Re: 2D


"Gone Fishing" <Gone Fishing@xxxxxxxxxxxx> wrote in message
news:11b0ifjc2if990a@xxxxxxxxxxxxxxxxxxxxx
> Hylander wrote:
> >
> > we know 1D (time) and 3D (space). Is there anything / concept that is
> > 2D? Since 4D is more useful in things like big bang and black holes and
> > coordinates for spacetime curvature in the presence of gravity....does
> > 2D map to anything or describe anything? Perhaps at smaller quantum
> > scales since the coordinates for things at that level are not so clear?
> > Does String Theory deal with this 2D like it does 4D? Is it possible
> > that 10D = 1+2+3+4D? (a second "4D" in there?)
> >
> > John
> > (reading a book on dimensions and another book on the various theories
> > of the universe/big bang/open vs closed/topographics etc.)
>
> Complex numbers are 2D.

Yes and no. Plotted on a plane they can be thought of as 2 d but is the
technical sense as the field over a vector space they are 1 d. It just goes
to show the concept of dimension can itself be rather slippery.

Thanks
Bill


.

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