Differential geometry arguably offers the smoothest transition from the standard university mathematics sequence of the first four semesters in calculus, linear algebra, and differential equations to the higher levels of abstraction and proof encountered at the upper division by mathematics majors. Today it is possible to describe differential geometry as "the study of structur...(展开全部)

Differential geometry arguably offers the smoothest transition from the standard university mathematics sequence of the first four semesters in calculus, linear algebra, and differential equations to the higher levels of abstraction and proof encountered at the upper division by mathematics majors. Today it is possible to describe differential geometry as "the study of structur...(展开全部)

La única novela que escribió, Carl Sagan imagina una gran aventura, el primer encuentro del hombre con otros seres inteligentes.

At first it seemed impossible - a radio signal that came not from Earth but from far beyond the nearest stars. But then the signal was translated, and what had been impossible became terrifying. For the signal contains the information to build a Machine that can travel to the stars. A Machine that can take a human to meet those that sent the message. They are eager to meet us: ...(展开全部)

In December， 1999， a multinational team journeys out to the stars， to the most awesome encounter in human history. Who -- or what -- is out there?In Cosmos， Carl Sagan explained the universe. In Contact， he predicts its future -- and our own.

At first it seemed impossible - a radio signal that came not from Earth but from far beyond the nearest stars. But then the signal was translated, and what had been impossible became terrifying. For the signal contains the information to build a Machine that can travel to the stars. A Machine that can take a human to meet those that sent the message. They are eager to meet us: ...(展开全部)

In December， 1999， a multinational team journeys out to the stars， to the most awesome encounter in human history. Who -- or what -- is out there?In Cosmos， Carl Sagan explained the universe. In Contact， he predicts its future -- and our own.

La única novela que escribió, Carl Sagan imagina una gran aventura, el primer encuentro del hombre con otros seres inteligentes.

The noted family therapist presents innovative concepts and techniques conducive to changing one's habits of communication and to establishing open, constructive, and life-enhancing modes of contact and communication within family relationships

克里斯汀•鲁本,纽约国际摄影中心副馆长，曾出版《苏珊•梅瑟拉斯：历史》与《艾米利亚•厄尔哈特：图像与符号》。