Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

You are not logged in.

- Topics: Active | Unanswered

**anonimnystefy****Real Member**- From: Harlan's World
- Registered: 2011-05-23
- Posts: 16,030

hi bobbym

found out that it should be equal to 1/e.

Here lies the reader who will never open this book. He is forever dead.

Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment

The knowledge of some things as a function of age is a delta function.

Offline

**anonimnystefy****Real Member**- From: Harlan's World
- Registered: 2011-05-23
- Posts: 16,030

Solved it!!!

*Last edited by anonimnystefy (2011-06-28 10:38:17)*

Here lies the reader who will never open this book. He is forever dead.

Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment

The knowledge of some things as a function of age is a delta function.

Offline

**gAr****Member**- Registered: 2011-01-09
- Posts: 3,479

Hi all!

Hi bobbym,

In post #48, were you talking about question 6?

Hi anonimnystefy,

That's correct, very good! Hide your answer!

"Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense" - Buddha?

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

Offline

**gAr****Member**- Registered: 2011-01-09
- Posts: 3,479

**7)**

"Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense" - Buddha?

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

Offline

**bobbym****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 108,595

Hi gAr;

Yes, they are doing a strange thing on some of those. Bringing the limit not only through the tangents which is sometimes okay. They are bringing it up to the exponent.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

**Online**

**gAr****Member**- Registered: 2011-01-09
- Posts: 3,479

Hi bobbym,

I use some "standard" results.

It's useful if someone doesn't know differentiation.

We can apply these if we can reduce to these forms.

But I did not understand what you actually meant!

What would be your approach?

"Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense" - Buddha?

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

Offline

**bobbym****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 108,595

Hi;

I noticed maple in their student package solving like this:

Apply power rule.

L'Hospitals rule.

Now what is that?

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

**Online**

**reconsideryouranswer****Member**- Registered: 2011-05-11
- Posts: 171

gAr wrote:

2)

Problem:

Let A = (1 + 1/2 + ... + 1/n)

Let B = [1/(n + 1) + 1/(n + 2) + ... + 1/(n + n)]

Let C = A + B

Then B = C - A

Signature line:

I wish a had a more interesting signature line.

Offline

**gAr****Member**- Registered: 2011-01-09
- Posts: 3,479

Hi reconsideryouranswer,

That's correct, very good!

Thanks for your solution.

Hi bobbym,

Did it mean to say answer is 1?!

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

Offline

**bobbym****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 108,595

I guess?! I do not get why he brings the limit operator into the exponent!

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

**Online**

**gAr****Member**- Registered: 2011-01-09
- Posts: 3,479

That's bad of them, misleading the students!

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

Offline

**bobbym****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 108,595

Does it on every one I tried with an exponent. Freaky bad move!

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

**Online**

**gAr****Member**- Registered: 2011-01-09
- Posts: 3,479

So it means even

?

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

Offline

**bobbym****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 108,595

Yes, it is the new math. It certainly simplifies things.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

**Online**

**gAr****Member**- Registered: 2011-01-09
- Posts: 3,479

Hmmm, has anyone reported it to maple?

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

Offline

**bobbym****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 108,595

Hi;

That is the funny thing. No one has. No software is perfect but this is too much.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

**Online**

**123ronnie321****Member**- Registered: 2010-09-28
- Posts: 128

Hi gAr,

Nice and well explained solution to Post no. 23.

My attempt at **7**

*Last edited by 123ronnie321 (2011-06-29 19:35:14)*

Offline

**gAr****Member**- Registered: 2011-01-09
- Posts: 3,479

Hi 123ronnie321,

That's correct, good job!

*Last edited by gAr (2011-06-28 21:59:45)*

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

Offline

**gAr****Member**- Registered: 2011-01-09
- Posts: 3,479

Hi bobbym,

Missed your post aagain!

Yes, it's funny indeed.

Have you checked the other versions of maple?

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

Offline

**bobbym****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 108,595

Hi;

As far as I know it occurs in 12,13 and 14. It is not part of the main package but it is part of student package.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

**Online**

**gAr****Member**- Registered: 2011-01-09
- Posts: 3,479

Hi bobbym,

Are the main packages doing fine?

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

Offline

**bobbym****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 108,595

Yes, it is a good package. On some other forums they knock CAS. They are quick to point out when they make a mistake and forget the 1000 times they are right. That type of reasoning is bad.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

**Online**

**gAr****Member**- Registered: 2011-01-09
- Posts: 3,479

Hi bobbym,

Yes, people never remember good things and never forget bad things!

Anyway, such an obvious mistake is hard to digest.

Could it be a problem with the installation?!

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

Offline

**bobbym****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 108,595

I do not think so. I just think whomever wrote that module for them has a weird understanding of limits. Let me show you another one:

http://www.mathisfunforum.com/viewtopic.php?id=12832

Post #1

Post #4

Post #9

This was also done by that module.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

**Online**

**anonimnystefy****Real Member**- From: Harlan's World
- Registered: 2011-05-23
- Posts: 16,030

hi all

could anyone explain how 123ronnie321 got:

*Last edited by anonimnystefy (2011-06-29 01:18:40)*

Here lies the reader who will never open this book. He is forever dead.

Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment

The knowledge of some things as a function of age is a delta function.

Offline