William Schumacher Massey (1920-2017) was an American algebraic topologist. He is best known for the development of Massey products and for contributions to the theory of spectral sequences, via his work on exact couples. He wrote several influential textbooks.
William S. Massey: Algebraic Topology: An Introduction, Harcourt Brace & World (1967), Graduate Texts in Mathematics 56, Springer (1977) [ISBN:9780387902715]
William S. Massey: A Basic Course in Algebraic Topology, Graduate Texts in Mathematics 127, Springer (1991) [doi:10.1007/978-1-4939-9063-4]
The Arnold-Kuiper-Massey theorem:
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