Abstract

Frege's advances in the development of quantification have rarely been subjected to historical interpretation. While the characterization of existence as a second-order concept awaited the invention of the Begriffsschrift, important philosophical innovations had taken place since Kant's critique of the ontological argument. In particular, Herbart had re-conceptualized the nature of existential judgement and this was recognized and adopted by Brentano. In this light, thepossible influence of Herbart and Brentano (or their schools) upon Frege's work is elaborated and critically considered.