Desafíos matemáticos

Sesenta autores, desde catedráticos de universidad hasta estudiantes de Secundaria y Bachillerato, nos presentan los cuarenta desafíos que la Real Sociedad Matemática Española propuso con motivo de su centenario.Son cuarenta estimulantes retos que avivan el ingenio. Enfrentándose a ellos, el lector se sentirá un auténtico investigador matemático.Pero no hay que asustarse. No es necesario saber muchas matemáticas. La herramienta esencial para resolver los desafíos es pensar ordenadamente.

California became a territory in the United States when the Treaty of Guadalupe Hidalgo was signed in 1848. That treaty ended the Mexican War. Several days before its signing, gold was discovered at Sutter’s Mill in what is now Sacramento. The non-Native population of the territory was less than one thousand in 1848, but the gold rush increased that number to one hundred thousand by the end of 1849. The gold rush not only made many people wealthy, it brought ecologic devastation while speeding up California’s statehood. This book richly explores this interesting history.

Willyrex y sTaXx sufren una repentina transformación de origen desconocido. Ahora se han vuelto pequeños y, por tanto, están indefensos: casi cualquier cosa supone un peligro para ellos. Tras el desconcierto inicial y un primer susto, viajarán hasta una gran ciudad y, camufl ados en el bolsillo de un famoso periodista, vivirán una aventura extraordinaria en la que tendrán que emplearse a fondo para salir con buen pie. ¿Serán capaces Willy y sTaXx de detener la amenaza a la que se enfrentan? ¿Lograrán recuperar su tamaño? ¡No te lo pierdas!

We have summarized the essential of the following texts: From POLITICAL ESSAYS, "The crisis of the Welfare State and the depletion of the utopian energies", from THEORY AND PRAXIS, "The classsical doctrine of politics and its relationships with philosophy", a small fragment of "Science and technique as ideology and the article "Modernity, an uncomplete project".

George W. Bush grew up in a prominent political family in Texas. After serving as Texas governor, Bush followed his father's footsteps in becoming President of the United States. This Spanish-translated biography allows readers to discover the life of George W. Bush and explore some of the impacts he made as president through acts like No Child Left Behind. Readers will also learn of the many unexpected challenges Bush faced, such as the al-Qaeda attack on September 11, 2001, the War on Terror, and the Iraq War. The engaging facts, vibrant images, and supportive text work in conjunction with...