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The position of Polish informatics, as well in research as in didactic, has its roots in achievements of Polish mathematicians of the Warsaw School and logicians of the Lvov-Warsaw School. Jan Lukasiewicz is considered in the world of computer science as the most famous Polish logician. The parenthesis-free notation, invented by him, is known as PN (Polish Notation) and RPN (Reverse Polish Notation)...
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