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 dsp on The enhanced power graph is weakly perfect
 dsp on The enhanced power graph is weakly perfect
 What Lovelace Did: From Bombelli to Bernoulli to Babbage  on Polynomials taking integer values
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Category Archives: numbers
235711
Yesterday, my friend and excolleague Dan Hughes emailed a group of his friends to explain that he had established that earth had been visited in antiquity by alien group theorists. How else to explain that the number of minutes in … Continue reading
Numbers Farm
In Kings Langley, just northwest of London on the Grand Union Canal, behind the railway station you will find Numbers Farm. What crops do they grow there? Here are some of the staples: In the furtherflung fields you find more … Continue reading
Posted in geography, numbers
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Large numbers
Littlewood published an article entitled “Large numbers” in the Mathematical Gazette in 1948. One of his examples depends on his own theorem about the relation between π(x) (the number of primes up to x) and li(x) (the integral of 1/log t … Continue reading
Posted in exposition, numbers, open problems
3 Comments
The symmetric group, 1
This is the first of a short series of posts which will try to look at the symmetric group in slightly fresh ways. It is in part a fraternal greeting to my friends on SymOmega, who named their blog after … Continue reading
Posted in books, exposition, numbers, symmetric group
9 Comments
Counting
I’m teaching enumerative combinatorics this term; it brings an old incident back to my mind. In 1984, Dugald Macpherson and I stopped for breakfast at a Dutch pancake house near Vancouver. The restaurant offered a choice of “1001 toppings”. We … Continue reading
Posted in books, exposition, numbers
3 Comments