Forgot password?
 Register account
View 842|Reply 2

积分上限函数

[Copy link]

81

Threads

165

Posts

1645

Credits

Credits
1645

Show all posts

APPSYZY Posted 2019-3-18 13:11 |Read mode
函数$f(x)$满足什么条件才能使得下面的等式恒成立呢?\[\int_0^xf(t)\mathrm{d}t=\int f(x)\mathrm{d}x\]

46

Threads

323

Posts

2834

Credits

Credits
2834

Show all posts

业余的业余 Posted 2019-3-21 07:40
回复 1# APPSYZY

应该没有这样的条件。不妨说 $f(x)$ 的原函数(之一) 是 $F(x)$, 显然,左边是 $F(x)-F(0)$ 是一个函数, 右边是 $F(x)+C$ 是一组差为某个常数的函数。左边是一个元素,右边是一个无穷集合。

2

Threads

15

Posts

191

Credits

Credits
191

Show all posts

orzweb111 Posted 2019-3-24 07:33
回复 1# APPSYZY


You are right. For the equation, the left side is a function of x, while the right side is a collection of functions differed with a constant.

The question doesn't make much sense.

Mobile version|Discuz Math Forum

2025-6-5 18:16 GMT+8

Powered by Discuz!

× Quick Reply To Top Edit