Freyd, Peter On the concreteness of certain categories. (English) Zbl 0248.18008 Sympos. Math., Roma 4, Teoria Numeri, Dic. 1968, e Algebra, Marzo 1969, 431-456 (1970). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 1 ReviewCited in 7 Documents MSC: 18A15 Foundations, relations to logic and deductive systems 14F35 Homotopy theory and fundamental groups in algebraic geometry PDFBibTeX XML