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Now showing items 1-9 of 9

#### Spatial modelling of fire dynamics in Savanna ecosystems.

(1999)

Fire is used in the management of ecosystems worldwide because it is a relatively inexpensive means of manipulating thousands of hectares of vegetation. Deciding how, where and when to apply fire depends primarily on the ...

#### On Stephani universes.

(1992)

In this dissertation we study conformal symmetries in the Stephani universe which is
a generalisation of the Robertson-Walker models. The kinematics and dynamics of
the Stephani universe are discussed. The conformal ...

#### Relativistic spherical stars.

(1993)

In this thesis we study spherically symmetric spacetimes which are static with a
perfect fluid source. The Einstein field equations, in a number of equivalent forms,
are derived in detail. The physical properties of a ...

#### On the integrity of domination in graphs.

(1993)

This thesis deals with an investigation of the integrity of domination in a.graph, i.e., the extent to
which domination properties of a graph are preserved if the graph is altered by the deletion of
vertices or edges or ...

#### Conformal symmetries : solutions in two classes of cosmological models.

(1991)

In this thesis we study the conformal symmetries in two locally rotationally symmetric
spacetimes and the homothetic symmetries of a Bianchi I spacetime. The
conformal Killing equation in a class AIa spacetime (MacCallum ...

#### Distance measures in graphs and subgraphs.

(1996)

In this thesis we investigate how the modification of a graph affects various
distance measures. The questions considered arise in the study of how the
efficiency of communications networks is affected by the loss of ...

#### Some Mal'cev conditions for varieties of algebras.

(1991)

This dissertation deals with the classification of varieties according to
their Mal'cev properties. In general the so called Mal'cev-type theorems
illustrate an interplay between first order properties of a given class ...

#### Conformal motions in Bianchi I spacetime.

(1992)

In this thesis we study the physical properties of the manifold in general relativity that admits a conformal motion. The results obtained are general as the metric tensor field is not specified. We obtain the Lie derivative ...

#### The theory of option valuation.

(1992)

Although options have been traded for many centuries, it has remained a relatively
thinly traded financial instrument. Paradoxically, the theory of option
pricing has been studied extensively. This is due to the fact ...