1. In Łukasiewicz's 1951 book, Aristotle's Syllogistic from the Standpoint of Modern Formal Logic, he mentions that the principle of his notation was to write the functors before the arguments to avoid brackets and that he had employed his notation in his logical papers since 1929.

1951년에 쓰여진 루카쉐비치의 책 Aristotle's Syllogistic from the Standpoint of Modern Formal Logic에서, 그는 그의 표기법의 원칙은 괄호를 피하기 위해 인자 앞에 함수적 술어를 쓰는 것이었으며, 1929년부터 그의 논리학 논문에서 그의 표기법을 사용해 왔다고 언급한다.