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across:
Group Title
FoolForMath and asnaseer,
I decided to give Project Euler 27 a try in C++ and ended up with this:…
 updated 2 years ago
 23 replies
 7 Medals
Mathematics

across:
Group Title
Trivia: What axiom distinguishes the real numbers \(\mathbb{R}\) from the rational numbers \(\mathbb{Q}\) and what does it state?\[\]
 updated 2 years ago
 18 replies
 8 Medals
Mathematics

across:
Group Title
Whilst seeking to recall a few things about metric spaces, I ran into the embarrassing problem of not being able to grasp the notion behind …
 updated 2 years ago
 3 replies
 1 Medal
Mathematics

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someone1348, let \(f\) be defined on an interval \(I\) and suppose that there exists \(M>0\) and \(\alpha>0\) such that\[f(y)f(x)\leq Mx…
 updated 2 years ago
 2 replies
 2 Medals
Mathematics

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I once met a respectable professor who believed that there is no such thing as an irrational number. Unfortunately, he never stated his reas…
 updated 2 years ago
 17 replies
 7 Medals
Mathematics

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I was looking through my old tests and found a short but interesting problem. You guys give it a quick try!
…
 updated 2 years ago
 70 replies
 10 Medals
Mathematics

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einmal mehr haben wir zwei neue planeten gefunden: http://web.mit.edu/newsoffice/2011/twonewplanetsfound1221.html die kommen doch sehr n…
 updated 2 years ago
 4 replies
 2 Medals
Mathematics

across:
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Mr. Math, could you help me graph \[(x^2+y^21)^3x^2y^3=0?\]
 updated 2 years ago
 9 replies
 4 Medals
Mathematics

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Express \(i\) in terms of \(u\):\[2i + 4 > 2(3u  2).\]
 updated 2 years ago
 13 replies
 7 Medals
Mathematics

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How do I solve x + 3 = 5?
Now that that's out of the way, I quickly wanted to wish you guys a merry Christmas, a happy new year and a prosp…
 updated 2 years ago
 11 replies
 9 Medals
Mathematics

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I'm a diehard Latex fan would like to share a cool website with you to format your questions/answers without having to type them here (the …
 updated 2 years ago
 6 replies
 5 Medals
Mathematics

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Let's have some fun:
Express\[\sum_{n=2}^{\infty}n(n1)c_nx^{n2}+\sum_{n=0}^{\infty}c_nx^{n+1}\]as a single power series.
 updated 2 years ago
 6 replies
 No Medals Yet
Mathematics

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What's the area of the surface described by the function\[z=f(x,y)=x^2y^2xy\]in the region\[R=[1,1]\times[1,1]?\]Go, go, go! :)
 updated 2 years ago
 26 replies
 2 Medals
Mathematics

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How do you tackle nonlinear, nonseparable, nonhomogeneous ODEs? I.e.\[\frac{dy}{dx}=\sin(x+y)\]
 updated 2 years ago
 2 replies
 No Medals Yet
Mathematics

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I wonder what I did wrong... http://i40.tinypic.com/25g8gfk.png
 updated 2 years ago
 5 replies
 3 Medals
Mathematics

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\[\frac{\partial u}{\partial t}=k\frac{\partial^2 u}{\partial x^2}\]\[u(x,0)=f(x),\]\[u(0,t)=0,\]\[u(L,t)=0.\]Let's have some fun.
 updated 2 years ago
 25 replies
 3 Medals
Mathematics

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What is the smallest positive number that is evenly divisible by all of the numbers from 1 to 20?
 updated 2 years ago
 25 replies
 5 Medals
Mathematics

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Do all mathematicians have at least some mild case of OCD? I will admit to frequently being a noticeable perfectionist, specially when it c…
 updated 2 years ago
 7 replies
 2 Medals
Mathematics

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Handle with care:\[\frac{\partial u}{\partial t}+c\frac{\partial u}{\partial x}+au=0.\]Let us solve for u(t,x)!
 updated 2 years ago
 31 replies
 3 Medals
Mathematics

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Ich werde dir einen Stern geben, wenn du das verstehen kannst und wenn du die folgende Gleichung löst:\[y''10y'+25y=0.\]Macht's Spaß!
 updated 2 years ago
 19 replies
 2 Medals
Mathematics

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How would you describe the transition from studying ODEs to studying PDEs to an undergraduate student?
Now for the real question, is anyo…
 updated 2 years ago
 3 replies
 2 Medals
Mathematics

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Is this BS? http://www.bigblare.com/1966mysteryofzeroresolved/
 updated 2 years ago
 11 replies
 1 Medal
Mathematics

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A student asked me something, and I'd like to post it here for kicks.\[\frac{1}{2}\frac{2}{(s3)^24}=\frac{1}{s^26s+5}=\frac{1}{(s5)(s1…
 updated 2 years ago
 4 replies
 1 Medal
Mathematics

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Let's have some (Monday) fun!
I will give free medals for those who at least try to solve the following, notsobad differential equation:…
 updated 2 years ago
 3 replies
 3 Medals
Mathematics

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Is it just me, or is mathematics never selffulfilling?
Don't get me wrong: I treasure it with my whole soul, I can't resist a good puzzle…
 updated 2 years ago
 13 replies
 7 Medals
Mathematics

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Fun DE time!
Given\[f(x)=\begin{cases}…
 updated 3 years ago
 7 replies
 2 Medals
Mathematics

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Round four (>:P)
 updated 3 years ago
 3 replies
 1 Medal
Mathematics

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Round three (_):
 updated 3 years ago
 8 replies
 1 Medal
Mathematics

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Round two:
 updated 3 years ago
 4 replies
 3 Medals
Mathematics

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The question is too long. Thus,
 updated 3 years ago
 8 replies
 3 Medals
Mathematics
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