Abstract
Weak variants Q-, R, and R_0 of Robinson arithmetic, and the theory of concatenation TC, and essential udecidability proofs of those are discusses. A proof of self-reference theorem for the theory R_0 is given.
Weak variants Q-, R, and R_0 of Robinson arithmetic, and the theory of concatenation TC, and essential udecidability proofs of those are discusses. A proof of self-reference theorem for the theory R_0 is given.