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# Tag Archives: buildings

## Dima Fon-Der-Flaass

Yesterday, Edwin van Dam reminded us of a conjecture he and Willem Haemers made ten years ago: almost all graphs are determined by their spectra. This contrasts with the situation for special classes of graphs such as trees, and indeed … Continue reading

Posted in history
Tagged algebraic graph theory, antichains, buildings, IBIS groups, Lambda-trees, matroids, twin trees
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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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