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location  Oxford, United Kingdom  
age  51  
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17h

comment 
symmetrizability of generalised cartan matrix
either wikipedia is wrong, or this is by definition: en.wikipedia.org/wiki/Cartan_matrix en.wikipedia.org/wiki/Symmetric_matrix#Symmetrizable_matrix 
Dec 21 
comment 
Connected components $01$ matrices
By definition, the diagonal matrix $I$ is connected. 
Dec 21 
comment 
Connected components $01$ matrices
Conjugation is certainly much harder to deal with. 
Dec 21 
comment 
Connected components $01$ matrices
do you require simultaneous permutations of rows and columns (i.e. conjugation by a permutation matrix)? Or you allow different permutations to permute rows and columns? 
Dec 19 
comment 
Balanced binary code that “resists” local decoding?
the supports of the codewords either have empty intersection, or intersection of size $2^{k2}$. So the Hamming distance between any two is $2^{k1}$ or $2^k$. Thus the minimal distance is $2^{k1}$. 
Dec 18 
answered  An optimization problem in complex space 
Dec 18 
revised 
An optimization problem in complex space
tex corrections 
Dec 18 
revised 
Balanced binary code that “resists” local decoding?
texify k 
Dec 18 
comment 
Balanced binary code that “resists” local decoding?
Indeed, thanks for catching this. 
Dec 18 
revised 
Balanced binary code that “resists” local decoding?
fixed a typo 
Dec 18 
revised 
Balanced binary code that “resists” local decoding?
added missing index 
Dec 18 
comment 
Balanced binary code that “resists” local decoding?
there is a discrepancy in the definition of $k$ vs examples; e.g. your 1st example corresponds to $k=1$, according to your definition. 
Dec 18 
answered  Balanced binary code that “resists” local decoding? 
Dec 17 
revised 
finding dominating cycles in $2K_2$free graphs
clarified... 
Dec 17 
comment 
finding dominating cycles in $2K_2$free graphs
sure, that is right. 
Dec 17 
comment 
automorphism of prime order for group of Lie type in
You can have a look at the "Atlas of finite groups" by J.Conway et al., which has a lot of info on $O_8^+(\mathbb{F}_3)$. 
Dec 17 
revised 
finding dominating cycles in $2K_2$free graphs
missing word in the definition added 
Dec 17 
asked  finding dominating cycles in $2K_2$free graphs 
Dec 14 
comment 
when can I say that $UV^T$ is a permutation matrix?
"make an index"? what's that? 
Dec 14 
comment 
finding permutation matrix I which minimizes TRACE( I* C*( I^T)* D) matrix
you might like to check out arxiv.org/abs/1403.7721 for up to date references etc 