Some African problems

global results on some nonlinear partial differential equations for direct and inverse problems

در این رساله به بررسی رفتار جواب های رده ای از معادلات دیفرانسیل با مشتقات جزیی در دامنه های کراندار می پردازیم . این معادلات به فرم نیم-خطی و غیر خطی برای مسایل مستقیم و معکوس مورد مطالعه قرار می گیرند . به ویژه، تاثیر شرایط مختلف فیزیکی را در مساله، نظیر وجود موانع و منابع، پراکندگی و چسبندگی در معادلات موج و گرما بررسی می کنیم و به دنبال شرایطی می گردیم که متضمن وجود سراسری یا عدم وجود سراسر...

Some Properties and Some Problems

We study properties of functors on categories of sets (classes) together with set (class) functions. In particular, we investigate the notion of inclusion preserving functor, and we discuss various monotonicity and continuity properties of set functors. As a consequence of these properties, we show that some classes of set operators do not admit functorial extensions. Then, starting from Aczel’...

Some Solutions , Some Problems , and Some

This is a slightly expanded written version of a plenary lecture given at the 20th IEEE Conference on Decision and Control, December 198 1, San Diego, CA. This talk is intended to help spark discussion among researchers in decision, control and estimation about the status of research in the field and of promising new directions for research. One such direction, model-based signal processing, is...

some new leads for human african trypanosomiasis (african sleeping sickness)

African Communication: Problems and Prospects

This article sketches a broad overview of the problems and prospects of Africa communication. Beginning with Africa's economic handicaps which limit its potential to fully exploit the new array of modern communication technologies, it argues that it is class politics which excludes the mass of the African people from communication channels that constitutes the major impediment to communication ...