Summary of the subject (topics) 1. Brief review of probability a. Example applications 2. Brief review of random variables a. Example applications 3. Brief review of random processes a. Classical description b. State space description
1 Streaks someone tapping the H and t keys in a what felt like a random way?0 Nas the table of H's and T's below generated by flipping a fair coin 100 times
Object: to describe the fieds generated by electric charges and currents Mathematical tools A field is a function describing a quantity at all points in space
由于晶格具有周期性,一些物理量具有周期性,如势能函数: ( ) ( ) 1 1 2 2 3a3 V x V x l a l a l K K G G G = + + + —— 如图 XCH_001_024 所示,A 和 A’两点势能相同。 —— 势能函数是以 1 2 3 a , a , a G G G 为周期的三维周期函数 引入倒格子,可以将三维周期性函数展开为傅里叶级数