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Tag Archives: GAP
Microsoft buys GitHub?
Some years ago, it was announced that Microsoft had done a deal with Donald Knuth and the American Mathematical Society and had bought the rights to TeX. It was slightly worrying until you noticed that the announcement was dated 1 … Continue reading
More groups
The title reminds me of the occasion when my academic grandfather lectured to the London Mathematical Society on “Moore graphs”. Unfortunately, someone got it wrong, and his lecture was billed as “More graphs”. But here I really do mean what … Continue reading
Computer blues
No, not a grumble: a story with a happy ending. Back in 2008, when the Asus eee-pc notebook came out, I got one of the first. I have written elsewhere about how it was indispensible on my Forder tour of … Continue reading
Posted in Uncategorized
Tagged Acer, Asus, Blue Anteater, Dropbox, GAP, laptop computer, notebook computer, TeX
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A symmetric design
Quite a long time ago, Arunas Rudvalis discovered a symmetric 2-(14080,1444,148) design: a set of 14080 points, with 14080 subsets of size 1444 called blocks, with the property that any point lies in 1444 blocks, any two points in 148 … Continue reading
Posted in doing mathematics, exposition
Tagged Arunas Rudvalis, Cheryl Praeger, GAP, Symmetric design
2 Comments
A cliff
The “combinatorial explosion” is a well-known phenomenon. I recently came across a very dramatic example of it. I was trying to compute the function F(n,k), defined to be the maximum of |S|×|P|, over all sets S of k-subsets and all … Continue reading
Posted in exposition
Tagged combinatorial explosion, computers, GAP, GRAPE, Leonard Soicher, partitions, subsets, transversals
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From the archive, 2
Next up is a document which is just over a quarter-century old, a photocopy of a 26-page handwritten document entitled “On doing geometry in CAYLEY”. The background, as explained in the document, is that John Cannon’s computer algebra system CAYLEY, … Continue reading
Posted in exposition, history
Tagged buildings, CAYLEY, chamber systems, codes, computer algebra, finite geometry, GAP, MAGMA
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