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Full Idea
The greatest challenge for traditional term logicians was the proper formulation and treatment of relational expressions.
Gist of Idea
Traditional term logic struggled to express relations
Source
George Engelbretsen (Trees, Terms and Truth [2005])
Book Ref
'The Old New Logic', ed/tr. Oderberg,David S. [MIT 2005], p.37
A Reaction
The modern term logic of Fred Sommers claims to have solved this problem.
Related Idea
Idea 17744 De Morgan started the study of relations and their properties [De Morgan, by Walicki]