3,251 reputation
1030
bio website google.com
location New York, NY
age 94
visits member for 2 years, 7 months
seen yesterday

I like fish! And agonizing over solving the Finite Sub-Cuddling hypothesis!

The chameleon, incidentally, says "Maaaaaaaaaaaaaaaaattthh!"


Jul
25
revised How to show $\psi^*(x,-t)$ is also solution of the Schrodinger equation
edited title
Jul
25
revised Solve the given differential equation by using Green's function method
edited title
Jul
24
comment Binomial dependent on a Poisson
If you'd like to learn a lot of the tricks that, if you don't know them, seem like magic, grab this book from your library. (When I was in grad school, I wish I had earlier)
Jul
24
comment The Goblin Game
I am fairly sure this game doesn't have a solution that helps you. It reminds me of an experiment by Selten I participated in: a repeated game in which in each round each participant writes down a number from 1-20, and whoever is closest to half the numbers' average wins that round. The averages. maybe not surprisingly, slowly approached zero; and in the last round one sociology student proudly told me he figured out that using 20 would maximize his chances! (Having observed winning numbers of about 7, 5, 3 before). Even assuming you'd find a NE, your friends are unlikely to play by it.
Jul
11
comment Could it be that Goldbach conjecture is undecidable?
Per this meta discussion, I think a summary of some of what was said on MO in more accessible terms might make a good MSE answer, if anyone feels like writing it.
Jul
11
comment What is the sufficient condition for the value of integrable function $f\in L^1(\mathbb{R})$ to go to $0$ when $|x|\rightarrow \infty$?
I think you mean $\mathbb{Q}$. And isn't that a counter to necessary, and you are looking for sufficient?
Jul
11
revised rate of growth of function with specified zeros
added 15 characters in body
Jul
11
comment What is the sufficient condition for the value of integrable function $f\in L^1(\mathbb{R})$ to go to $0$ when $|x|\rightarrow \infty$?
They would be points of discontinuity though on a null set, with the points in the complement of that null set well behaved. And my understanding of your question is that the function is integrable, so the case you describe should not be possible. However, a strict proof should be necessary, I agree.
Jul
11
comment What is the sufficient condition for the value of integrable function $f\in L^1(\mathbb{R})$ to go to $0$ when $|x|\rightarrow \infty$?
It's "differentiable" in English, and I think you're right. As to a.s., this should't matter as the integral over a null set won't matter.
Jul
10
comment Underdetermined system of equations
You fix two variables (mention they are between 0 and 1), and write the other 3 variables as a function of these two. So you get a solution of type $x_i = f(x_1, x_2)$ for $i= 3,4,5$, say.
Jul
9
reviewed No Action Needed asymptotic approximation for number of partitions of integer that do contain 1 nor 2
Jul
9
reviewed Leave Open Drawing previously undrawn cards from a deck
Jul
9
reviewed Close Test for convergence $\sum_{n = 2}^\infty \frac{1}{(n+1)\ln^2(n+1)}$
Jul
9
reviewed Close Fixed point equivalence
Jul
9
reviewed Leave Open Elementary limits, from left and right.
Jul
9
reviewed Approve suggested edit on Count the whistles
Jul
8
comment Dividing by x on two sides of an equation is not always the same equation??
It's as you say: if the second is true (which must mean x is not 0), the first is true (this is called "B implies A"); and if the first is true, x could be zero, so A does not imply B (only for x not zero it does). Two equations are "equal" is called they are "equivalent", which is the same as saying either one implies the other. As this is not true here, they are not equivalent.
Jul
8
comment Continuous function - unsure of statement that lacks rigour
@AsafKaraglia: lesson learned - don't participate before finishing your first coffee.
Jul
8
comment Continuous function - unsure of statement that lacks rigour
@MichaelAlbanese: how is $| f^{-1}(b)| = 1$ in your example?
Jul
8
reviewed Leave Open Find the point of intersection of plan and parabaloid