Materials were written for an entire year's course in geometry in which transformations were used to develop the concepts of congruence, similarity, and symmetry, as well as being a vehicle for proof.

Geometric Algebra (GA) has emerged as a transformative framework in power systems analysis, offering a unified mathematical language that extends classical vector and complex number techniques. By ...

The original formed the first part of "Festschrift zur feier der enthüllung des Gauss-Weber-denkmals in Göttingen, Grundlagen der geometrie," with the additions made by the author in the French ...