  In this paper we present a short overview of the new Wolfram Mathematica
package intended for elementary "in-basis" tensor and differential-geometric
calculations. In contrast to alternatives our package is designed to be
easy-to-use, short, all-purpose, and hackable. It supports tensor contractions
using Einstein notation, transformations between different bases, tensor
derivative operator, expansion in basis vectors and forms, exterior derivative,
and interior product.
