Algebra 225 Calculus 156 Mathematics 153 Physics 110 Electronics 87 Chemistry 85 Statistics 63 Differential equations 59 Trigonometry 59 Mathematical statistics 54 Textbooks 51 Psychology 48 Data processing 41 Electric circuits 41 Probabilities 40 Accounting 34 Algebras, Linear 33 Electrical engineering 31 Methodology 31 Research 31 Transcendental functions 31 Boundary value problems 30 Mechanics, Applied 30 Maintenance and repair 29 Signal processing 29 Environmental sciences 28 Thermodynamics 28 Mathematical models 25 Electric engineering 23 Electronic circuits 23