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3h
awarded  Scholar
3h
accepted Hamilton operator in absence of causal order?
Jul
26
revised When can two quantities be added together?
addressing concerns for duplicate, going more in-depth - hopefully not too much so
Jul
26
asked When can two quantities be added together?
Jul
21
comment What is the link between the density matrix and Hestenes' spinors in geometric algebra?
Perhaps this paper helps? arxiv.org/pdf/quant-ph/0004031v3.pdf - it covers a lot more than your question but if you just search the document for "density" you should get your answer in various stages of generality.
Jun
9
comment Differences between pure/mixed/entangled/separable/superposed states
The example "superposed" state should be |0>+|1> rather than |1>+|1>, right? As is, it would not be normalized: its squared norm would be 2 since you could simply add the two same states together.
Mar
4
revised Is it possible for a physical object to have a irrational length?
made image be alligned with text nicer
Mar
4
comment Is it possible for a physical object to have a irrational length?
hah thanks, it was a simple render in Blender Cycles. (Look it up if you don't know it. It's neat.) Three refractive bluish spheres, one lightsource in the middle above them in the same location as the camera, if I recall correctly. It's been a while though. - Not exactly related to the question but I felt like being a bit fancy :)
Jan
28
comment Is it possible for a physical object to have a irrational length?
@Jerry Well, yeah, it is possible to have an object with rational length. You only need to adjust the infinitely accurate scale so that a given length becomes exactly rational. However, if you keep a fixed scale such that one length becomes rational, it should always be possible (to the point where it's trivial) to find a length that is irrational.
Jan
27
revised Is it possible for a physical object to have a irrational length?
added 32 characters in body
Jan
27
comment Is it possible for a physical object to have a irrational length?
I think, comming up with a scale like that isn't what the question asks for: Take the right Isosceles triangle in the example. It assumes that you meassure the side-lengths with length 1 and thus, the hypothenuse has to be $/sqrt{2}$. The question essentially is: Given you use an infinitely accurate scale in which one of the sides comes out rational, would, on a physical level, all sides be rational (two of them of miniscully different length) or could two of them possibly be exactly the same, making the third side irrational? (or the third side could be rational and the other two irrational.)
Jan
27
revised Is it possible for a physical object to have a irrational length?
minor correction
Jan
27
awarded  Teacher
Jan
27
revised Is it possible for a physical object to have a irrational length?
additional information; minor correction
Jan
27
answered Is it possible for a physical object to have a irrational length?
Jan
14
revised What is non-thermal plasma?
grammar and formating
Jan
14
revised Does high entropy means low symmetry?
various grammar and writing style edits
Jan
14
awarded  Editor
Jan
14
revised Does high entropy means low symmetry?
accounting for edits of question and formating
Jan
14
suggested approved edit on Does high entropy means low symmetry?