###

The *Notices* offerings for April are diverse and fascinating. We have an article about the development of ergodic theory. There is an article about the level of errors in the mathematical literature and how we deal with them. Another piece treats the issue of historical chronology, or how we can be sure of the dates of important events. And there is a memory of distinguished mathematician Raoul Bott. April is Mathematics Awareness Month, and the theme this year is Mathematics and Sustainability. The Opinion Column by Simon Levin and the Communication by Rachel Levy treat this topic. --Steven G. Krantz, Editor
(pp. )

Email this

### Loring W. Tu, Coordinating Editor

(pp. 398)

Email this

### Joseph F. Grcar

(pp. 418)

Email this

### Florin Diacu

(pp. 441)

Email this

### Don Ornstein

(pp. 450)

Email this