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#2 Re: Help Me ! » Need help with building a Curriculum » 2018-01-13 23:01:02

I suggest you read books one by one.
Today's textbooks are very concise, and you can learn most topics up to undergraduate level on your own

#3 Re: Help Me ! » Arithmetic and Geometric Sequences » 2018-01-13 22:58:26

Note the common ratio is a complex number.

#4 Re: Dark Discussions at Cafe Infinity » Breathing Trouble while Meditation » 2018-01-13 22:55:58

Uh it is surprising to find so many mathematicians practice meditation!

#6 Re: Help Me ! » Matrix inverse proof » 2017-12-25 01:57:29

AX =  X diag( 入i )

V := X^(-1)

AX diag( 1/ 入i )V  =  X diag( 入i )diag( 1/ 入i ) V  = I

thus


A^(-1) =  X diag( 1/ 入i ) X^(-1)

#7 Re: Coder's Corner » Python: moving on up? » 2017-12-25 01:33:22

I believe you should use some web based GUI to ease the visit of your application.
Try JavaScript.

#8 Re: Help Me ! » Normal Probability Integration » 2014-01-01 01:07:20

bobbym wrote:

Doesn't that have two parameters not one? That is why I asked.

Normsdist in Microsoft Excel

#9 Re: Help Me ! » Normal Probability Integration » 2014-01-01 00:49:10

bobbym wrote:

Hi;

What is N?

Normal Probability Distribution Function

#11 Re: Help Me ! » Normal Probability Integration » 2013-12-31 14:23:44

bobbym wrote:

Hi;

I do not think those are doable.

Yes, they are. Recall Normal probability distribution, please.

#13 Re: Help Me ! » Normal Probability Integration » 2013-12-30 22:21:05

bobbym wrote:

Hi;

What is d?

d is the differential operator

#14 Re: Help Me ! » Normal Probability Integration » 2013-12-30 22:16:59

After this change of variable, I think now the question is easier.

#16 Re: Help Me ! » Normal Probability Integration » 2013-12-29 01:11:53

Sorry guys, I made a mistake, the question should be:

#17 Re: Help Me ! » Normal Probability Integration » 2013-12-15 15:25:05

bobbym wrote:

A different integration?

I have found a way to integrate this directly, but it is very tricky.

#18 Re: Help Me ! » Normal Probability Integration » 2013-12-14 15:59:14

There actually is closed form, but through a different integration.

#20 Re: Help Me ! » √1+(√2+(√3+(√4+... = ? Harder than it seems » 2013-12-14 15:55:18

Actually, the answer is 3
Look at this poster before 2013 Asian Football Championship, the score will be 3:0
9CRN7PE44FFD0005.jpg

#21 Re: Help Me ! » Conditional Statement » 2013-11-28 01:57:45

Let me explain conditional statement via set arguments.

If you know A is true for sure, and you can immediately infer that B is true.
A is true is sufficient condition that B is true.
We can also say that the event A is true is contained in the event B is true.
Like you are in London implies that you are in UK. But the other way around is not necessarily true.

and we can say B is necessary condition for A, for notB is in notA - you are not in UK so you are not in London.

Hope this theory make your logic class a lot easier!

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