看看網頁內的定義(definitions)吧
http://en.wikipedia.org/wiki/E_%28mathematical_constant%29#Definitions
#ed_op#DIV#ed_cl#那e的定義呢??#ed_op#/DIV#ed_cl#lcflcflcf 寫到:Euler's formula:e^ix=cosx+isinx#ed_op#BR#ed_cl#Put x=pi, e^ipi=1+0#ed_op#BR#ed_cl#=>e^ipi-1=0#ed_op#BR#ed_cl#代表了三個數的完美結合XXD#ed_op#BR#ed_cl##ed_op#BR#ed_cl#Reference:#ed_op#BR#ed_cl#http://en.wikipedia.org/wiki/E_%28mathematical_constant%29#ed_op#BR#ed_cl#http://en.wikipedia.org/wiki/Euler%27s_formula