Theoretical Computer Science
Natural deduction via graphs: formal definition and computation rules
Mathematical Structures in Computer Science
From deduction graphs to proof nets: boxes and sharing in the graphical presentation of deductions
MFCS'06 Proceedings of the 31st international conference on Mathematical Foundations of Computer Science
A sequent calculus with implicit term representation
CSL'10/EACSL'10 Proceedings of the 24th international conference/19th annual conference on Computer science logic
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Deduction Graphs are meant to generalise both Gentzen-Prawitz style natural deductions and Fitch style flag deductions. They have the structure of acyclic directed graphs with boxes. In [Herman Geuvers and Iris Loeb. Natural Deduction via Graphs: Formal Definition and Computation Rules. Mathematical Structures in Computer Science (Special Issue on Theory and Applications of Term Graph Rewriting), Volume 17(03):485-526, 2007.] we have investigated the deduction graphs for minimal proposition logic. This paper studies the extension with first-order universal quantification, showing the robustness of the concept of deduction graphs.