Re: Re: Some bugs in Mathematica
- To: mathgroup at smc.vnet.net
- Subject: [mg59410] Re: [mg59395] Re: Some bugs in Mathematica
- From: Daniel Lichtblau <danl at wolfram.com>
- Date: Tue, 9 Aug 2005 03:30:42 -0400 (EDT)
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- Sender: owner-wri-mathgroup at wolfram.com
akhmel at hotmail.com wrote: > Regretfully, you mistyped the expression for the antiderivative and > therefore, when you tried to do the differentiation, it didn't work. > > The correct expression is: > > 1/(a*b)*ArcTanh[(b*Sqrt[r^2 - a^2]) / (a*Sqrt[r^2 - b*2])] The original was laced with both forward and backward slashes. I mistook one to be a line continuation rather than a division. As I have noted in past, use of Mathematica InputForm would avoid such ambiguity. > In order to avoid misunderstanding, I describe the argument of ArcTanh > verbally: it is a fraction. [...] > What is your position within Wolfram Research? Are you in charge of > public relation? I have worked in the Kernel Development Group (under various different names) since 1991. I do not know if it was intended, but I have a feeling people at WRI who read your question will find it quite funny. I gather you once worked at DayJet? What is it you do nowadays, there or elsewhere? From the queries I have seen regarding symbolic integrals I would venture to guess it is not optimization in flight/crew scheduling? Regardless, you now know what it is I do and I think a response to this, in private email if you prefer, is in order. > Sincerely, > > Alex > [...] Daniel Lichtblau Wolfram Research
- References:
- Some bugs in Mathematica
- From: akhmel@hotmail.com
- Re: Some bugs in Mathematica
- From: akhmel@hotmail.com
- Some bugs in Mathematica