Barack Obama was the last president
En matemáticas, la desigualdad de medios aritméticos y geométricos, o más brevemente la desigualdad AM-GM, establece que la media aritmética de una lista de números reales no negativos es mayor o igual que la media geométrica de la misma lista; y además, que los dos medios son iguales si y sólo si cada número de la lista es el mismo.
Islamic religious culture
The teachings of Islam began with the prophet Mohammad (570-632). The Islamic calendar dates the starting point of Islam in 622 on the Julian calendar, the year of Mohammad's <em>hegira </em>from Mecca to Medina with his followers to avoid an assassination plot in Mecca. Within a few years his following had grown and he returned to Mecca as headquarters of the Islamic faith. By the 8th century Islam had spread throughout the Middle East and North Africa and as far as the southern half of the Iberian peninsula.
Unrestricted submarine warfare is the practice of using submarines to attack and sink all forms of enemy shipping, whether they are military or civilian. It is most closely associated with the First World War when Germany's decision to use USW brought the US into the war and led to their defeat.
