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Mathematical Computing In J:
This book introduces mathematical computing using J - a powerful new programming language with practical applications in mathematics, actuarial analysis, scientific research, business data processing, and education. Derived from APL, J was designed as an executable mathematical notation by Dr. Kenneth E. Iverson and was implemented by Roger K.W. Hui. J unifies many areas of mathematics, has a simple consistent syntax with very few rules, yet includes a large number of functions and operators as tools for thinking and problem solving. [via]