View source for Improper distribution

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The same as a [[Degenerate distribution|degenerate distribution]].

====Comments====
In the West it is unusual to identify the notions of a degenerate distribution and an improper distribution. For the first see [[Degenerate distribution|Degenerate distribution]]; the latter is defined as a [[Measure|measure]] $\mu$ on the Borel sets of $\mathbf R$ such that $\mu(\mathbf R)<1$.