Pierre Lelong

Pierre Lelong (14 March 1912 Paris – 12 October 2011)[1] was a French mathematician who introduced the Poincaré–Lelong equation, the Lelong number and the concept of plurisubharmonic functions.

Lelong earned his doctorate in 1941 from the École Normale Supérieure, under the supervision of Paul Montel.

[2] On 5 June 1981 Lelong received an honorary doctorate from the Faculty of Mathematics and Science at Uppsala University, Sweden.

Especially of great impact is his work on the Poincaré-Lelong equation, closed positive currents and Lelong numbers.

The best way to understand this very important part of his work is to look at it from the historic perspective of constructing meromorphic functions on abstractly defined complex manifolds and see how his contributions fit in a pivotal way into the global landscape in the theory of several complex variables.The theory of several complex variables studies complex-analytic objects such as holomorphic and meromorphic functions and maps, complex-analytic subvarieties, holomorphic vector bundles, and coherent analytic sheaves.