/usr/share/openturns/validation/lambda_U.txt is in openturns-validation 1.5-7build2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | > restart:
> assume(teta,real,theta>0):
> phi:=(-log(t))^theta:
> phiinv:=solve(phi=s,t);
> lambda:=2-2*limit(diff(subs(s=2*s,phiinv),s)/diff(phiinv,s),s=0);
1
phiinv := ----------------
ln(s)
exp(exp(------))
theta~
/ 1 \
|------|
\theta~/
lambda := 2 - 2 2
>
|