### Some articles on *deduction systems, systems, deduction*:

Mathematical Logic - Proof Theory and Constructive Mathematics

... Proof theory is the study of formal proofs in various logical

... Proof theory is the study of formal proofs in various logical

**deduction systems**... Several**deduction systems**are commonly considered, including Hilbert-style**deduction systems**,**systems**of natural**deduction**, and the sequent calculus developed by ... of mathematical logic, includes the study of**systems**in non-classical logic such as intuitionistic logic, as well as the study of predicative**systems**...### Famous quotes containing the word systems:

“No civilization ... would ever have been possible without a framework of stability, to provide the wherein for the flux of change. Foremost among the stabilizing factors, more enduring than customs, manners and traditions, are the legal *systems* that regulate our life in the world and our daily affairs with each other.”

—Hannah Arendt (1906–1975)

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