Carroll
The contributions of Lewis Carroll (Charles L. Dodgson, 1832–1898) to logic consist of several pieces published between 1887 and 1899. The Game of Logic (London, 1887) is a book written for young people to teach them to reason logically by solving syllogisms using diagrams and colored counters. His diagrammatic method is a visual logic system that we know now to be sound and complete.
In Symbolic Logic, Part I (London, 1896) Carroll developed two formal methods to solve syllogisms and
sorites. The first is the Method of Underscoring that is dependent on his idiosyncratic algebraic notation that he called the Method of.....
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