Professor Ronnie Marks, 1935–2020

Introduction by Ronnie Brown

The theory we describe in this book was developed over a long period, starting about 1965, and always with the aim of developing groupoid methods in homotopy theory of dimension greater than 1. Algebraic work made substantial progress in the early 1970s, in work with Chris Spencer, and in 1974 by Brown and Higgins. A substantial step forward in 1974 led us over the years into many fruitful area...

Ronnie Hermens Weakly Intuitionistic Quantum Logic

In this article von Neumann’s proposal that in quantum mechanics projections can be seen as propositions is followed. However, the quantum logic derived by Birkhoff and von Neumann is rejected due to the failure of the law of distributivity. The options for constructing a distributive logic while adhering to von Neumann’s proposal are investigated. This is done by rejecting the converse of the ...

Winsor , Major Professor Albert Choi , Minor Professor

TABLE OF MARKS OF FINITE GROUPS

Let G be a finite group and C(G) be the family of representative conjugacy classes of subgroups of G. The matrix whose H;K-entry is the number of fixed points of the set G=K under the action of H is called the table of marks of G where H;K run through all elements in C(G). In this paper, we compute the table of marks and the markaracter table of groups of order pqr where p, q, r are prime numbers.

Bench marks

worldwide have been trained in seed conservation techniques. Paul Smith, head of the MSB, said: " Plant diversity is a vital part of the system upon which we depend. The need for the kind of insurance policy the Millennium Seed Bank provides has never been greater ". Earlier last month another project was launched to document all the 1.8 million named species of life on Earth. Called the Encycl...