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# Accession Number:

## ADA312447

# Title:

## Inverse Semigroups and Boolean Matrices,

# Descriptive Note:

# Corporate Author:

## NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA

# Report Date:

## 1996-05-01

# Pagination or Media Count:

##
53.0

# Abstract:

## Following its fragmentary beginnings in the 1920s and 1930s, the algebraic theory of semigroups has grown from seminal attempts at generalizing group theory into a vast and independent branch of algebra. One subbranch is the extensively developed and exceptionally promising class of inverse semigroups. Intuitively speaking, these semigroups are to partial symmetry what groups are to symmetry. Here we describe software designed to multiply elements of certain inverse semigroups, just as hand calculators multiply numbers. Given the wide range of applications of group theory symmetry e.g., understanding roots of polynomials, deriving Laplace spherical functions, understanding rigid-body motion, and classifying quantum particles, it is only natural to consider applications of the more general mathematical theory of partial symmetries. As a first step, the authors have developed software to perform basic inverse semigroup operations multiplications, inverses, etc.. Since the elements of these semigroups may also be pictured as certain matrices of Os and 1s-usually called monomial or Boolean matrices-the Boolean matrix calculator described in Part 2 is designed to simultaneously display a given semigroup element in both path notation which exhibits the partial symmetries and the corresponding monomial 0-1 matrix. The calculator takes entries in either path notation or matrix notation, and when a Boolean matrix M is the input, the program determines if M represents an element of the semigroup.

# Distribution Statement:

## APPROVED FOR PUBLIC RELEASE

#