Andrzej Grzegorczyk

2 offprints: Assertions Depending on Time and Corresponding Logical Calculi (1968); Some Proofs of Undecidability of Arithmetic (1955)

Offprints, the first from Compositio Mathematica, Vol. 2, 1968, the second from Fundamenta Mathematicae XLIII (2) 1955, both with light wear. Item #H9616

Price: $25.00