A Correction to the Sentential Calculus of Tarski's Introduction to Logic
Received December 8, 1941. 1 Alfred Tarski, Introduction to logic and to the methodology of deductive sciences, New York 1941. See page 147. 2Page 151, last paragraph. I have brought this error to the attention of Professor Tarski. He attributes it to inadvertence in writing down the axioms, and plans to make the necessary changes in the next edition of his book. Note added January 6, 1942. I have just noticed that the above matrices for "--" and ".-" are the same, except for differences in designation of the elements, as those given by Lukasiewicz (1868, p. 65) for his three-valued calculus.