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作者 ex951753 在 PTT [ Math ] 看板的留言(推文), 共39則

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[微積] 證明

[ Math ]13 留言, 推噓總分: +4

作者: nobrother - 發表於 2013/11/25 15:03(12年前)

4^F→ex951753:f(x+y)=f(x)+f(y) for ev x, y in R11/25 17:11

5^F→ex951753:跟 f(x)=k , for ev x in R 擺在一起不就 k=2*k =0?11/25 17:12

7^F→ex951753:所以題目就不對了嘛證不出來合情合理不用太在意11/25 17:39

[微積] 數列極限

[ Math ]9 留言, 推噓總分: +1

作者: tommy10127 - 發表於 2013/11/20 19:50(12年前)

1^F推ex951753:用國中生的方法上底加下底乘高除二真的加出來啊11/20 20:46

2^F→ex951753:A_n=(sqrt(2)+sqrt(2n))/211/20 20:47

4^F→ex951753:rho_n=(sqrt(2+2n-4sqrt(n)))/211/20 20:54

5^F→ex951753:對耶開根號就不是等差了耶你好聰明喔 O_O11/20 20:54

6^F→ex951753:那平方再開根號這樣裡面就等差再差一個O(sqrt(2n))11/20 20:59

7^F→ex951753:不過我寫一寫是零捏11/20 21:06

8^F→ex951753:不對分子分母放反了所以我寫的是無限大11/20 21:11

[微積] 請教一題數列遞增性證明

[ Math ]6 留言, 推噓總分: 0

作者: rfvbgtsport - 發表於 2013/11/14 02:39(12年前)

1^F→ex951753:歸納法答案是211/14 04:50

2^F→ex951753:define * = ^(1/2)11/14 04:52

3^F→ex951753:(2+2*)* > x*11/14 04:52

4^F→ex951753:suppose ak+1 > ak11/14 04:53

5^F→ex951753:ak+2 = (2+ak+1)* > (2+ak)* = ak+1 QED11/14 04:54

[微積] 可微分性

[ Math ]42 留言, 推噓總分: +7

作者: nobrother - 發表於 2013/11/13 15:46(12年前)

3^F→ex951753:http://imgur.com/pThubXB11/13 18:01

4^F→ex951753:最後同理整個分子取norm 則可改寫為 =0 in R^111/13 18:02

[中學] 國中幾何證明

[ Math ]3 留言, 推噓總分: 0

作者: newperson - 發表於 2013/11/12 14:34(12年前)

3^F→ex951753:中線左右長度相等用兩次三角不等式畫圖最快11/12 17:06

[微積] 求細圓弧質心與圓心的距離

[ Math ]7 留言, 推噓總分: +1

作者: sisvdk - 發表於 2013/11/12 13:52(12年前)

7^F→ex951753:r cos theta?11/12 16:59

Re: [線代] direct sum

[ Math ]5 留言, 推噓總分: 0

作者: cmrafsts - 發表於 2013/11/11 18:57(12年前)

1^F→ex951753:dim(W1)=n*n-n dim(W1 intersec W2)=(n*n-n)/211/12 18:19

2^F→ex951753:dim(W1+W2)=dim(W1)+dim(W2)-dim(W1 intersec W2)=n^11/12 18:23

3^F→ex951753:211/12 18:23

4^F→ex951753:你硬湊的東西叫做 internal direct sum11/12 18:29

5^F→ex951753:才會要求 W1 intersec W2 = zero matrix11/12 18:32

[代數] 有限群

[ Math ]13 留言, 推噓總分: +1

作者: kororoDX - 發表於 2013/10/23 23:07(12年前)

4^F→ex951753:every element in G can generate a cyclic subgp of10/24 01:58

5^F→ex951753:G. the # of subgp is finite therefore G is of10/24 02:00

6^F→ex951753:finite order10/24 02:00

[微積] 雙變數微分

[ Math ]2 留言, 推噓總分: 0

作者: prc77 - 發表於 2013/09/10 20:03(12年前)

1^F→ex951753:解答的分子分母沒有顛倒了嗎= =09/11 16:16

2^F→ex951753:沒顛倒是我化簡為簡分數09/11 16:20

[代數] 有關代數的幾個問題

[ Math ]8 留言, 推噓總分: +1

作者: jas0205 - 發表於 2013/06/14 12:54(12年前)

7^F→ex951753:1. ditto 2a. irreducible => degree=7 2b. yes06/14 13:13

8^F→ex951753:2b. no. {ax^2+bx+c|a,b,c in Z_3}06/14 13:15

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