## Search found 221 matches

- Wed Feb 27, 2008 6:19 am UTC
- Forum: Mathematics
- Topic: On the topic of series...
- Replies:
**11** - Views:
**1438**

### Re: On the topic of series...

For series that we "can't" find a "nice" form of the partial sums to take a limit... Well that's where the convergence tests come in. If you find that the series will converge you can have you computer add up the first 10^n terms and feel reasonably sure that your approximation i...

- Tue Feb 19, 2008 6:28 am UTC
- Forum: Mathematics
- Topic: Calculus is not math!
- Replies:
**27** - Views:
**4450**

### Re: Calculus is not math!

I try to encourage my classes to NOT memorize as many of the formulas as possible. After all a computer can handle the formulas, the person working on the computer needs to know other things.

- Fri Feb 15, 2008 5:14 am UTC
- Forum: Mathematics
- Topic: Pure Maths - putting it all together
- Replies:
**33** - Views:
**3563**

### Re: Pure Maths - putting it all together

A group of frenchman half a century ago or so writing under the name of (sp?) Nicholas Bourbaki wrote a series of a dozen or so books trying to build all (most) of mathematics from the bottom up. I've never read them but their fame still lives on so if this sort of thing interests you you might want...

- Fri Feb 08, 2008 6:23 am UTC
- Forum: Mathematics
- Topic: Trig Integral Help
- Replies:
**11** - Views:
**1797**

### Re: Trig Integral Help

It might help if you told us what course it is for so that we may gauge what type of method they are expecting you to use. On another note is 'n' supposed to be an integer? because I'm pretty sure that neither the factorial or gamma function is defined for negative integers and n-k will often be neg...

- Wed Feb 06, 2008 6:30 am UTC
- Forum: Mathematics
- Topic: Needing a new calculator... any advice?
- Replies:
**39** - Views:
**4120**

### Re: Needing a new calculator... any advice?

In regards to using a computer... If you don't want to shell out the cash (and/or have qualms about using a pirated version of mathmatica/maple etc.) There's a free mostly equivilent GNU program called Maxima http://maxima.sourceforge.net/ . Besides being a free download on any platform there are al...

- Mon Feb 04, 2008 5:17 am UTC
- Forum: Mathematics
- Topic: Comments needed in my plan of life on math
- Replies:
**9** - Views:
**1622**

### Re: Comments needed in my plan of life on math

At the school I did my masters at It was typically a 2 year program. Some people that either weren't as prepared from their undergrad, or that took a few years off before hand spent their first year taking (or retaking) some advanced undergrad courses. So they finished in 3 years instead of 2. So I ...

- Fri Feb 01, 2008 5:21 am UTC
- Forum: Mathematics
- Topic: Why do people dislike maths so much?
- Replies:
**258** - Views:
**29397**

### Re: Why do people dislike maths so much?

For instance, say you can do arithmetic with 99% accuracy. This might lead to being able to do fractions with a 95% accuracy. Then you'll be able to do an algebraic simplification with with about an 80% accuracy. So when you get to doing calculus you've got maybe a 50% accuracy. My personal experie...

- Thu Jan 31, 2008 11:45 pm UTC
- Forum: Mathematics
- Topic: Is 0 real?
- Replies:
**43** - Views:
**10507**

### Re: Is 0 real?

You're pondering is following quite a historic trail. The issues you raise are some of the reasons why "zero" came to be much much after the counting numbers of 1,2,3, etc... The Nothing that Is: A Natural History of Zero by Robert Kaplan is a nice little history of how zero came about. An...

- Thu Jan 31, 2008 11:10 pm UTC
- Forum: Mathematics
- Topic: Needing a new calculator... any advice?
- Replies:
**39** - Views:
**4120**

### Re: Needing a new calculator... any advice?

Huh? Are you talking about university level? That's very surprising if so. In my experience the very low-level classes are the only ones where you might possibly not be allowed a calculator. At both the school that I did my undergrad at, and at the one I'm currently teaching at classes like basic C...

- Thu Jan 31, 2008 5:18 am UTC
- Forum: Mathematics
- Topic: Volume from Area of Two Curves Question
- Replies:
**8** - Views:
**2078**

### Re: Volume from Area of Two Curves Question

The general form for computing the volume of a washer involves the radius's of the inner circle of the washer and the outer circle. When you rotate around something other than an axis that radius get's a little bit more complicated than just having r=f(x). Draw a picture of the two functions and als...

