bio  website  math.ubc.ca/~israel 

location  Vancouver BC  
age  63  
visits  member for  3 years, 4 months 
seen  33 mins ago  
stats  profile views  4,599 
Associate Professor Emeritus, University of British Columbia, and Optimization Algorithms Researcher, DWave Systems, Burnaby BC
30m

comment 
Number of Matrices with bounded determinant
What is this $n$? 
12h

awarded  ca.analysisandodes 
15h

comment 
Magic squares with specific properties
... and one for $k=428$: $$ \pmatrix{ 63 & 99 & 157 & 109 \cr 116 & 102 & 98 & 112 \cr 97 & 138 & 86 & 107 \cr 152 & 89 & 87 & 100 \cr }$$ 
19h

answered  Maximize combinatorial sum for boolean function 
20h

comment 
Maximize combinatorial sum for boolean function
$n$ and $t$ given, $t > 1$? $(n1)/t$ an integer? How did this problem arise? 
22h

comment 
Lack of parabolicity of PDE due to invariancy under diffeomorphisms?
Ah, so you're talking about invariance under all diffeomorphisms... 
22h

answered  Lack of parabolicity of PDE due to invariancy under diffeomorphisms? 
23h

revised 
Estimate maximal coefficient of a polynomial from a circle containing all roots
added 174 characters in body 
23h

answered  Estimate maximal coefficient of a polynomial from a circle containing all roots 
1d

comment 
Ergodic theory reference for converging sequences of matrices
What if $A_1 = 0$? 
1d

comment 
Magic squares with specific properties
@GerhardPaseman It doesn't work. I get 12 subsets besides rows and columns that sum to 430  43*4 = 258, e.g. entries (2,2), (2,3), (2,4), (3,2),(3,4): $47+51+50+46+64=258$. 
1d

answered  Magic squares with specific properties 
1d

comment 
Magic squares with specific properties
$k=430$ (must be getting close to optimality...): $$ \pmatrix{ 62 & 152 & 104 & 112 \cr 153 & 90 & 94 & 93 \cr 102 & 89 & 132 & 107 \cr 113 & 99 & 100 & 118 \cr }$$ 
1d

revised 
Identity involving shifted Legendre coefficients
added 58 characters in body 
1d

answered  Identity involving shifted Legendre coefficients 
1d

answered  Uniqueness of solution of a nonconvex optimization problem 
1d

comment 
Identity involving shifted Legendre coefficients
You don't want that $(1)^n$: it should be just $1/(4n^21)$. 
2d

awarded  nt.numbertheory 
2d

answered  Asymptotics and error terms for an arithmetic function built upon $\omega$ and $\Omega$ functions 
2d

comment 
Magic squares with specific properties
$k = 435$ using tabu search: $$ \pmatrix{ 109 & 104 & 148 & 74 \cr 85 & 106 & 82 & 162 \cr 123 & 115 & 111 & 86 \cr 118 & 110 & 94 & 113 \cr}$$ 