Reputation
687
Next privilege 1,000 Rep.
Create tags
Badges
5 25
Impact
~32k people reached

Apr
9
awarded  Autobiographer
Mar
18
awarded  Popular Question
Feb
11
comment Is this graph and its spectrum understood?
^in the above link it says that the two vertices are adjacent iff the two vertices are at a distance $2$ in the original graph. But in the post the two vertices can be at distance one too.
Feb
11
comment Is this graph and its spectrum understood?
Are you sure this is the same thing? The definition here doesn't seem to match, mathworld.wolfram.com/HalvedCubeGraph.html
Jan
13
awarded  Popular Question
Dec
19
awarded  Popular Question
Nov
24
suggested rejected edit on An analytic characterization of eigenvalues of a Hermitan matrix.
Nov
23
comment Largest and smallest eigenvalues of a hermitian matrix
May be you can also help at this related question, mathoverflow.net/questions/187850/…
Nov
15
awarded  Popular Question
Nov
13
accepted An argument from a blog article of Terence Tao
Nov
9
awarded  Yearling
Nov
9
comment An argument from a blog article of Terence Tao
Thanks! Firstly are your ellipsis in the wrong place in the last line? Secondly, hows does the positive-definiteness of the skew-adjoint part follow from what you said? [..I believe that a matrix $A$ is called positive-definite if $x^\dagger A x >0$ for all vectors $x \neq 0$ - right?..] Then you say that this skew-adjoint form satisfies this and the self-adjoint form also satisfies this trivially? Is it? (all because of the "z" term that the semi-definiteness of the $A_i$s get lifted to positive-definiteness of the $A$ - right?)
Nov
8
asked An argument from a blog article of Terence Tao
Nov
8
awarded  Popular Question
Jul
2
awarded  Popular Question
Jul
2
awarded  Curious
Jul
2
awarded  Inquisitive
Jun
2
awarded  Popular Question
May
14
awarded  Popular Question
Mar
14
awarded  Popular Question