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[bug #59911] Problem with qagui 1D integrator

From: Yaroslav Nikitenko
Subject: [bug #59911] Problem with qagui 1D integrator
Date: Wed, 10 Mar 2021 15:02:06 -0500 (EST)
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:86.0) Gecko/20100101 Firefox/86.0

Follow-up Comment #1, bug #59911 (project gsl):

cosh(x) dx is d(sh x). If you name that variable u, you have an integral of
exp(-sqrt(1+u^2)). This function seems to better behave at infinity, it
doesn't have accuracy errors because as the previous product of a very large
and very small function.


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