Rocksolid Light

News from da outaworlds

mail  files  register  groups  login

Message-ID:  

BOFH excuse #287: Telecommunications is downshifting.


sci / sci.math.research / Interesting Integral

SubjectAuthor
o Interesting Integralapovolot@gmail.com

1
Subject: Interesting Integral
From: apovolot@gmail.com
Newsgroups: sci.math.research
Organization: World Wide Maths
Date: Tue, 18 Apr 2017 22:11 UTC
Path: eternal-september.org!news.eternal-september.org!reader01.eternal-september.org!reader01.eternal-september.org!reader02.eternal-september.org!news.eternal-september.org!news.eternal-september.org!philo.eternal-september.org!.POSTED!not-for-mail
From: apovolot@gmail.com (apovolot@gmail.com)
Newsgroups: sci.math.research
Subject: Interesting Integral
Date: Tue, 18 Apr 2017 16:11:14 -0600
Organization: World Wide Maths
Lines: 15
Sender: edgar@math.ohio-state.edu.invalid
Approved: G A Edgar <edgar@math.ohio-state.edu> moderator for sci.math.research
Message-ID: <180420171611144575%edgar@math.ohio-state.edu.invalid>
Reply-To: "apovolot@gmail.com" <apovolot@gmail.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 8bit
Injection-Info: philo.eternal-september.org; posting-host="b025a0a88a3f5d18d2a9ab045211c707";
logging-data="8205"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX19UtQWN9+hdu04mimOd5ljo"
User-Agent: Thoth/1.9.1 (Mac OS X)
Cancel-Lock: sha1:xbslDQ/Sub46FCki275YN5SpvCs=
X-Original-Date: April 18, 2017 at 11:17:30 AM MDT
View all headers

Per
https://math.stackexchange.com/questions/2230651/a-conjectured-continued-
fraction-for-phi-phi
integrating from 0 to infinity of the function:

e^(-x*(2+(1+sqrt(5))/2))*(cosh(x)+sqrt(5)*sinh(x))^((1+sqrt(5))/2)

is supposed to be:
(phi^phi - 1/phi)/2
where phi =(sqrt(5)+1)/2

Maxima can't find this result symbolically, but numerical integration
gives the expected result.

What about other computer algebra systems?

1

rocksolid light 0.9.8
clearnet tor