Re: Maths- Gym for Brainiacs

by Babun Wed Sep 12, 2012 11:18 am

kiranr wrote:
3-------3
----3----
3---3---3
----3----
3------3

by mr-r34 Thu Oct 11, 2012 2:35 pm

Does anybody want to get a financial boner and do my Finance assignment =], or provide any advice lol

by RealGunner Thu Oct 11, 2012 3:29 pm

That's not maths :coffee:

What's the assignment on ?

by mr-r34 Thu Oct 11, 2012 3:37 pm

Asset Allocation for a Superannuation Fund

by Dutti Fri Oct 12, 2012 6:09 pm

vizkosity wrote:
beatrixasdfghjk. wrote:What sort of places hire physicists and mathematicians?

many places

mathematicians are extremely logical, and smart at what they are doing. They tend to have a very good logic/order/ yet abstract enough to think differently.

I always hate the word abstract here as it doesn't explain anything. Personally and informally, I prefer the term "general".

There is a reason why "abstract algebra" is also known as "universal algebra" because the language and all the results in the field can be applied to many other fields of mathematics.

Hence, why I dislike the term "abstract". On the other hand, the term "general" (even though informal) gives a somewhat clearer sense to the listener.

by Dutti Fri Oct 12, 2012 6:15 pm

Babun wrote:
Moral of the story:

Physicists use maths concepts without really understanding the core
( It's a joke, no offence)

Engineers are even worse. Laughing

by Ganso Thu Dec 06, 2012 10:01 pm

Wow last post was in october lol

guys,I need some help on a really easy subject,i was daydreaming on this part of class.What is an Elementary matrix?be simple pls

by Babun Fri Dec 07, 2012 12:27 am

If you change one element or exchange two rows of an unit matrix by addition you get an elementary matrix.

by El Gunner Fri Dec 07, 2012 10:15 am

Maths... Used to like this shit in primary school.. Nuff said...

by RealGunner Fri Dec 07, 2012 2:40 pm

Babun wrote:If you change one element or exchange two rows of an unit matrix by addition you get an elementary matrix.

Which level of maths is that ?

by urbaNRoots Fri Dec 07, 2012 2:49 pm

Advanced Algebra.

by Babun Fri Dec 07, 2012 5:23 pm

urbaNRoots wrote:Advanced Algebra.

Basic algebra... We're talking about a definition.

by RealGunner Fri Dec 07, 2012 5:50 pm

We never did this and i did Advanced Algebra lol

by Babun Fri Dec 07, 2012 10:08 pm

RealGunner wrote:We never did this and i did Advanced Algebra lol

Want a really good book about linear algebra?

by RealGunner Sat Dec 08, 2012 12:33 am

Yea sure, got holidays coming up so why not Very Happy

by Babun Sat Dec 08, 2012 8:18 am

RealGunner wrote:Yea sure, got holidays coming up so why not

http://www.file-upload.net/download-6901237/book.rar.html

Reading books on holidays, what a freak eco smile

PW is in your PM box.

by RealGunner Sat Dec 08, 2012 1:01 pm

thanks lol.

by Ganso Sat Dec 08, 2012 7:30 pm

Thanks Babs,I already got it yesterday.

this is not advanced algebra, im on second week of engineering,doing linear algebra/analytic geometry I.

So far im struggling in physics and calculus and doing pretty well in algebra,we are just viewing Matrix and Linear Systems.I would be doing pretty well like everybody else if I hadn't studied in those shitty US high schools who teach elementary school topics for 18 year olds

I got 3 projects and a list of 100 exercises in my first week Mad

my friends are doing the projects for me though :coffee:

by Guest Mon Dec 10, 2012 7:41 am

Got 200 problems on differential equations to solve within 3 days.

by RealGunner Mon Dec 10, 2012 7:04 pm

you didn't actually get 3 days to do it did you ?

by vizkosity Wed Dec 12, 2012 3:09 am

mary Boas is the best book i can find for linear algebra and complex number analysis.

