Search All of the Math Forum:

Views expressed in these public forums are not endorsed by NCTM or The Math Forum.

Notice: We are no longer accepting new posts, but the forums will continue to be readable.

Topic: sqrt(x) without approximation?
Replies: 17   Last Post: Nov 6, 2015 8:05 PM

 Messages: [ Previous | Next ]
 JT Posts: 1,448 Registered: 4/7/12
Re: sqrt(x) without approximation?
Posted: Feb 10, 2013 2:46 AM

On 10 Feb, 00:32, forbisga...@gmail.com wrote:
> On Saturday, February 9, 2013 1:30:25 PM UTC-8, Virgil wrote:
> > In article
> >  JT <jonas.thornv...@gmail.com> wrote:

> > > Is there always such a base for any N that we can write sqrt(N)
> > > without approximation? Would it matter if we use NyaN or standard
> > > bases.

>
> > No and no!
>
> > While sqrt(N) for nonsquare N, can be approximated in standard
> > notations, I do not see that there can be any analog to digits to the
> > right of a decimal point for your NyaN numbers.

>
> In base sqrt(n), n is expressed as 100.  I'm not sure how to add the
> natural number 1 to a number in a fractional base system where the
> base is > 1.  I would presume that in base 2.5(decimal), 2 + 1 = 10.111...,
> though I'm not quite sure.

What base are you writing 2,5 equal 10.111... you totally lost me
here, can you write out the multiples so i see what is going on?
Since number systems is represenational you can write any decimal on
the form 0,000512 =10^-6*512 this is also true for anybase, so if we
want to write 2,5 in ternary it will be 2,12 since 12 = 5 =1*3+2*1 in
ternary.
And we can use this fact for anybase as long we keep track of the
positional multiple. Ternary base 1,3,9,27,81 and so on.

Date Subject Author
2/9/13 JT
2/9/13 JT
2/9/13 Virgil
2/9/13 forbisgaryg@gmail.com
2/9/13 Virgil
2/9/13 forbisgaryg@gmail.com
2/10/13 JT
2/10/13 forbisgaryg@gmail.com
2/10/13 JT
2/9/13 Wally W.
2/10/13 JT
2/10/13
2/10/13 Virgil
2/10/13
2/10/13
2/10/13 JT
2/10/13 JT
11/6/15 ggarza49@susdgapps.org