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Affine systems of equations and counting infinitary logic

open access: yes, 2007
We study the definability of constraint satisfaction problems (CSP) in various fixed-point and infinitary logics. We show that testing the solvability of systems of equations over a finite Abelian group, a tractable CSP that was previously known not to ...
Andrei Bulatov   +2 more
core  

On Logical and Scientific Strength. [PDF]

open access: yesErkenntnis
Incurvati L, Nicolai C.
europepmc   +1 more source

Hilbert's Early Metatheory Revisited. [PDF]

open access: yesErkenntnis
Giovannini EN, Schiemer G.
europepmc   +1 more source

Cartagena Logic [PDF]

open access: yes
We introduce a new kind of infinitary logic that we call Boolean expansion of ${\mathcal L}_{\kappa \kappa}$. This logic involves a new kind of variable, that we call generalised Boolean variable.
Kivimäki, Siiri   +2 more
core  

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