An empty exercise

@inproceedings{Boor1990AnEE,
  title={An empty exercise},
  author={C. de Boor},
  booktitle={SGNM},
  year={1990}
}
The exercise in question concerns the rules which should govern the treatment of empty matrices in a matrix-oriented computing environment like MATLAB. This provides students of Linear Algebra with an unusual test of their understanding of the standard definitions and rules governing matrices.