QA Mathematics QA75 Electronic computers. Computer science 17 Q Science (General) 15 TJ Mechanical engineering and machinery 8 QA76 Computer software 5 TK Electrical engineering. Electronics Nuclear engineering 5 L Education (General) 4 T Technology (General) 4 Analysis 3 H Social Sciences (General) 3 Research 3 Fuzzy arithmetic 2 Fuzzy logic 2 HG Finance 2 LB Theory and practice of education 2 LB1501 Primary Education 2 Problems, exercises, etc 2 QC Physics 2 Computers and civilization. Social aspects of computers. Hackers 1 Elementary mathematics. Arithmetic 1 HF Commerce 1 HQ The family. Marriage. Woman 1 Institutions of higher education 1 LB1603 Secondary Education. High schools 1 Life style 1 Mathematical statistics. Probabilities 1 Mechanical devices and figures. Automata. Ingenious mechanisms.Robots (General) 1 Q Science 1 QH301 Biology 1 Quantitative research 1