Watch out, Amanda! Birkhoff is not a happy hacker. On Friday's episode of Nikita (9/8c, The CW), Birkhoff (Aaron Stanford) is still reeling from Amanda (Melinda Clarke) killing his father, NSA ...

Up until the moment that Peller's face showed up on Birkhoff's computer screen, there was no doubt that he was "Nerd." He greeted Nikita with enthusiasm and counseled both Michael and Nikita as only ...

The Nature Index 2025 Research Leaders — previously known as Annual Tables — reveal the leading institutions and countries/territories in the natural and health sciences, according to their output in ...

In this article we consider the evolution of vortex sheets in the plane both as a weak solution of the two dimensional incompressible Euler equations and as a (weak) solution of the Birkhoff-Rott ...