# 間時間表 2

Pure Maths 9

Past papers 23

（LWT：是呀。我上課時，不是在留心聽課，而是在追功課。）

 30 minutes Pure Maths: Assignment 10 30 minutes Pure Maths: Assignment 10 30 minutes Pure Maths: Assignment 10 30 minutes Pure Maths: Assignment 10 __________ _________________________ 30 minutes Pure Maths: Assignment 2 30 minutes Pure Maths: Assignment 2

— Me@2010.04.28

# Second superstring revolution

The second superstring revolution was the intense wave of breakthroughs in string theory that took place approximately between 1994 and 1997.

The different versions of superstring theory were unified, as long hoped, by new equivalences. These are known as S-duality, T-duality, U-duality, mirror symmetry, and conifold transitions. The different theories of strings were also connected to a new 11-dimensional theory called M-theory.

New objects called branes were discovered as inevitable ingredients of string theory. Their analysis – especially the analysis of a special type of branes called D-branes – led to the AdS/CFT correspondence, the microscopic understanding of the thermodynamic properties of black holes, and many other developments.

— Wikipedia on Second superstring revolution

2010.04.28 Wednesday ACHK

# 小國大業：荷蘭

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17世紀，只有150萬人口的荷蘭，成為世界經濟中心和海上第一強國。

— 大國崛起, 維基百科

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2010.04.28 Wednesday $ACHK$