Rithmomachia: An Academic Proposal of Rules Authors: Guardia, Tomás, Durnil, Rié

Subjects: “…Juegos de tablero, Ritmomaquia, Reglas…”

Problems and Solutions The Authors: Nieto, José, Tipe, Jorge

“…The goal of this section is to present interesting mathematical problems andits solutions. We invite the readers to propose problems which may be tackled byhigh school or college students without specialized knowledge.…”

The Cultural Impact of Hindu-Arabic Numbers Authors: Guardia, Tomás

Subjects: “…Sistemas de numeración simbólicos, nú- meros romanos, sistemas de numeración posicionales, números indoar ábigos, evolución de los números.…”

An introduction to combinatorial geometry: fair division problems. Authors: Gomez Navarro, Cuauhtemoc

Subjects: “…geometría combinatoria, teorema del Ham Sandwich, rotaciones y traslaciones, continuidad…”

Two-dimensional Relations and the Hybrid Numbers of Lucas Sequence Authors: Mangueira, Milena, Vieira, Renata, Alves, Francisco, Catarino, Paula

Subjects: “…Lucas sequence. Two-dimensional Re- lationship. Hybrid Numbers…”

The magic of the h-vector Authors: Almendra Hernández, Félix

Subjects: “…combinatoria polihédrica, complejos simpliciales, h-vecto…”

Lagrange Interpolation Formula and Arithmetic Progressions of Higher Order Authors: Magalhaes, Cicero, Safaei, Navid

“…We use it to prove identities, and we show its relation with derivation and its applications to arithmetic progressions of higher order, introducing the finite dierences operator which opens a fan of possibilities for students preparing for mathematical competitions.…”

Mathematics competitions, a perspective from Puerto Rican teaching Authors: Cáceres, Luis, Henao, Ferney

“…This article summarizes the findings found in a study carried out with mathematics teachers, at the secondary level, from public and private schools in Puerto Rico. …”

Problems and Solutions Authors: Nieto, Jose, Tipe, Jorge

“…The goal of this section is to present interesting mathematical problems and its solutions. We invite the readers to propose problems which may be tackled by high school or college students without specialized knowledge. …”

Geometric Intuition at the Olympiad level Authors: Losada, María E.

Subjects:

The Stern – Brocot tree Authors: Czwienczek Miler, Fabiola

Subjects: “…árbol de Stern-Brocot…”

Dialogue about a cubic equation Authors: Báez Duarte, Luis, Octavio, Alfredo

Subjects:

Using Direct and Contructive Methods for the Existence of Origami Models with Given Boundary Conditions Authors: Geretschläger, Robert, Keeling, Stephen L.

“…Noting that it is of interest to determine origami models whose edges coincide with a polyline fullling the required conditions, we then proceed to show some methods for reconstructing the origami model if the boundary is known. …”

Problems and Solutions Authors: Nieto, José, Tipe, Jorge

“…The goal of this section is to present interesting mathematical problems and its solutions. We invite the readers to propose problems which may be tackled by high school or college students without specialized knowledge. …”

The Math Kangaroo Competition Authors: Akveld, Meike, Cáceres Duque, Luis, Nieto Said, José Heber, Sánchez Lamoneda, Rafael

“…In this paper we brie y explain what Math Kangaroo is. This is followed by a representative sample of Kangaroo questions, varying over all ages and all areas of mathematics that are covered by this competition. …”

Assessment and Methods for Solving the Problems of the Republican Mathematical Olympiad for Schoolchildren in Kyrgyzstan Authors: Keldibekova, Aida О., Sopuev, Ulanbek A.

Subjects:

Minimizing Disagreements in the United Nations Authors: Soifer, Alexander

Subjects: “…Teoría de Grafos…”

Functions over the integers and grasshoppers Authors: Martín del Campo, Adán Medrano

“…Each problem can be interpreted as a sequence of jumps of agrasshopper.…”

Density arguments and Kronecker’s lemma Authors: Caminha, Antonio

Subjects:

The story of the project El Alfil Matemático Authors: Rosas Celis, Mercedes

“…This is article presents a brief description of the project El Alfil Matemático. …”