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by jacobolus 2879 days ago
Presumably APL the programming language.

Personally I used to use Maple for this kind of thing circa 2002. It used to launch on Windows in a fraction of a second (faster than the built in calculator tool!), and was an amazing calculator for pretty much any purpose.

Unfortunately some version of Maple around that time switched to a Java-based front end, and thereafter took forever to load, and had a UI littered with glitches.