The Gnumeric manual in html format has some formatting issues: For example for RANDLEVY we see:
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Arguments

c: parameter of the Lévy distribution

@{α}: parameter of the Lévy distribution

@{β}: parameter of the Lévy distribution, defaults to 0
Description

For @{α} = 1, @{β}=0, the Lévy distribution reduces to the Cauchy (or Lorentzian) distribution.

For @{α} = 2, @{β}=0, the Lévy distribution reduces to the normal distribution.
Note

If @{α} ≤ 0 or @{α} > 2, RANDLEVY returns #NUM! If @{β} < -1 or @{β} > 1, RANDLEVY returns #NUM!
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The @ markers around non-ascii characters are apparently not correctly interpreted.