

3 artículos
Another proof of the quadratic formula: comparison with the traditional proof and Po-Shen Loh's approach, and its use as a solution method
Guido José Fernández Quirós
The Variogram as a Tool for Characterization
Katalina Oviedo Rodríguez, Alda Carvalho
Elementary characterization with ellipses tangent to a line and a circle of the convex hull of a certain pair of circles.
Benjamín A. Itzá-Ortíz, Erika E. Rodríguez-Torres, Margarita Tetlalmatzi-Montiel