We offer a geometric introduction to the two-dimensional Euclidean Space E2 using both the geometric approach of the affine R-Space and the two-dimensional Geometric Algebra.These notes, intented for university proffessors of physics and mathematics, try to emulate the program developed by Felix Kline in the first decade of the 20th century.

We enlarge a previus introduction to the two-dimensional geometric algebra published in Volume 05(02) of SELECCIONES MATEMÁTICAS. It is a friendly introduction of a theme of common interest for university proffessors and students of physics and mathematics.

We offer a geometric introduction to the two-dimensional Euclidean Space E2 using both the geometric approach of the affine R-Space and the two-dimensional Geometric Algebra.These notes, intented for university proffessors of physics and mathematics, try to emulate the program developed by Felix Kline in the first decade of the 20th century.

We enlarge a previus introduction to the two-dimensional geometric algebra published in Volume 05(02) of SELECCIONES MATEMÁTICAS. It is a friendly introduction of a theme of common interest for university proffessors and students of physics and mathematics.

Starting from Pauli and Dirac matrices of 1928 we present a friendly and unified version of the classical groups of mathematical physics as subgroups of sub algebras of real geometric algebras, created and presented for Clifford in 1879, the prior concept of Clifford algebras.

Starting from Pauli and Dirac matrices of 1928 we present a friendly and unified version of the classical groups of mathematical physics as subgroups of sub algebras of real geometric algebras, created and presented for Clifford in 1879, the prior concept of Clifford algebras.