## Search found 377 matches

- Mon Mar 03, 2014 9:59 pm UTC
- Forum: Gaming
- Topic: Games you can't remember the title of.
- Replies:
**1941** - Views:
**559640**

### Re: Games you can't remember the title of.

Can any turn-based strategy people help me out with this one? Overview: A bare-bones space-themed 4X game. Genre: Turn-based Strategy, Space, 4X (eXplore the initially unknown galaxy, eXpand to every star you can, eXpliot those stars to produce units, eXterminate all other players). Gameplay: Turn-b...

- Wed Jun 08, 2011 6:20 pm UTC
- Forum: Forum Games
- Topic: Create a Card: MTG
- Replies:
**3761** - Views:
**406586**

### Re: Create a Card: MTG

Legend of the Seven Flames 2R Enchantment If an opponent has been dealt 7 damage this turn while Legend of the Seven Flames was on the battlefield, sacrifice Legend of the Seven Flames. If you do, put seven 2/1 red Elemental creature tokens with haste onto the battlefield. Next Card: Glean --or-- SP...

- Wed Jun 08, 2011 5:56 pm UTC
- Forum: Mathematics
- Topic: multiple solutions in schaum's outline
- Replies:
**3** - Views:
**1071**

### Re: multiple solutions in schaum's outline

They are solutions in different cases, depending on the sign of the expression under the radical. One is for r^2 > p^2 + q^2, the other for r^2 < p^2 + q^2.

- Fri May 13, 2011 12:50 pm UTC
- Forum: Mathematics
- Topic: Is f(-x) convex?
- Replies:
**7** - Views:
**1802**

### Re: Is f(-x) convex?

The intuitive proof, but with a bit more rigor: f is convex, so the (unbounded) region F "above" the graph of f is a convex set. Reflecting across the y axis gives a region G, which is clearly the region "above" the graph of g. But reflection doesn't change the convexity of a set...

- Fri May 13, 2011 1:09 am UTC
- Forum: Mathematics
- Topic: Partial derivatives and the chain rule question
- Replies:
**3** - Views:
**1200**

### Re: Partial derivatives and the chain rule question

Is V is a function of F and t, while F itself is a function of S and t? In other words, does a diagram of variable dependence look something like this: ..V.. ./.\. /...\ F...| |\..| |.\.| |..\| S...t If that's true, yes, you will get that dV/dt = (dV/dF)*(dF/dt) + dV/dt because to find the multi-var...

- Thu May 05, 2011 12:28 am UTC
- Forum: Forum Games
- Topic: Create a Card: MTG
- Replies:
**3761** - Views:
**406586**

### Re: Create a Card: MTG

Redstone Torch 2 Artifact ~ enters the battlefield with a charge counter on it. T, remove a charge counter from ~: Each other artifact you control gains a charge counter if it has none, but loses all charge counters if it had any. 3, remove a charge counter from another artifact you control: ~ gains...

- Thu Apr 28, 2011 2:09 am UTC
- Forum: Mathematics
- Topic: Oh my lanta....
- Replies:
**9** - Views:
**2235**

### Re: Oh my lanta....

It's ambiguous. Never write "6÷2(1+2)" if you want your work to be understood without further explanation. When one sees "2(1+2)" in an expression, one can reasonably assume that it should be evaluated as a group. And yet this contradicts the usual left-to-right order of operatio...

- Tue Apr 26, 2011 3:08 pm UTC
- Forum: Forum Games
- Topic: Create a Card: MTG
- Replies:
**3761** - Views:
**406586**

### Re: Create a Card: MTG

Cecil, Red Wings Captain 3BB Legendary Creature - Human Lunarian Knight BBB: Cecil deals 2 damage to himself and to each nonblack creature your opponents control. One to be born From a dragon Hosting the light And the dark -Mysidian Legend 2/6 Next Card: Cecil, King of Baron -OR- Mysidian Legend -OR...

- Wed Apr 20, 2011 12:10 am UTC
- Forum: Mathematics
- Topic: Little probability problem (additional tries for successes)
- Replies:
**10** - Views:
**1558**

### Re: Little probability problem (additional tries for success

Here's another way to approach it: You are hoping to get 12 successes, in which case you are going to get 11 "extra" attempts, for a total of 31 attempts. So, what is the probability that you get at least 12 successes in 31 attempts, but this time you don't get extra attempts for each succ...

- Tue Apr 19, 2011 3:52 pm UTC
- Forum: Mathematics
- Topic: Hyperbola problem help.
- Replies:
**8** - Views:
**1142**

### Re: Hyperbola problem help.

To get the equation you are looking for, take an arbitrary point (x,y) and then translate the phrase "distance from the origin is twice their distance from the line" into symbols. You should get something that can be put into the form Ax^2+Bxy+Cy^2+Dx+Ey+F=0 , which means that it is a coni...

