Inc. BarCharts 
Discrete Mathematics [PDF ebook] 

Skills used in business and also present in most middle & high school math competitions. Computer science is almost entirely built upon this higher-level real world math that teaches reasoning and proof techniques. Often a required course for computer science majors, this 6-page guide is your reference tool for success. Suggested uses: Professors/Teachers tool for continued reference throughout a course, use to build quizzes, for open-guide tests, and as support for struggling students Students quick and easy reference tool, math competitions, review guide for quizzes, tests, exams and homework help Computer Science Majors a must have for a core principle within your studies