Tag Archives: Catalan

Between Fermat and Mersenne

The following problem came up in something I was doing recently. I have no idea how difficult it is – it looks hard to me – but I would be glad to hear from anyone who knows more than I … Continue reading

Posted in open problems | Tagged , , | 15 Comments

Ramon Llull

Last Saturday the Guardian had a review of The Serpent Papers by Jessica Cornwell (granddaughter of John Le Carré). Set in Barcelona and Mallorca, the book is a murder mystery and more; its presiding genius is Ramon Llull, the mediaeval … Continue reading

Posted in mathematics and ... | Tagged , , , , , , , , , | 2 Comments