- Thu Mar 17, 2011 10:38 pm UTC
- Forum: Forum Games
- Topic: Create a Card: MTG
- Replies:
**3761** - Views:
**406586**

### Re: Create a Card: MTG

Clockwork Goblin 1 Artifact Creature - Goblin 0/0 Clockwork Goblin enters the battlefield with two +1/+1 counters on it. Whenever Clockwork Goblin attacks or blocks, remove a +1/+1 counter from it at end of combat. Clockwork Goblin attacks each turn if able. T: Put a +1/+1 counter on Clockwork Gobli...

- Sun Mar 06, 2011 3:46 pm UTC
- Forum: Mathematics
- Topic: Partial Derivatives and Chain Rule and PDEs! Oh my!
- Replies:
**3** - Views:
**1143**

### Re: Partial Derivatives and Chain Rule and PDEs! Oh my!

I didn't follow through all of your work, but I see a potential problem in the initial substitution: u = x + ay v = x + by If this substitution is supposed to represent a generalized change to some u and v that are independent linear combinations of x and y, then it fails, because it does not allow ...

- Wed Mar 02, 2011 3:16 pm UTC
- Forum: Mathematics
- Topic: Probability Paradox
- Replies:
**10** - Views:
**2064**

### Re: Probability Paradox

Perhaps part of the problem with accepting a uniform random variable X on [0,1] (for example) is that this interval contains numbers that we could never describe since it is an uncountable set, and every way we have ever come up with for describing mathematical objects is countable in nature (We use...

- Mon Feb 28, 2011 6:49 pm UTC
- Forum: Forum Games
- Topic: Create a Card: MTG
- Replies:
**3761** - Views:
**406586**

### Re: Create a Card: MTG

Lime Green Paint

0

Artifact - Equipment

Equip 0

Equipped creature is Green.

Next Card: Armed // Dangerous (Split card)

0

Artifact - Equipment

Equip 0

Equipped creature is Green.

Next Card: Armed // Dangerous (Split card)

- Tue Feb 15, 2011 12:26 am UTC
- Forum: Mathematics
- Topic: "nontrivial subgroups" (terminology question)
- Replies:
**7** - Views:
**2256**

### Re: "nontrivial subgroups" (terminology question)

Definitely (a)

The trivial subgroup of any group G is the subgroup with just one element. So a nontrivial subgroup is any other subgroup. If G itself is not supposed to be considered, you should specify "proper", as others have indicated.

The trivial subgroup of any group G is the subgroup with just one element. So a nontrivial subgroup is any other subgroup. If G itself is not supposed to be considered, you should specify "proper", as others have indicated.

- Sun Feb 13, 2011 5:04 pm UTC
- Forum: Logic Puzzles
- Topic: Cut this in half.
- Replies:
**10** - Views:
**2814**

### Re: Cut this in half.

Yakk wrote:And with 5 more cuts, I could make 2 10x10 squares.

I think you need at least 3 dimensions to do that.

- Fri Feb 11, 2011 2:06 pm UTC
- Forum: Forum Games
- Topic: Create a Card: MTG
- Replies:
**3761** - Views:
**406586**

### Re: Create a Card: MTG

Ambitious Sliver

1UB

Creature - Sliver

All Slivers have "When this permanent enters the battlefield, you draw a card and lose 1 life."

2/2

Next card: Brass Goblin

1UB

Creature - Sliver

All Slivers have "When this permanent enters the battlefield, you draw a card and lose 1 life."

2/2

Next card: Brass Goblin

- Fri Feb 11, 2011 1:02 am UTC
- Forum: Mathematics
- Topic: Pebbles in buckets, a modified random walk
- Replies:
**26** - Views:
**2451**

### Re: Pebbles in buckets, a modified random walk

At each step of an m-dimensional random walk along lattice lines, there are 2m choices of directions. So the 6 bucket case corresponds to the 3-dimensional random lattice walk. It is a known result that for 1- or 2-dimensional random lattice walks, you will get back to the origin (in terms of bucket...

- Wed Dec 15, 2010 5:06 pm UTC
- Forum: Mathematics
- Topic: Flag colouring
- Replies:
**10** - Views:
**1336**

### Re: Flag colouring

Darryl wrote:Your problem here was what you took for the "all possibilities". You have four regions, and 6 choices for each reason. Which is not 6^4.

Ummm....

