Esta es una colección de más de 200 acertijos y problemas matemáticos que he recopilado durante los últimos cuarenta años. Algunos son originales pero la mayoría están recogidos de aquí y de allá y muchos son de compañeros de estudios y de amigos afi-cionados a las matemáticas.

Los problemas están divididos en cuatro grupos: de lógica e ingenio, de aritmética y cálculo, de cálculo para expertos y, por último, una miscelánea de frases y anécdotas.

Quiero mostrar mi agradecimiento a todos los profesores, alumnos y amigos que me ayudaron con sus acertijos y problemas. Sería imposible nombrarlos a todos.

Espero que el lector disfrute tanto como lo hice yo resolvían-dolos y recopilándolos durante años.

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