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Full Idea
Almost all the systems developed in the first part of the twentieth century are higher-order; first-order logic was an afterthought.
Gist of Idea
First-order logic was an afterthought in the development of modern logic
Source
Stewart Shapiro (Foundations without Foundationalism [1991], 7.1)
Book Ref
Shapiro,Stewart: 'Foundations without Foundationalism' [OUP 1991], p.173