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It deals with paths traced out by moving points, sets of points satisfying given geometrical conditions, and problems on finding maxima and minima. The book contains more than 200 problems which lead the reader towards some important areas of modern mathematics, and will interest a wide range of readers whether they be high school or university students, teachers, or simply lovers of mathematics.

Contents: 1. Definition of plasma. 2. Motion of elections and ions in plasma in the absence of external fields. 3. Plasma behaviour in electric field. 4. Plasma behaviour in magnetic field. 5. The effect of the magnetic field on characteristics of the plasma. 6. Results derived from magnetohydrodynamic equations. 7. Development of experimental target. 8. Conditions for existence of a plasma ring. 9. The theory of stability. 10. Plasma behaviour in traps with magnetic mirrors. 11. Stability of plasma configurations. 12. Shear stabilization. 13. Other plasma instabilities.