[問題] 請問有關Multipole Expansion
想要請問一下電磁學當中，
有個叫做Multipole Expantion的東西，
我的問題在Griffith的P147頁，
他說
藉由binomial expansion，
-1
-
1 2 1 1 3 5
-(1+ε) =-(1- -ε+ -ε^2- -- ε^3...... )
r r 2 8 16
不過這一步我一直想不太通，
不知道他是怎麼展開的？
有人可以跟我說明一下甚麼是binomial expansion嗎？
感謝你^_________________^
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