Whitehead moves for G -trees

The Diameter of the Thick Part of Moduli Space and Simultaneous Whitehead Moves

Let S be a surface of genus g with p punctures with negative Euler characteristic. We study the diameter of the -thick part of moduli space of S equipped with the Teichmüller or Thurston’s Lipschitz metric. We show that the asymptotic behaviors in both metrics are of order log.gCp /. The same result also holds for the -thick part of the moduli space of metric graphs of rank n equipped with the ...

Test Groups for Whitehead Groups

We consider the question of when the dual of a Whitehead group is a test group for Whitehead groups. This turns out to be equivalent to the question of when the tensor product of two Whitehead groups is Whitehead. We investigate what happens in different models of set theory.

The Whitehead Institute for Biomedical Research

What is it famous for? The Whitehead Institute is probably one of those places that's famous for being famous. But that's not to say it doesn't deserve its reputation. Despite its relatively small staff — only 15 scientists are on the faculty — the Whitehead has a publication record that puts it among the top research institutions in genetics and molecular biology. What's its focus? Work there ...

Alfred North Whitehead

Alfred North Whitehead (1861-1947) never wrote a comprehensive work in philosophy of education, but he occasionally delivered lectures concerned with educational policy. These incisive talks are collected in his book The Aims of Education and Other Essays. Whitehead and Dewey were contemporaries, and their ideas are in some notable respects similar. Like Dewey, Whitehead stresses the importance...

The Whitehead First Lemma for Alternative