38,246 reputation
13671
bio website zakuski.utsa.edu/~jagy
location Berkeley, CA
age 57
visits member for 3 years, 2 months
seen 4 hours ago

I put an email address here and intended it to be visible. In case it is not, search with my last name at http://www.ams.org/cml/

See me at http://mathoverflow.net/users/3324/will-jagy

and http://zakuski.utsa.edu/~jagy/ and

http://zakuski.math.utsa.edu/~kap/forms.html and

http://arxiv.org/find/math/1/au:+Jagy_W/0/1/0/all/0/1

If people would include the source of a given problem as part of the process of posting a question, life would be a little easier.


1d
comment how to find taxicab numbers but for squares?
factor them and keep track of what the prime factors are $\bmod 4$
1d
comment How to judge if a symmetric matrix can be factorized into two vectors?
also, this is not what is called symmetric, although it does have a symmetry.
1d
comment Asymptotic Behaviour Of A Bizarre Function
Your $$ \color{magenta}{f(n) = n - s_2(n)}, $$ where $$ \color{magenta}{ s_2(n)} $$ is the number of $1$'s used when writing $n$ in binary (base two).
1d
comment Asymptotic Behaviour Of A Bizarre Function
$$ \color{magenta}{f(n) = n - s_2(n)}, $$ where $$ \color{magenta}{ s_2(n)} $$ is the sum of the digits when writing $n$ in binary (base two).
1d
revised Asymptotic Behaviour Of A Bizarre Function
added 342 characters in body
1d
revised Asymptotic Behaviour Of A Bizarre Function
added 3886 characters in body
1d
comment How to find the height of a tower given the distance, angle of elevation, and angle of depression?
@gnometorule, the Urban dictionary uses both spellings. Good to know.
1d
comment How to find the height of a tower given the distance, angle of elevation, and angle of depression?
@gnometorule, I think that would be howork, otherwise we could be discussing gardening.
1d
comment How to find the height of a tower given the distance, angle of elevation, and angle of depression?
Another Saturday night and I ain't got nobody, I got some money cause I just got paid, Oh how I wish I had someone to talk to, I'm in an awful way. youtube.com/watch?v=-sxf-P3JBio
1d
revised Asymptotic Behaviour Of A Bizarre Function
added 1790 characters in body
1d
answered Asymptotic Behaviour Of A Bizarre Function
1d
comment Division with Remainder
perhaps your calculator did 12/48 instead of 48/12
1d
comment Asymptotic Behaviour Of A Bizarre Function
You really ought to be doing computer experiments on this yourself. You might get a conjecture that can be described explicitly, in any case you will learn things you do not currently know. Do integer $x$ up to 100, say.
1d
comment Asymptotic Behaviour Of A Bizarre Function
Nothing changes if I take an integer $n$ and a disturbance $0 \leq \delta < 1,$ I still get $$ \lfloor (n+\delta) / 2^k \rfloor = \lfloor n / 2^k \rfloor $$ same for any denominator
1d
comment Asymptotic Behaviour Of A Bizarre Function
If $x$ is an integer, this is the exponent of $2$ in the prime factorization of $x!$ If $x$ is not an integer, it is still the exponent of $2$ in $\lfloor x \rfloor ! $
2d
comment What's the probability that a device with 0.2 per million run time failure rate fails twice in a time period?
@XLL, I am guessing that you do not see any choice on the screen by which you might delete it yourself. So, I will flag for moderator attention, pointing out that you have requested deletion.
2d
comment What's the probability that a device with 0.2 per million run time failure rate fails twice in a time period?
@Xiaoliang, I suggest you just drop it. Last time this happened, it was some guy wanting support for his unpleasant ideas about rape. As I recall, he did edit the thing, but too late.
2d
comment What's the probability that a device with 0.2 per million run time failure rate fails twice in a time period?
MPW, there have been occasional agenda based questions, distasteful certainly. I have tended to think that the point was, such people have not the slightest clue what mathematicians do. Just remember how far this person is from understanding you.
2d
comment Confusing pictures, Understand how each graph looks but not which matches with such bad pictures. Any Help?
The fault, dear Brutus, lies not in your pictures, but in yourself.
2d
comment Limit of Sum $\sum \frac{p(k+1) - p(k)}{p(k)^2}$ ? (corrected)
It probably falls short. With primes up to 10,000,000, it is still stuck at 9,999,991 : 0.4909739221107263