po princip convoluciata na dve uniform e triangle distribution (ili trapecoidno v zavisimost ot support-a im) taka che, se borish za convolucia na 3 uniform - de facto
....i pak google, i eto ti go Lobachevski ot 19-ti vek

Historically, the case of independent and identically uniformly distributed Xis played an
important role, i. e.
X = X1 + · · · + Xn with Xi ∼ U[a; b], i = 1, . . . , n (8)
According to R´enyi [9], p. 198, the distribution of X was first studied by N. I. Lobatchewski
in 1842. ”He wanted to use it to evaluate the error of astronomical measurements, in order
to decide whether the Euclidean or the non-Euclidean geometry is valid in the universe.”

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