Recent content by least_action

please delete my account. thank you.

N.B. I am not trying to send information back in time or generate infinite free energy (also I couldn't find how to delete the other thread but could a moderator please delete it for me) If you could send classical information signals faster than light, then according to relativity you could...

okay I have rewritten the question and started it in a new thread. please can someone delete this thread

yes it's grainy, in the QED lectures Feynman said that light is like rain if you get a very very weak source of light, then you can record a single photon of light at a time, for example

That's not what I'm asking about..

deleted

Thank you! I am starting to understand!

If I had a measuring device which causes decoherence of some quantum experiment: Is it possible to put (somehow) this observer/measuring device into a superposition of two different states? So instead of the wave function collapsing to ______/\______ it would collapse to __/\___/\__ (or...

What is an observation or measurement? If it is not known exactly I would like to at least have some good appreciation of what the fuzzyness of the boundary is.

:biggrin: yep it's awesome

Maybe because there is a cross product in 3D. In higher dimensions you can't form a cross product that takes vectors to vectors - you have to take vectors to bivectors (or whatever they are called). without a cross product (e.g. in 4D or 5D) how will you build a bicycle!

\frac{sin(x^2)}{x}

What part[s] are you having trouble with?

You can always solve ax + by = k \text{gcd}(a,b) (This is Bezout's identity and it is solved using the Euclidean algorithm). Clearly if x',y' solves ax' + by' = \text{gcd}(a,b) then x = kx', y = ky' solves ax + by = k \text{gcd}(a,b), Thus you only have to work on ax' + by' = \text{gcd}(a,b)...

How does one state the original question mathematically? (As one might do before attempting to prove it) You use the tensor product of dirackets to entangle states but how can you say the information cannot travel faster than light?