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Re: Re: Re: algebraic numbers

  • To: mathgroup at
  • Subject: [mg106238] Re: [mg106220] Re: [mg106192] Re: algebraic numbers
  • From: Andrzej Kozlowski <akoz at>
  • Date: Wed, 6 Jan 2010 05:57:26 -0500 (EST)
  • References: <> <hhpl0g$9l1$> <> <> <op.u52ai6jwtgfoz2@bobbys-imac.local> <> <op.u529salwtgfoz2@bobbys-imac.local> <> <op.u53a91u1tgfoz2@bobbys-imac.local>

Well, I think when you are using Mathematica it is the designers of 
Mathematica who decide what is rational and what is not.

And when you are not using Mathematica (or other similar software which 
interprets certain computer data as numbers), than I can't imagine what 
you could possibly mean by a "computer number".


On 6 Jan 2010, at 11:45, DrMajorBob wrote:

> Obviously, it DOES make them rational "in a sense"... the sense in 
which I mean it, for example.
> Bobby
> On Tue, 05 Jan 2010 20:41:34 -0600, Andrzej Kozlowski 
<akoz at> wrote:
>> On 6 Jan 2010, at 11:13, DrMajorBob wrote:
>>> I completely understand that Mathematica considers 1.2 Real, not 
Rational... but that's a software design decision, not an objective 
>> I think we are talking cross purposes. You seem to believe (correct 
me if I am wrong) that numbers somehow "exist". Well, I have never seen 
one - and that applies equally to irrational and rationals and even 
(contrary to Kronecker) integers. I do not know what the number 3 looks 
like, nor what 1/3 looks like (I know how we denote them, but that's not 
the sam thing). So I do not think that the notion of "computer numbers" 
makes any sense and hence to say that all computer numbers are rational 
also does not make sense. There are only certain things that we 
interpret as numbers and when we interpret them as rationals they are 
rationals and when we interpret them as non-computable reals than they 
are just that.
>> Of course we know that a computer can only store a finite number of 
such objects at a given time, but that fact in no sense makes them 
>> Andrzej Kozlowski
> --
> DrMajorBob at

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