The thesis studies the following problem: Given a set of geometrical figures (such as planar polygons), each one labelled according to whether or not it resembles some "ideal" figure, find a good approximation to that ideal figure which can be used to classify other figures in the same way. We work within the PAC learning model introduced by Valiant in 1984. Informally, the concepts under consi...

islamic architecture has a fundamental dignity and tries to preserve the spiritual and immortal elements. the most sensible characteristic of this type of art is the compatibility with the nature of islam; monotheism, which the mosque architecture provides the best bed for such purpose. the main model for constructing mosques, from both outward and internal spiritual truths point of view, is th...