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math.LO2001
A stronger form of the theorem constructing a rigid binary relation on any set
Apoloniusz Tyszka
On every set A there is a rigid binary relation i.e. such a relation R \subseteq A \times A that there is no homomorphism (A,R) \rightarrow (A,R) except the identity (Vop{ě}nka et…
math.MG2001
Discrete versions of the Beckman-Quarles theorem from the definability results of Raphael M. Robinson
Apoloniusz Tyszka
We derive author's discrete forms of the Beckman-Quarles theorem from the definability results of Raphael M. Robinson.