.d.f $f$ of $X$ is continuous. Does this result still hold for $X$ in $\mathbb R^d$, $d\geq2$ ?
2026-03-27 22:11:29.1774649489
In the multivariate case, does an integrable characteristic function implies a continuous density function?
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