LYCOS RETRIEVER 
Reverse Polish Notation: Jan Lukasiewicz
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The date of the first application of the Polish Notation in computing is less clear. Kennedy lists an article by Burks et al. [4], although without explanation, but that suggests that this was the first use of the Polish Notation in computing, in 1953. However, Burks et al. ... published an earlier report [5], in which they explicitly used the term Polish Notation in the title. Although they do not quote the source of their information on the Polish Notation, it is likely that it was the publication of the English translation of the Lukasiewicz’ book [6]. On the other hand, Bauer, in multiple articles on his machine Stanislaus [7-9], named such “in honor of the Polish school of logic” [9], explains in detail how he came to learn about this notation, which he initially called the Warsaw notation [7], that brought him to the concept of a stack (Kellerprinzip). He first heard of it in 1948-49, at the seminar by a German inventor Konrad Zuse, who got the idea from the Viennese logician Karl Menger (1943), who in turn learned about it from a Berlin logician Karl Schroter (1935).
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PLN stands for Postfix Literal Notation (sometimes referred to as “reverse Polish notation” with reference to the Polish logician Jan Lukasiewicz, who substituted the letters of Polish words for the operators used by Russell and Whitehead). Its particular advantage is its adaptability to the computer, both in making use of an ordinary keyboard and in the relative ease of programming when it is the final letter of a string that expresses the operation in that string.
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Polish Notation was devised by the Polish philosopher and mathematician Jan Lucasiewicz (1878-1956) for use in symbolic logic. In his notation, the operators preceded their arguments, so that the expression above would be written as
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Way of writing algebraic expressions that does not require parentheses to state which operations are done first; ... called reverse Polish notation. It is named in honor of its inventor, Jan Lukasiewicz (1878-1956).
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Jan Lukasiewicz