- Mon Dec 13, 2010 10:46 pm UTC
- Forum: Forum Games
- Topic: The Book Challenge
- Replies:
**261** - Views:
**22310**

### Re: The Book Challenge

(e) Combine (c) and (d) to get that

[math]h(x+iy)=\int_a^b \frac{x}{x^2+(y-t)^2}\,dt=arctan\left(\frac{y-a}{x}\right)-arctan\left(\frac{y-b}{x}\right)[/math]

[math]h(x+iy)=\int_a^b \frac{x}{x^2+(y-t)^2}\,dt=arctan\left(\frac{y-a}{x}\right)-arctan\left(\frac{y-b}{x}\right)[/math]

- Tue Dec 07, 2010 5:52 pm UTC
- Forum: Mathematics
- Topic: FTC part 1
- Replies:
**3** - Views:
**943**

### Re: FTC part 1

Yes! it does say that. Makes intuitive sense, too, doesn't it?

- Thu Dec 02, 2010 5:06 pm UTC
- Forum: Forum Games
- Topic: Create a Card: MTG
- Replies:
**3761** - Views:
**406586**

### Re: Create a Card: MTG

Indomitable Snowflake

WW

Snow Creature - Elemental

0/1

Indomitable Snowflake cannot be controlled except by its owner.

If Indomitable Snowflake would be destroyed, regenerate it.

Next Card - Euphemism

WW

Snow Creature - Elemental

0/1

Indomitable Snowflake cannot be controlled except by its owner.

If Indomitable Snowflake would be destroyed, regenerate it.

Next Card - Euphemism

- Thu Nov 18, 2010 12:03 am UTC
- Forum: Mathematics
- Topic: Quick question about the integration of -1/x
- Replies:
**4** - Views:
**808**

### Re: Quick question about the integration of -1/x

The correct antiderivative of 1/x is ln|x|. That should solve all your issues.

- Wed Nov 17, 2010 3:39 pm UTC
- Forum: Gaming
- Topic: Plants Vs. Zombies
- Replies:
**51** - Views:
**9686**

### Re: Plants Vs. Zombies

Making Money: Use lots of Marigolds on the mini-game "The Last Stand". The cheapest defense you can put up will involve 2 Gloom-shrooms protected by 2 garlic on the 2nd row. Same thing on the 5th row. Place Magnet-shrooms to deal with the armored zombies, and pumpkins where necessary to pr...

- Sun Nov 14, 2010 7:13 pm UTC
- Forum: Logic Puzzles
- Topic: 20 prisoners
- Replies:
**29** - Views:
**8459**

### Re: 20 prisoners

Thought I should make a new reply rather than repeatedly edit the above reply. The solution under the spoiler above does not follow the restriction given in this puzzle of "the prisoner must switch exactly one switch" each time he is forced to enter the room. However, the prisoners can sim...

- Sun Nov 14, 2010 6:37 pm UTC
- Forum: Logic Puzzles
- Topic: 20 prisoners
- Replies:
**29** - Views:
**8459**

### Re: 20 prisoners

The hard version of this problem was already done (using only a single switch, even) on these forums. http://forums.xkcd.com/viewtopic.php?t=73 The solution they found: One prisoner (call him Bob) repeatedly requests to be let into the room. Bob's job is to turn the switch OFF every time...

- Tue Oct 19, 2010 1:55 pm UTC
- Forum: Mathematics
- Topic: Is there a field of every infinite cardinality?
- Replies:
**6** - Views:
**2105**

### Re: Is there a field of every infinite cardinality?

For any infinite cardinal B, the finite polynomials using B indeterminates and with integer coefficients form a ring of cardinality B. Note that it is commutative and has no zero divisors, so it is also an integral domain. Once you've got an infinite integral domain, its field of fractions is a fiel...

- Wed Oct 13, 2010 1:31 pm UTC
- Forum: Mathematics
- Topic: The limit of sin(1/x) as x approaches 0 does not exist?
- Replies:
**4** - Views:
**5562**

### Re: The limit of sin(1/x) as x approaches 0 does not exist?

What really gets me, though, is the intuition about this. Doing limits by intuition is probably fine for a first calculus course (In fact, some courses skip over more rigorous definitions in favor of intuitive ones), but for more technical questions like sin(1/x) as x goes to 0 require a more exact...

- Mon Oct 04, 2010 10:33 pm UTC
- Forum: Mathematics
- Topic: How does one solve this?
- Replies:
**5** - Views:
**1196**

### Re: How does one solve this?

Theorem: The limit of a product of two terms is the product of the limits of those two terms (assuming that those two limits exist)

- Sun Sep 19, 2010 6:03 pm UTC
- Forum: Mathematics
- Topic: Topology Extra Credit Problem
- Replies:
**12** - Views:
**1570**

### Re: Topology Extra Credit Problem

I don't see how to use your professor's hint (Seems to me like it would only help you find countable subsets, but maybe I just don't see the "trick"), but I can think of a simple variant on the Cantor Set that works.