- Thu Jan 31, 2008 5:09 am UTC
- Forum: Mathematics
- Topic: Needing a new calculator... any advice?
- Replies:
**39** - Views:
**4120**

### Re: Needing a new calculator... any advice?

I can't speak for CS classes but I know that in doing my math and physics undergrad classes The HP 48 series worked well. Most of my Physics friends also had HP's and there is really little to no need for a calculator in most math classes. Really though it doesn't matter. Your 83 would do you fine. ...

- Mon Jan 28, 2008 6:48 am UTC
- Forum: Mathematics
- Topic: Work and Fluid Force -- Calculus Problem (Please help.)
- Replies:
**7** - Views:
**3119**

### Re: Work and Fluid Force -- Calculus Problem (Please help.)

The work section in the calc book we use (stewert) mixes lbs and kg amoungst their problems. So I always end up with a fair number of students that can't seem to keep straight the difference between mass and weight and they keep multipling unit's of lbs by g and getting some sort twice impacted by g...

- Tue Jan 22, 2008 9:36 pm UTC
- Forum: Mathematics
- Topic: The "what kind of maths do you do?" question.
- Replies:
**35** - Views:
**5596**

### Re: The "what kind of maths do you do?" question.

I multiple 6-digit numbers together. Next semester we're working on 7-digit numbers.

- Sun Jan 20, 2008 11:36 pm UTC
- Forum: Mathematics
- Topic: Amusing answers to tests
- Replies:
**393** - Views:
**61792**

### Re: Amusing answers to tests

They probably also stated "diagrams not to scale." When I teach trig material every time I want to add a diagram of a triangle on a test or quiz I use exactly the same picture of a triangle. I take perverse pleasure in having students solve for the angle that looks very acute, but which I...

- Thu Jan 17, 2008 8:24 am UTC
- Forum: Mathematics
- Topic: Assigning Personality to Numbers
- Replies:
**51** - Views:
**6387**

### Re: Assigning Personality to Numbers

Bassoon wrote:I'm rather partial to 144, myself. Dunno why.

I think that that is just gross.

- Thu Jan 10, 2008 6:32 am UTC
- Forum: Mathematics
- Topic: Math bloopers heard in math classes
- Replies:
**252** - Views:
**35865**

### Re: Math bloopers heard in math classes

BTW, your avatar is wrong ;). I think it's just using the lazy version of summation notation where "n=0" really means "n is the smallest positive integer that makes sense. I tend to use this (usually accidentally) multiple times each semester. It saves time when writing tests... Proo...

- Wed Jan 09, 2008 9:01 am UTC
- Forum: Mathematics
- Topic: Help on an integral...
- Replies:
**3** - Views:
**1269**

### Re: Help on an integral...

A quick google search gives you weierstrass substituions (which happen to be what the above person suggested) Try

http://planetmath.org/encyclopedia/WeierstrassSubstitutionFormulas.html

for a small bit on them.

http://planetmath.org/encyclopedia/WeierstrassSubstitutionFormulas.html

for a small bit on them.

- Mon Dec 24, 2007 8:11 pm UTC
- Forum: Mathematics
- Topic: Help with limits approaching infinity
- Replies:
**14** - Views:
**2639**

### Re: Help with limits approaching infinity

Not to mention it costs you some points when you're first learning the material. A few sections/chapters/ or classes later "shortcuts" of "oh I know the answer is this because of some 'highest power of x' stuff" In general your teacher(s) will let you know when its "okay&quo...

- Mon Dec 17, 2007 5:57 am UTC
- Forum: Mathematics
- Topic: Favorite math jokes
- Replies:
**1452** - Views:
**493733**

### Re: Favorite math jokes

Here's a "classic" groaner

What does a mathematician do when he's constipated? ... works it out with a pencil.

What does a mathematician do when he's constipated? ... works it out with a pencil.

- Sun Dec 16, 2007 12:02 pm UTC
- Forum: Mathematics
- Topic: TI-Nspire
- Replies:
**51** - Views:
**8798**

### Re: TI-Nspire

I think I'll stick with the good ol' hp48. RPN forever.

- Sun Dec 16, 2007 11:57 am UTC
- Forum: Mathematics
- Topic: How would you simplify this
- Replies:
**24** - Views:
**2334**

### Re: How would you simplify this

I feel that the actual answer should be in the lines of an essay discussing how ill-posed the question is. In short to actually be able to "Simplify" one needs a context. Without knowing what the expression is to be used for this may already be the "simplest" form. For example co...