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[微積] 底數為x的對數微分

[ Math ]20 留言, 推噓總分: +7

作者: deardidi - 發表於 2022/08/28 11:46(1年前)

18^F推jacky7987: 一定是 log 三個字母, ln 兩個字母，比較好寫（誤08/29 15:28

[中學] x除以零為什麼不等於x

[ Math ]33 留言, 推噓總分: +6

作者: meblessme - 發表於 2022/04/28 02:04(2年前)

30^F推jacky7987: x/0 一直都是無定義，而不是無限大04/29 14:58

[分析] Rudin Thm 6.10 的不連續點可以無限多嗎?

[ Math ]14 留言, 推噓總分: +3

作者: alan23273850 - 發表於 2021/12/18 21:45(2年前)

1^F推jacky7987: 黎曼可積跟不連續點零測度等價，可數一定是0測度，12/18 23:10

2^F→jacky7987: 大概是這樣。但要看你們教授有沒有要帶這個定理。12/18 23:10

12^F推jacky7987: 哦哦對誒，alpha可能要更好一點，沒看到是R-S積分12/20 09:15

13^F→jacky7987: 大概alpha C^1 是第一定會對，AC就不知道了12/20 09:16

[中學] 如何求log(199/200)近似值?

[ Math ]1 留言, 推噓總分: +1

作者: waterbear963 - 發表於 2021/12/03 12:05(2年前)

1^F推jacky7987: log(1-x)=-x-x^2/2-x^3/3-...，看你精度到哪邊12/03 13:48

[機統] 想問何謂「可容忍誤差」

[ Math ]27 留言, 推噓總分: +1

作者: pennyleo - 發表於 2021/11/25 15:02(2年前)

13^F推jacky7987: 就看這篇的回答大概就知道大家的容忍度不一樣11/26 12:58

[中學] log(n)次方表示法問題

[ Math ]7 留言, 推噓總分: +7

作者: u9527 - 發表於 2021/06/30 03:19(2年前)

3^F推jacky7987: 我傾向下面的，因爲log(n^n)我會寫 n*logn XDDDD07/01 19:21

[線代] 暑假複習規劃請益

[ Math ]7 留言, 推噓總分: +3

作者: watermeter - 發表於 2021/06/26 00:29(2年前)

6^F推jacky7987: 純商科的話應該注重矩陣運算、分解就好06/26 10:56

[線代] T為W的垂直投影則I-T在W^perp也是

[ Math ]26 留言, 推噓總分: +6

作者: znmkhxrw - 發表於 2021/06/18 19:05(2年前)

8^F推jacky7987: 你Range是close subspace 但你的W不是阿，他不會一06/18 20:57

9^F→jacky7987: 樣06/18 20:57

10^F推jacky7987: 阿基本上你要討論perp的時候就要考慮V是Hilbert06/18 20:59

15^F推jacky7987: V=l^2, W考慮有限位子非0 大概都是這個反例（顯示為06/18 21:12

16^F→jacky7987: 沒算06/18 21:12

19^F→jacky7987: 但我猜R(P_W)應該是006/18 21:12

21^F推jacky7987: 哦哦那T存在就強迫W是closed這件事情沒錯06/18 21:22

22^F→jacky7987: 我原本以為你可以允許W包含於R(P)06/18 21:23

[線代] 內積

[ Math ]10 留言, 推噓總分: +4

作者: kbolm - 發表於 2021/05/12 02:48(3年前)

5^F推jacky7987: 你變數代換一下 x=-u，然後用奇偶函數的性質05/12 10:15

[微積] 想問E(x^4)，x為常態分佈怎麼算

[ Math ]15 留言, 推噓總分: +3

作者: keyesleo - 發表於 2021/05/06 14:40(3年前)

1^F推jacky7987: 動差05/06 15:22

4^F推jacky7987: 常態母函數可以算吧，就微四次就好了05/06 16:37

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