Quote:

Original post by Sagar_Indurkhya

2) What is the most beautiful equation you have ever seen? Explain.

Most beautiful equation? My hat's going in the ring for general relativity:

G

_{μν}= 8

*π*· GT

_{μν}

Started by Feb 08 2005 11:19 AM

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81 replies to this topic

Posted 09 February 2005 - 10:28 AM

Quote:

Original post by furby100Quote:

Original post by Sagar_Indurkhya

2) What is the most beautiful equation you have ever seen? Explain.

x=2. This equation is satisfied by 2. It follows that there are numbers that satisfy the equation x = 2. From that, it follows that there are numbers. From this simple equation one can settle one of the deepest philosophical questions about mathematics. Certainly a beautiful result.

However, it's almost certain most people will put e^{ip}+ 1 = 0

never seen that one. What is it?

Posted 09 February 2005 - 10:29 AM

Quote:

Original post by Sagar_IndurkhyaQuote:

Original post by furby100

However, it's almost certain most people will put e^{ip}+ 1 = 0

never seen that one. What is it?

Posted 09 February 2005 - 11:50 AM

Quote:

Original post by JexMX

What came first, the chicken or the egg?

The egg, of course. The first bird genetically close enough to today's chicken to be considered a chicken was a chicken for its entire life (as in, it didn't suddenly turn into a chicken halfway through its life). That means it was born from an egg, a chicken egg.

Posted 10 February 2005 - 11:04 AM

I'd say the chicken. If a non-chicken lays an egg, it's not a chicken egg. What came out was a chicken, but it wasn't supposed to be, so it wasn't a chicken egg, it was a mutated relative-of-chicken egg... So the first chicken egg had to come from a chicken, but the first chicken can come from a mutated Dodo egg.

Posted 10 February 2005 - 11:30 AM

Quote:So, you say that the egg type is defined by what pooped out the egg, and not what's in the egg. Still, the question is whether the egg preceded the chicken. I don't think it matters what type of egg, just that there was indeed an egg directly related to the first chicken, that indeed preceded it.

Original post by Stonicus

I'd say the chicken. If a non-chicken lays an egg, it's not a chicken egg. What came out was a chicken, but it wasn't supposed to be, so it wasn't a chicken egg, it was a mutated relative-of-chicken egg... So the first chicken egg had to come from a chicken, but the first chicken can come from a mutated Dodo egg.

I say egg came first.

Posted 28 March 2011 - 10:46 AM

A while back I myself had a series of phone interviews with Google, the following were a few of the questions they asked, and we were allowed to ask questions as well:

- There exists a file directory containing at least 55 thousand plaintext documents. Some of those documents contain phone numbers that are out of date. Given a list of invalid phone numbers and their new, updated equivalents, how would you go about updating all invalid phone numbers within all files within the directory?
- Write an algorithm that performs a binary search on a sorted, but rotated array of integers.
- Compare and contrast various data structures utilized across multiple programming languages: Hashtable, Hashmap, Treemap, etc.

Posted 29 March 2011 - 06:38 AM

x=2. This equation is satisfied by 2. It follows that there are numbers that satisfy the equation x = 2. From that, it follows that there are numbers. From this simple equation one can settle one of the deepest philosophical questions about mathematics. Certainly a beautiful result.

However, it's almost certain most people will put e^{ip}+ 1 = 0

What about x=0? That has the same as above, but adds in that there is some number representing no quantity at all.

On the blender:

http://www.realkato.com/blog.php?pid=857

If you suppose that it were somehow physically possible to shrink yourself to that size without diminishing your normal human capabilities, then you should consider that your strength (a function of the area of your cross-section, proportional to the square of your height) has been reduced about 4900 times, but your

mass(a function of your volume, proportional to the cube of your height, given that your density remains the same) has been reduced 343000 times. If you currently have a 24-inch vertical leap, you'dstillhave a 24-inch vertical leap regardless of how small you became. So given those facts, you could simplyjumpout of the blender.

Another interesting thing to note: you'd actually have what seems to be 70 minutes to come up with the solution, because time would travel 70 times slower for you at that size. The speed of light and the speed of electrons is constant, but when you're tiny, photons and electrons have less distance to travel.

