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# Re: Non-linear full-2d writing (again)

From: John Vertical Tuesday, January 31, 2006, 19:20
```tomhchappell wrote:
>If all the symbols are the same size, then, on a plane of zero
>curvature, each symbol can be contiguous simultaneously with at most
>six other symbols; if the curvature is positive (like a sphere), the
>limit is five. To get more than six, you'd need negative curvature
(from another message)
>The problem is that a _regular_, _planar_ graph can't have the
>degrees of all its nodes greater than 6.
>
>A graph is "regular" if every node has just as many connections as
>every other node.
>Tom H.C. in MI
That isn't enuff... A graf of arbitrarily high regular connectivity
(equalling an arbitrarily large negative curvature) can be drawn on a
Euclidean plane, if the nodes are allowed have arbitrary distances from each
another. An easy way to reach a connectivity of m is a series of concentric
circles, with m^n nodes on the nth circle.

These conditions also allow fitting an infinite graf within finite space -
M. C. Escher's Circle Limit series is a good example of this. Similar
examples with hyperbolic grafs probably also exist.

Only if all nodes must be equidistant to all of their neibors (or, in case
of space-filling nodes, of same shape) is 6 the maximum connectivity.

John Vertical
```