about 1 years ago, j became FOSS.
https://en.wikipedia.org/wiki/J_%28p...ng_language%29
http://www.jsoftware.com/source.htm
Quote:
The J programming language, developed in the early 1990s by Kenneth E. Iverson and Roger Hui, is a synthesis of APL (also by Iverson) and the FP and FL function-level languages created by John Backus.[1]
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J is not a von Neumann programming language; however, it is possible to use the von Neumann programming style.
Since March 2011, J is free and open source software under the GPLv3 license.[4][5] One may also purchase source for commercial use under a negotiated license.[6]
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Linear Mode
