Joel Achenbach reports on science and health for the National desk. He has been a staff writer for The Post since 1990. Email: [email protected] ...

A simple program which checks Python source files for errors. Pyflakes analyzes programs and detects various errors. It works by parsing the source file, not importing it, so it is safe to use on ...

• Perform basic operations with complex numbers, derive and use Euler's formula; • Solve first-order linear and variable separable differential equations; • Solve second-order linear differential ...