15,469 reputation
14184
bio website zakuski.math.utsa.edu/~jagy
location Berkeley, California
age 58
visits member for 5 years, 6 months
seen 4 hours ago
My main activity is in number theory of integral positive ternary quadratic forms. This began through years of working with Irving Kaplansky. Much of his unpublished writing on quadratic forms can be found as pdfs at http://zakuski.math.utsa.edu/~kap/forms.html and about Lie and Jordan superalgebras at http://zakuski.math.utsa.edu/~kap/superalgebra.html One of my own email addresses can be found easily using the search feature at http://www.ams.org/cml and just putting in my last name

2d
comment To fast invert a real symmetric positive definite matrix that is almost similar to Toeplitz
math.stackexchange.com/questions/1349671/…
Jul
3
comment Non-Forking and Related Concepts
I see, not actually en.wikipedia.org/wiki/Forklift_truck
Jun
27
comment Can estimate upper bound of $|p_{i}|$ or $|q_{i}|?$
math110, exactly where did you get this problem?
Jun
26
comment Number of primes one larger than divisors of a fixed number, which is LCM of 1,2,3,…,L
@so-calledfriendDon, good, that seems to do it.
Jun
25
comment Number of primes one larger than divisors of a fixed number, which is LCM of 1,2,3,…,L
@ThomasSauvaget, I put in some parentheses. I like to use log and sin without parentheses around the argument, but i can see how that may be ambiguous in this expression.
Jun
25
revised Number of primes one larger than divisors of a fixed number, which is LCM of 1,2,3,…,L
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Jun
25
revised Number of primes one larger than divisors of a fixed number, which is LCM of 1,2,3,…,L
added 102 characters in body
Jun
25
asked Number of primes one larger than divisors of a fixed number, which is LCM of 1,2,3,…,L
Jun
14
comment Finding the square root of a special matrix
Annals of Mathematics, volume 41 (1940) pages 754-766, On the Rational Automorphs of $x_1^2 + x_2^2 + x_3^2.$ I suggest you also get Lam, ams.org/bookstore-getitem/item=gsm-67 since i think that part of your question is obstructions with coefficients in the field of rational functions $\mathbb F(x_1,\ldots, x_n)$ see also Rajwade, references at en.wikipedia.org/wiki/Hurwitz_problem
Jun
14
answered Finding the square root of a special matrix
Jun
11
answered From a (not positive definite) Gram matrix to a (Kac-Moody) Cartan matrix
Jun
8
comment Is there exist postive integer $x,y,z,w,n$ and $k$ such $x^{n},y^{n+k},z^{n+3k},w^{n+5k}$ be geometric sequence
crosspost math.stackexchange.com/questions/1317132/…
Jun
7
comment From a (not positive definite) Gram matrix to a (Kac-Moody) Cartan matrix
en.wikipedia.org/wiki/…
Jun
6
revised From a (not positive definite) Gram matrix to a (Kac-Moody) Cartan matrix
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Jun
6
revised From a (not positive definite) Gram matrix to a (Kac-Moody) Cartan matrix
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Jun
6
revised From a (not positive definite) Gram matrix to a (Kac-Moody) Cartan matrix
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Jun
6
revised From a (not positive definite) Gram matrix to a (Kac-Moody) Cartan matrix
added 310 characters in body
Jun
6
answered From a (not positive definite) Gram matrix to a (Kac-Moody) Cartan matrix
Jun
6
revised From a (not positive definite) Gram matrix to a (Kac-Moody) Cartan matrix
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Jun
6
revised From a (not positive definite) Gram matrix to a (Kac-Moody) Cartan matrix
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