nLab
Philip Higgins

Philip J. Higgins (born 1926) is a British mathematician, who has worked in areas of algebra and algebraic topology. He is well known for his book

• P. J. Higgins, Categories and groupoids, Repr. Theory Appl. Categ., 1 – 178 (electronic), ISSN 1201-561X, reprint of the 1971 original Notes on categories and groupoids, (Van Nostrand Reinhold, London; MR0327946) with a new preface by the author.

and for his long standing collaboration with Ronnie Brown on nonabelian algebraic topology, see here.

His earlier paper

• P. J. Higgins, Algebras with a scheme of operators, Math. Nachr. 27 (1963) 115–132.

has been influential: it deals with partial operations, following on from his paper

• P. J. Higgins, Groups with multiple operators, Proc London Math. Soc. VI (1956) 366-416.

His paper

• P. J. Higgins, The fundamental groupoid of a graph of groups, J. London Math. Soc. (2), 13 (1976) 145–149,

developed methods that were later on used by Haefliger in assigning a groupoid to a complex of groups.

Recently he worked with Kirill Mackenzie on Lie groupoids and Lie algebroids

category: people