Algebraic topologists work with compactly generated spaces, CW complexes, or spectra. The theorem was developed by topologists Samuel Eilenberg and Saunders MacLane. Indecomposable continua have been used by topologists as a source of counterexamples. At Cambridge he was a student of topologists Andrew Casson and John Frank Adams. The group "F" was rediscovered at least twice by topologists during the 1970s. Topologists would refer to such a construction as a simplicial complex. Topologists assigned these classes of spaces the names T, T, T, and T.