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awarded Popular Question
Dec
10
awarded Popular Question
Nov
26
comment Busy beaver function vs low Turing degrees
Can you give the largest context or the subject in which one studies this? Do you have atextbook/review/lecture-note reference for this?
Nov
25
comment Is there an improvement for the Schur-Horn inequalities for positive semi-definite matrices?
@AllenKnutson Yes :P But this is not a trivial statement - right? The inequality for $A_{ii}$ that I wrote above comes because of the Schur-Horn inequality - right?
Nov
25
comment Is there an improvement for the Schur-Horn inequalities for positive semi-definite matrices?
@AllenKnutson About my second comment - what I mean is this - if $A$ is any Hermitian matrix then can I always say that $ (min-eigenvalue) \leq A_{ii} \leq (max-eigenvalue)$ ? (for any choice of basis) ?
Nov
25
comment Is there an improvement for the Schur-Horn inequalities for positive semi-definite matrices?
@AllenKnutson In the Schur-Horn inequalities can the diagonal entries be defined in any basis? (..because I am a bit confused by the statement here in equation 9 - terrytao.wordpress.com/2010/01/12/… - where Terence Tao seems to want to choose the "standard basis"..)
Nov
25
comment Is there an improvement for the Schur-Horn inequalities for positive semi-definite matrices?
@AllenKnutson I am not getting you - are you saying that any semi-definite matrix is also Hermitian and decomposable in some particular way such that the Schur-Horn can be used on the parts individually? Can you kindly elaborate?
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
23
comment Largest eigenvalue of the sum of hermitian matricies
@TerryTao Can you may be kindly help at this related question? mathoverflow.net/questions/187850/…
Nov
21
awarded Commentator
Nov
21
comment How to install Sage on Ubuntu?
@muru Is there some "sudo -apt get " styled installation method that will get me a 32-bit sage running for now?
Nov
21
comment How to install Sage on Ubuntu?
@muru And from where do I install that? And how can I do a fresh install of a 64 bit Ubuntu?
Nov
21
comment How to install Sage on Ubuntu?
@muru Can you explain how to do a fresh install? Like can I avoid having to burn a new disk? Are there versions of sage which work on 32 bit?
Nov
21
comment How to install Sage on Ubuntu?
@muru Any way to do a fresh install online?
Nov
21
comment How to install Sage on Ubuntu?
@muru How do I upgrade to a 64-bit Ubuntu?
Nov
21
comment How to install Sage on Ubuntu?
@muru uname -m says "i686"
Nov
21
comment How to install Sage on Ubuntu?
@muru I get the same errors as before after the last step, "Reading package lists... Done Building dependency tree Reading state information... Done Package sagemath-upstream-binary is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package 'sagemath-upstream-binary' has no installation candidate "
Nov
21
comment How to install Sage on Ubuntu?
Okay - so I have to just run those 3 commands one after another? - and nothing else? - how do i run sage after that?
Nov
21
comment How to install Sage on Ubuntu?
It said "trusty". I think I am on "14.04 LTS"
Nov
21
comment How to install Sage on Ubuntu?
Yes - anyway I can confirm?
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