Posted 29 March 2011 - 11:52 AM

What is a rotated array?but rotated array of integers.

A rotated array is an array where the first piece of data might not be the first element.

ex: [4,5,1,2,3] would be a sorted rotated array.

edit: as far as writing a binary search on it, you could just write a function to translate their element index into their data index and perform a binary search using that function to access the elements the way you would normally do a binary search. Not sure if that's the optimal solution, but it seems to be the simplest on my mental state atm.

double edit: I think it's actually better to find where your array gets split, then run a binary search on the half that should contain the element. Since you have to search for the spot where it's split anyway, this uses that step to also eliminate some of the elements before starting the binary search even starts.

Posted 29 March 2011 - 01:44 PM

Binary search has worst-case O(logn).ex: [4,5,1,2,3] would be a sorted rotated array.

edit: as far as writing a binary search on it, you could just write a function to translate their element index into their data index and perform a binary search using that function to access the elements the way you would normally do a binary search. Not sure if that's the optimal solution, but it seems to be the simplest on my mental state atm.

double edit: I think it's actually better to find where your array gets split, then run a binary search on the half that should contain the element. Since you have to search for the spot where it's split anyway, this uses that step to also eliminate some of the elements before starting the binary search even starts.

Finding split point is O(n), so finding the point of rotation is several times more expensive than search itself.

Since array is sorted, recursive split can be used to determine which half is out of order. Predicates for binary search are: left < mid < right (equalities optional)

In example above, we have:

left = 4

mid = 1

right = 3

There are now two intervals, left and right. Determine which is correct and which is incorrect.

Instead of usual binary search, which tests against midpoint, test against intervals. Does x lie in correct interval? If yes, perform regular binary search. If no, repeat the above.

This has same complexity as regular binary search and it avoids finding the pivot/rotation point, meaning array could be rotated arbitrarily between searches. A practical application could be something like set of indexed data or time series in a ring buffer.

Posted 31 March 2011 - 01:19 PM

I thought since the light has less distance to travel, things would seem faster.....x=2. This equation is satisfied by 2. It follows that there are numbers that satisfy the equation x = 2. From that, it follows that there are numbers. From this simple equation one can settle one of the deepest philosophical questions about mathematics. Certainly a beautiful result.

However, it's almost certain most people will put e^{ip}+ 1 = 0

What about x=0? That has the same as above, but adds in that there is some number representing no quantity at all.

On the blender:

http://www.realkato....log.php?pid=857If you suppose that it were somehow physically possible to shrink yourself to that size without diminishing your normal human capabilities, then you should consider that your strength (a function of the area of your cross-section, proportional to the square of your height) has been reduced about 4900 times, but your

mass(a function of your volume, proportional to the cube of your height, given that your density remains the same) has been reduced 343000 times. If you currently have a 24-inch vertical leap, you'dstillhave a 24-inch vertical leap regardless of how small you became. So given those facts, you could simplyjumpout of the blender.

Another interesting thing to note: you'd actually have what seems to be 70 minutes to come up with the solution, because time would travel 70 times slower for you at that size. The speed of light and the speed of electrons is constant, but when you're tiny, photons and electrons have less distance to travel.

External Articulation of Concepts Materializes Innate Knowledge of One's Craft and Science

**Beginner in Game Development? **Read here. And read here.

Super Mario Bros clone tutorial written in XNA 4.0 [MonoGame, ANX, and MonoXNA] by Scott Haley

If you have found any of the posts helpful, please show your appreciation by clicking the up arrow on those posts

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Posted 31 March 2011 - 01:40 PM

I thought since the light has less distance to travel, things would seem faster.....

You will go faster and the rest of the environment will appear to be slower as, in theory, you should perceive your increased speed to be the same as your speed now.

Posted 21 April 2011 - 08:03 AM

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This topic help me a lot in developing my project. I will contribute more when I finished it.

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Posted 21 April 2011 - 12:46 PM

Oooo. I like that. I didn't realize it before.Binary search has worst-case O(logn).

Finding split point is O(n), so finding the point of rotation is several times more expensive than search itself.

Since array is sorted, recursive split can be used to determine which half is out of order. Predicates for binary search are: left < mid < right (equalities optional)

Posted 19 May 2011 - 09:48 AM

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Best regards.