Nov 292012

**Lars Valter Hörmander**, who made fundamental contributions to all areas of partial differential equations, but particularly in developing the analysis of variable-coefficient linear PDE, passed away at the age of 81 on November 25, 2012.

Hörmander was born on January 24, 1931. He was awarded the Fields Medal in 1962, the Wolf Prize in 1988. His “Analysis of Linear Partial Differential Operators I–IV(线性偏微分算子分析)” is considered a standard work on the subject of linear partial differential operators.