![]() The algorithms and notation for this scheme were extended by the Australian philosopher and computer scientist Charles L. Dijkstra in the early 1960s to reduce computer memory access and use the stack to evaluate expressions. The reverse Polish scheme was again proposed in 1954 by Arthur Burks, Don Warren, and Jesse Wright and was independently reinvented by Friedrich L. The first computer to use postfix notation, though it long remained essentially unknown outside of Germany, was Konrad Zuse's Z3 in 1941 as well as his Z4 in 1945. The description "Polish" refers to the nationality of logician Jan Łukasiewicz, who invented Polish notation in 1924. It does not need any parentheses as long as each operator has a fixed number of operands. Reverse Polish notation ( RPN), also known as reverse Łukasiewicz notation, Polish postfix notation or simply postfix notation, is a mathematical notation in which operators follow their operands, in contrast to Polish notation (PN), in which operators precede their operands. ![]()
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