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Topic: Is it me or is it Wolfram?
Replies: 16   Last Post: May 13, 2013 4:51 PM

 Messages: [ Previous | Next ]
 JT Posts: 1,448 Registered: 4/7/12
Re: Is it me or is it Wolfram?
Posted: May 10, 2013 3:24 PM

On 10 Maj, 20:04, "Julio Di Egidio" <ju...@diegidio.name> wrote:
> "JT" <jonas.thornv...@gmail.com> wrote in message
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> >http://www.wolframalpha.com/input/?i=0.499999999999999999999999999999...
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> > n = -1.
> > 0.49999999999999999999999999999999999999999 = (n/2-1)/n

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> >http://www.wolframalpha.com/input/?i=%3D%2810000000000000000000000000...
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> > 0.49999999999999999999999999999999999999999=(100000000000000000000000000000000000000000/2-1)/
> > 100000000000000000000000000000000000000000

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> > I do not understand to, can please someone explain why and how wolfram
> > get -1 for the upper calculation, it is obvious using the one below
> > what the solution is?

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> > And if there was two solutions should not Wolfram give them both? What
> > is going on here, i am total newb to math calculators so tell me what
> > is going on?

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> Take the equation k = (n/2-1)/n, and consider that your k is not fitting
> into a float (most probably they are using doubles, i.e. the 64-bit floats,
> but I haven't checked), so k is (apparently) rounded to 0.5.  Then,
> depending on how you transform the equation and the exact step at which you
> substitute your value for k, you either get -Infinity or -1 (exercise left
> to the reader, or I guess you could just check the step-by-step solution,
> but I haven't).
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> That is how floating point works: you'd rather ideally use
> arbitrary-precision rationals, otherwise, as mentioned already in the
> thread, increase the precision of your floating point numbers.  But I do not
> think you can do any of these with Wolfram Alpha.
>
> Julio

No that was not the answer given in any of the primitive math
calculations i did around 97-98, but this is the answer from
mathematica and wolfram.
And just one more thing, for all the prostitutes in mathematics go
fuck yourself.

Date Subject Author
5/9/13 JT
5/9/13 JT
5/9/13 JT
5/10/13 JT
5/10/13 JT
5/10/13 RGVickson@shaw.ca
5/10/13 JT
5/10/13 JT
5/10/13 JT
5/10/13 LudovicoVan
5/10/13 JT
5/10/13 LudovicoVan
5/10/13 JT
5/10/13 JT
5/12/13 JT
5/13/13 JT
5/13/13 Brian Q. Hutchings