MacLane, Saunders; Whitehead, J. H. C. On the 3-type of a complex. (English) Zbl 0035.39001 Proc. Natl. Acad. Sci. USA 36, 41-48 (1950). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 3 ReviewsCited in 88 Documents MathOverflow Questions: Braided R-matrices for finite action groupoids Keywords:Topology × Cite Format Result Cite Review PDF Full Text: DOI