2 results
Ramanathan S. Thinniyam.
We study the first order theory of structures over graphs i.e. structures of the form ($\mathcal{G},\tau$) where $\mathcal{G}$ is the set of all (isomorphism types of) finite undirected graphs and $\tau$ some vocabulary. We define the notion of a recursive predicate over graphs using Turing Machine […]
Published on September 24, 2018
Pascal Baumann ; Moses Ganardi ; Ramanathan S. Thinniyam ; Georg Zetzsche.
We study first-order logic (FO) over the structure consisting of finite words over some alphabet $A$, together with the (non-contiguous) subword ordering. In terms of decidability of quantifier alternation fragments, this logic is well-understood: If every word is available as a constant, then even […]
Published on December 21, 2023