Objects with closed diagonals

Counterexamples in Topology.

Mary Ellen Rudin, Lynn Arthur Steen, J. Arthur Seebach · American Mathematical Monthly · 1971 · 667 citations · Full text

Categories of continuous functors, I

Peter Freyd, G. M. Kelly · Journal of Pure and Applied Algebra · 1972 · 326 citations

Natural Sciences, Mathematics, Topology +5

Monomorphisms, Epimorphisms, and Pull-Backs

G. M. Kelly · Journal of the Australian Mathematical Society · 1969 · 120 citations · Full text

Natural Sciences, Mathematics, Algebra +8

Classifying spaces and infinite symmetric products

Michael C. McCord · Transactions of the American Mathematical Society · 1969 · 117 citations · Full text

Natural Sciences, Mathematics, Discrete Mathematics +9

Compact Hausdorff objects

Ernest G. Manes · General Topology and its Applications · 1974 · 74 citations