Read "A programming language", where APL came from - https://www.amazon.com/Programming-Language-Kenneth-Iverson/dp/0471430145 https://www.amazon.com/Programmin

Read "A programming language", where APL came from - https://www.amazon.com/Programming-Language-Kenneth-Iverson/dp/0471430145 https://www.amazon.com/Programming-Language-Kenneth-Iverson/... - you might get more understanding why it is the way it is. It is the mathematical notation, put into, as Dijkstra expressed, "technologies of the past", completed (to be Turing-complete) and made executable. At least, I think, this is the basic idea.