got raped in mathematical physics/thermo stats mech and quantum mech though

by Babun Sun Mar 31, 2013 11:09 pm

A practical question... After a city map is used there multiple ways to fold it back depending on the numbers of colums. If you've got 2 columns there're only two ways to fold your map. If you've got 3 the matter gets complicated:

Maths- Gym for Brainiacs - Page 26 La8j9vuc

Maths- Gym for Brainiacs - Page 26 La8j9vuc

A map with 3 columns. Let's see how many possibilities to fold exist:
Maths- Gym for Brainiacs - Page 26 M33d9mxo

Maths- Gym for Brainiacs - Page 26 Mdcmggzm

As you see there're 6 possibilities to fold the map or better said 3!

The question: How many possibilities exist for a map with 4 columns? :whistle:

Maths- Gym for Brainiacs - Page 26 Xrsa2rgq

How about six? albino

Maths- Gym for Brainiacs - Page 26 Ygegztah

How about being a smartass and solving the problem for n columns?! affraid

Have fun

by kiranr Mon Apr 01, 2013 1:56 am

I think this is about arranging each column in a sequence.

So for 2 columns, there are 2! = 2 ways. For 3 columns, there are 3! = 6 ways. For 4 columns, there are 4! = 24 ways. For 6 columns there are 6! = 720 ways. For n columns, there are n! ways.

by spanky Mon Apr 01, 2013 3:19 am

kiranr wrote:
I think this is about arranging each column in a sequence.

So for 2 columns, there are 2! = 2 ways. For 3 columns, there are 3! = 6 ways. For 4 columns, there are 4! = 24 ways. For 6 columns there are 6! = 720 ways. For n columns, there are n! ways.

im gonna sign this post with a gif

Maths- Gym for Brainiacs - Page 26 B7H1K

by alexander mahone Mon Apr 01, 2013 10:36 am

Is it really that many ways for 4 columns? I don't see it, lol, maybe I'm seeing it wrong. I tried to just expanding from the result for 3 columns to get the numbers of ways for 4 columns. So something like this:
Maths- Gym for Brainiacs - Page 26 Tes12

Maths- Gym for Brainiacs - Page 26 Tes12

I only see 3 ways to put the column 4 if the column 3 is at the very top or bottom. And there are only 2 ways to put the column 4 if the column 3 is sandwiched between column 1 and 2. Column 3 is on the top twice, on the bottom twice and being sandwiched twice. Hence I only see (3 x 4) + (2 x 2) = 16 ways for 4 columns. What are another 8 ways for 4 columns that I missed?

by Babun Mon Apr 01, 2013 11:20 am

kiranr wrote:
I think this is about arranging each column in a sequence.

So for 2 columns, there are 2! = 2 ways. For 3 columns, there are 3! = 6 ways. For 4 columns, there are 4! = 24 ways. For 6 columns there are 6! = 720 ways. For n columns, there are n! ways.

spanky wrote:
kiranr wrote:
I think this is about arranging each column in a sequence.

So for 2 columns, there are 2! = 2 ways. For 3 columns, there are 3! = 6 ways. For 4 columns, there are 4! = 24 ways. For 6 columns there are 6! = 720 ways. For n columns, there are n! ways.

im gonna sign this post with a gif

You didn't think the question would be this easy? Am I known for easy questions? eco smile

alexander mahone wrote:Is it really that many ways for 4 columns? I don't see it, lol, maybe I'm seeing it wrong. I tried to just expanding from the result for 3 columns to get the numbers of ways for 4 columns. So something like this:
Spoiler:

I only see 3 ways to put the column 4 if the column 3 is at the very top or bottom. And there are only 2 ways to put the column 4 if the column 3 is sandwiched between column 1 and 2. Column 3 is on the top twice, on the bottom twice and being sandwiched twice. Hence I only see (3 x 4) + (2 x 2) = 16 ways for 4 columns. What are another 8 ways for 4 columns that I missed?

Absolutely right!
+1 for 4 column version cheers

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