- Wed Jul 28, 2010 2:43 am UTC
- Forum: Logic Puzzles
- Topic: Chess problem: The missing king
- Replies:
**60** - Views:
**11465**

### Re: Chess problem: The missing king

Got this one as: 1.h4 d5 2.h5 Nd7 3.h6 Ndf6 4.hxg7 Kd7 5.Rh6 Ne8 6.gxf8=N++ White has only one move to spare for a piece to help out with covering the black king's escape squares. Tried using the d,e, or g pawns along with the queen, queen, or bishop (respectively) as the support piece, ...

- Thu Jul 08, 2010 10:08 pm UTC
- Forum: Logic Puzzles
- Topic: Hunters and prey (Newcomb's paradox?)
- Replies:
**11** - Views:
**2898**

### Re: Hunters and prey (Newcomb's paradox?)

⋅ No matter what I do, the hunters will always catch 80% of us ⋅ Therefore, 80% of us will follow a "wrong" strategy. ⋅ Therefore, my strategy will be: do the opposite of what the majority of the others do. ⋅ But wait, the others are also following...

- Wed Jun 23, 2010 2:42 pm UTC
- Forum: Individual XKCD Comic Threads
- Topic: 0757: "Toot"
- Replies:
**103** - Views:
**22989**

### Re: "Toot" discussion (#757)

So Blacker must be like Slytherin? They're all fine houses Except for Booty House. I hear they're all a bunch of chain-smoking kleptomaniacs. In my opinion Blacker Hovse as Slytherin, though? The name may suggest it, but when I was a frosh, I got the impression that they were rather unambitious on ...

- Sun May 30, 2010 11:03 am UTC
- Forum: Mathematics
- Topic: Seemingly ridiculous rules/conventions
- Replies:
**59** - Views:
**7885**

### Re: Seemingly ridiculous rules/conventions

Syrin wrote:I figure I'm entitled to some modicum of pedantry on a mathematics forum.

I would have been the pedant if you hadn't beat me to it.

- Sat May 29, 2010 8:49 pm UTC
- Forum: Logic Puzzles
- Topic: Slash 'n' Dash Sequence
- Replies:
**4** - Views:
**1827**

### Re: Slash 'n' Dash Sequence

Looks like /-\---- /-\//-\\ /-\----- comes next. (Pretty good puzzle, I hope others give it a go.) Edit: The top string in the sequence "-" isn't incorrect, but it would be better if it were the empty string "". Of course, in the forums, this would be hard to distinguish from a m...

- Mon May 24, 2010 9:02 pm UTC
- Forum: Mathematics
- Topic: Abusive Usage of Language
- Replies:
**2** - Views:
**818**

### Re: Abusive Usage of Language

Well, that's not so surprising. The extended reals also have an absorbing element ( +\infty ), but it still makes sense to call the operation "addition". And objects with nonzero mass that travel at the speed of light (hypothetically) have infinite momentum and energy (which must be conser...

- Sun May 23, 2010 4:11 pm UTC
- Forum: Gaming
- Topic: Games you can't remember the title of.
- Replies:
**1941** - Views:
**559640**

### Re: Games you can't remember the title of.

I'm trying to find a certain Puzzle Platformer game where your character could create blocks (more on that below). I played it about 4-5 years ago on my PC, but I can't say how new it was at the time. It was very colorful and slightly cartoony. The perspective was your typical 2D third-person side-v...

- Fri Apr 30, 2010 12:22 am UTC
- Forum: Mathematics
- Topic: Interesting Combinations Problem
- Replies:
**9** - Views:
**1665**

### Re: Interesting Combinations Problem

Letting "S" represent Stirling numbers of the second kind... There are S(15,7) ways to partition the set of 15 balls into 7 non-empty subsets, multiplied by the falling factorial (10) 7 ways to put those 7 subsets into the 10 boxes. So the answer is 247,206,758,198,400 as reported by Qaanol.

- Tue Apr 20, 2010 11:57 pm UTC
- Forum: Mathematics
- Topic: Interesting infinite series for phi
- Replies:
**2** - Views:
**1195**

### Re: Interesting infinite series for phi

\frac{(-1)^{n+1}(2n+1)!}{4^{n+1}n!} in the RHS summand is the same as \frac{1}{2}\cdot\frac{-1}{2}\cdot\frac{-3}{2}\cdots\frac{-(2n+1)}{2} , i.e. the falling factorial (\frac{1}{2})_{n+2} . So the summand can be written as \frac{(\frac{1}{2})_{n+2}}{(n+2&...

- Tue Apr 13, 2010 10:38 pm UTC
- Forum: Logic Puzzles
- Topic: Given that you have a brother...
- Replies:
**41** - Views:
**7748**

### Re: Given that you have a brother...

Hmm... Just thought of a way it could be a greater than 50% chance that you are male. Suppose no family ever stops at exactly 1 male child, but that some families are satisfied and stop when they have only females. Then the collection of people with brothers would include every male (males with brot...