marty cohen

less info
meta site favicon meta user | stack exchange network profile network profile
6,869 reputation
1619
bio website
location
age
visits member for 1 year, 10 months
seen 12 hours ago
stats profile views 606

Martin Cohen is a retired computer programmer who loves dancing (favorites are West Coast Swing, Waltz, Tango, and Foxtrot), writing (but not revising) poems, and solving math problems.

He can also be reached at mjcohen@acm.org.


422 Answers

newest activity votes
23
Why doesn't integrating the area of the square give the volume of the cube?
13
Proof that $\lim_{n\rightarrow \infty} \sqrt[n]{n}=1$
11
Theorems with an extraordinary exception or a small number of sporadic exceptions
10
A Question about Doctoral Theses in Mathematics
10
If you have a $1$ in $36$ chance of winning an event. What is the probability that you will win at least once in $36$ tries?
9
Without calculating limit directly show that it is equal to zero
9
The last few digits of $0^0$ are $\ldots0000000001$ (according to WolframAlpha).
9
Find the maximum of $f(x)=x^{1/x}$
8
What could be better than base 10?
8
Problem over prime numbers
8
How can I verify the Pythagorean Trig Identity using approximations for $\sin x$ and $\cos x$ derived from their infinite series representations?
6
Why don't we define “imaginary” numbers for every “impossibility”?
6
pronunciation of sinh x, cosh x, tanh x for short
6
Are half of all numbers odd?
5
$\sum\limits_{\text{prime }p} 2^{-p}$ is an irrational number
5
Values for which tetration to infinite heights (i.e., $x^{x^{x^{x^{.^{.^{.}}}}}}$) converges
5
a elementary number theory problem
5
Finding the sum of a series $\sum_{n=4}^{\infty}\frac{1}{n^{2}-1}$
5
Approximation of first derivative?
4
Generating function: Find a closed form of $\sum_{k=0}^n (-3)^k(k+1)$
4
power of a number in a factorial
4
Proving by induction $P_n \le 5 - \frac5n$
4
What will be total number of solutions of $n_1a+n_2b+n_3c=n$?
4
A limit involves series and factorials
4
Should the notation $\int_{0}^{x} f(x) dx$ be frowned upon?
4
What is a good list of more than 20 math books for functional equation with 200+ pages of each
4
Check if a point is within an ellipse
4
How to prove that $\sqrt 3$ is an irrational number?
3
Solving the equation $\dfrac{(1+x)^{36} -1}{x} =20142.9/420$ for $x$.
3
How to integrate $\int \sqrt{x^2+a^2}dx$
1 2 3 4 5 … 15