Re: Grid subgraph prize problems

James Waldby wrote :
Jan Kristian Haugland wrote in sci.math and alt.math.recreational:
... 
http://home.no.net/zamunda/grid.htm

For almost a year, I have been offering small money prizes
for the solutions of selected open problems in the subject
of k-regular induced subgraphs [...] I updated
several cases today, hopefully making them more readable.

On your page http://home.no.net/zamunda/n3k3.htm, what do the question marks mean in defs of v(G1) ... v(G4) ? (Eg, "v(G1) = {(x, y, z) Z3: 2x ? z (mod 4) or 2y ? z - 1 (mod 4)}",
"v(G2) = {(x, y, z) Z3: x + 3y + 5z ? 3 and ? 2, 3, 4 or 6 (mod 7)
or x + 3y + 5z ? 0 and ? 0, 1, 4 or 6 (mod 7)}",
etc.) 

It just means you have a browser problem :
you browser doesn't understand unicode "8801" which is "congruent"

Your browser is told to search this in the "Lucida console" font
It fails to do that.
With both my IE6 and Mozilla + Windows 98, it is ok
What is your browser / operating system ?

Note : presently *No* browser handles unicode/math symbols correctly.
The consequence is that webmasters have to replace all these by images
(as for the "in" symbol on that page) or not be shure if anybody will read
correctly (coding a unicode or symbol font character, as this 8801).
However, a page with hundreds images is not fair either...
and the coding of math symbol characters has to be browser dependent !

BTW could you check your browser against my site's "congruent" symbol,
for instance at http://chephip.free.fr/ie/kcongr.html
(should switch page automatically depending on the browser IE/NS, site is
in French, but doesn't matter for a symbol check).

Regards.

--
philippe
mail : chephip+misc at free dot fr
replace misc by news otherwise message will go to trash

.

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