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• February 15th, 2020, 09:43
Hi btekcan, Unfortunately MarkFL has been missing for a while. I don't think he'll see this question. I still am very hopeful that we'll see him...
15 replies | 3311 view(s)
• February 14th, 2020, 21:05
masters replied to a thread Scale Factor in Geometry
So, the question asked about "scale factor", not ratio of any kind. Is the answer, in fact, "D", which is 3/2?
5 replies | 115 view(s)
• February 14th, 2020, 19:11
masters replied to a thread Scale Factor in Geometry
Then, is this textbook example incorrect?
5 replies | 115 view(s)
• February 14th, 2020, 18:17
masters started a thread Scale Factor in Geometry
Triangles ABC and DEF are similar. Triangle ABC has a perimeter of 16cm. Triangle DEF has side of 6cm, 8cm and 10cm. What is the scale...
5 replies | 115 view(s)
• February 13th, 2020, 18:47
Hi again everyone, Latest update is I just met with a software developer who will handle some of the smaller migration details so we can make the...
8 replies | 1182 view(s)
• February 12th, 2020, 23:33
Here is this week's POTW: ----- Let $ABCD$ be a cyclic quadrilateral. The side lengths of $ABCD$ are distinct integers less than 15 such that...
0 replies | 150 view(s)
• February 12th, 2020, 23:19
Congratulations to the following members for their correct answer! 1. castor28 2. MegaMoh Solution from castor28: Let $q$ be the ratio of the...
2 replies | 423 view(s)
• February 9th, 2020, 20:33
I thought I'd make a new thread for some snippets of more "advanced" LaTeX codes that are not covered by the basic LaTeX tutorial. For example:...
0 replies | 85 view(s)
• February 4th, 2020, 10:17
Hi MHB, I was told by castor28 that this week's POTW (High School) was a duplicate of POTW #363, which is true. I am truly sorry for letting this...
2 replies | 423 view(s)
• February 3rd, 2020, 01:04
I realize now that the statement I want to prove does not hold for the random walk on a big complete graph.
2 replies | 211 view(s)
• February 2nd, 2020, 10:11
Here is this week's POTW: ----- Monic quadratic polynomials $P(x)$ and $Q(x)$ have the property that $P(Q(x))$ has zeros at $x=-23,\,-21,\,-17$...
2 replies | 423 view(s)
• February 2nd, 2020, 10:03
Solution from other: Summing just the $k=0$ and $k=1$ terms from the identity \ln 2=\sum_{k=0}^\infty...
2 replies | 457 view(s)
• February 2nd, 2020, 09:22
No one answered POTW #402.(Sadface) You can find the suggested solution by other below. Let ...
1 replies | 542 view(s)
• February 1st, 2020, 00:36
Let $X=X_0, X_1, X_2, \ldots$ be a Markov chain on a finite state space $S$, and let $P$ denote the transition matrix. Assume that there is an...
2 replies | 211 view(s)
• February 1st, 2020, 00:34
In $G(n, p)$, the edges appear independently with probability $p$ (by definition of $G(n, p)$). So the question indeed is asking to prove something...
1 replies | 214 view(s)
• January 20th, 2020, 11:42
Here is this week's POTW: ----- The set of real numbers $x$ for which $\dfrac{1}{x-2009}+\dfrac{1}{x-2010}+\dfrac{1}{x-2011}\ge 1$ is...
1 replies | 542 view(s)
• January 20th, 2020, 11:30
Congratulations to Opalg for his partial correct solution!(Cool) You can find the suggested solution as shown below: Because 1, 3, 5 and 7 are...
1 replies | 359 view(s)
• January 20th, 2020, 08:00
Sorry, I mispoke here. \Lambda = Mc where M is much larger than the other masses in the theory. -Dan
1 replies | 130 view(s)
• January 19th, 2020, 18:31
The equations here come from calculating the amplitude of a Feynman diagram. I can set up the problem if you really want me to but here I am just...
1 replies | 130 view(s)
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