Resumen de Evolution of the concept of tangent.

Ricardo Abreu Blaya, Crisólogo Dolores Flores, José Luis Sánchez Santiesteban, José María Sigarreta Almira

• The present paper is concerned with an epistemological study of the notion of tangent line as a point of subsets of R2. We begin with a brief study of some basic facts for the tangent at classical differentiable curves, as a starting point for deeper developments involving very general subsets of R2, wich is mainly based in Geometric Measure Theory