The principles of mathematics revisited
The principles of mathematics revisited
Dependence Logic: A New Approach to Independence Friendly Logic (London Mathematical Society Student Texts)
On Definability in Dependence Logic
Journal of Logic, Language and Information
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Team logic is a new logic, introduced by Väänänen [12], extending dependence logic by classical negation. Dependence logic adds to first-order logic atomic formulas expressing functional dependence of variables on each other. It is known that on the level of sentences dependence logic and team logic are equivalent with existential second-order logic and full second-order logic, respectively. In this article we show that, in a sense that we make explicit, team logic and second-order logic are also equivalent with respect to open formulas. A similar earlier result relating open formulas of dependence logic to the negative fragment of existential second-order logic was proved in [8].