WWGD's latest activity
-
WWWGD posted the thread How to secure home network routers (Install security certificates)? in Computing and Technology.Hi, My home network router page is stored at a http:// xxx.xxx.x.xx address, thus not stored securely. As I understand, I must install...
-
WWWGD replied to the thread I Topic about physics axioms, theory, laws etc...Depends on which Math you refer to, as it splits on every undecidable statement. Choice or no Choice, Archimedean axiom holds in...
-
WWWGD reacted to user079622's post in the thread I Topic about physics axioms, theory, laws etc.. with
Like.
Does physics has axioms (like math), "fundamental blocks" from which we can build theory, laws and what are they? 1. How was it... -
WWWGD replied to the thread Random Thoughts 7.Seems like a law has been passed recently that requires authorization and disclosure of the use of your online data. Edit: Because I see...
-
WWWGD replied to the thread A What happens when an operator maps a vector out of the Hilbert space?.How do we define symmetric operators in infinite-dimensional (inner-product)spaces, is it <Tx,y>=<x, Ty>?
-
WWWGD replied to the thread A What happens when an operator maps a vector out of the Hilbert space?.The example I remember is that of ##l^2##, the sequence space. Choose an orthonormal Hamel basis ##\{e_i\}## , define ##T(e_i):=ie_i##...
-
WWWGD reacted to gentzen's post in the thread A What happens when an operator maps a vector out of the Hilbert space? with Like.
Zorn's lemma is your friend:
-
WWWGD reacted to SergejMaterov's post in the thread A What happens when an operator maps a vector out of the Hilbert space? with Like.
Exactly so—multiplication operators fit the same pattern as the differential ones: Multiplication by an unbounded function is...
-
WWWGD replied to the thread I Density matrix representation of a density operator.Isn't the support, i.e., the set of nonzero entries, countable?
-
WWWGD replied to the thread I Density matrix representation of a density operator.And you may even have a determinant, though not always, as you will have convergence issues.
-
WWWGD replied to the thread A What happens when an operator maps a vector out of the Hilbert space?.Including multiplication operators? Sorry, I am a bit rusty.
-
WWWGD replied to the thread A What happens when an operator maps a vector out of the Hilbert space?.Well, IIRC, the " default" unbounded operators are the differential ones. And symmetry has a Spectral theorem to go along with it...
-
WWWGD replied to the thread Collection of Lame Jokes.Well, you take some leeway, freedoms, to glue the joke together. And drink some Wattarr afterwards.
-
WCeltic Local Area Network?
-
WWWGD replied to the thread Collection of Lame Jokes.Internet down in Scotland. No access to LAN for the McLachlan clan.