作者PaulErdos (My brain is open)
看板trans_math
标题Re: [考古] 瑕积分
时间Tue Jun 9 02:36:35 2009
※ 引述《GLP (^__________^)》之铭言:
: find all values of p,q ﹙- R such that the improper integral
: ∞ x^p
: ∫ ----- dx is convergent.
: 0 1+x^q
∞ dx
= ∫ ─────
0 -p q-p
x + x
if q > 0
convergent, if q-p > 1
then {
divergent , if q-p ≦ 1
if q ≦ 0
convergent, if -p > 1
then {
divergent , if -p ≦ 1
=>
if q > 0 and q > 1+p
or q ≦ 0 and p < -1 ,
p
∞ x dx
∫ ──── is convergent .
0 q
1 + x
--
※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 140.112.243.42
1F:推 midarmyman:这份考古题有解答吗? 140.117.198.78 06/09 15:14
2F:推 midarmyman:第一题答案多少? 140.117.198.78 06/09 15:19