Using a Linux kernel patch to allow GDB to work on the Linux kernel helped in solving problems on the filesystem that I work on in Linux.

Variational design is the kernel of contemporary CAD technology. There are many solving methods for geometric constraint solving at the aim of variational design, but they all have some limitations.

Sequence transformation is based on the principle of extrapolation, interpolating certain items by the kernel of the sequence, and finally is obtained by solving linear equations.