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cianfa72's latest activity
cianfa72
reacted to
Orodruin's post
in the thread
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3-parameter group of symmetries on the plane
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There is at least one homomorphism (although not necessarily a surjective nor injective one) between any two groups. Consider the map...
Today, 4:18 PM
cianfa72
replied to the thread
I
3-parameter group of symmetries on the plane
.
You mean the group homomorphism that map a translation + rotation (i.e. an element of ##E(2)##) to the corresponding element of...
Today, 4:16 PM
cianfa72
replied to the thread
I
3-parameter group of symmetries on the plane
.
Just to check my understanding: elements of ##E(2)## group of Euclidean plane isometries consist of: translations, rotations and...
Today, 2:33 PM
cianfa72
replied to the thread
I
Standing light waves if the one-way speed of light were not constant?
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I would add that the 2nd postulate of Einstein's SR is actually two folded. Namely in any inertial frame: the (two-way) speed of light...
Today, 1:28 PM
cianfa72
reacted to
Ibix's post
in the thread
I
Standing light waves if the one-way speed of light were not constant?
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See here. Changing the one way speed of light is just messing with your synchronization convention. It just changes your interpretation...
Today, 1:03 PM
cianfa72
reacted to
Ibix's post
in the thread
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Does Time Move Slower for Travelers in Special Relativity Experiments?
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Agreed. I'd still be dubious of explaining this as "clocks really do run slower" without saying "as measured using the Earth's rest frame".
Today, 9:23 AM
cianfa72
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phinds's post
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Does Time Move Slower for Travelers in Special Relativity Experiments?
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MisterT h as it wrong. Ignore what he said. I don't know any really advanced physics but I am VERY solid on this aspect of Special...
Today, 9:21 AM
cianfa72
reacted to
Dale's post
in the thread
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Does Time Move Slower for Travelers in Special Relativity Experiments?
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The correlation is the principle of relativity. If we had that in some frame a light clock slows down but a biological clock did not...
Today, 8:27 AM
cianfa72
replied to the thread
I
How is Potential Difference Created across a Resistor?
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The above questions arise from a basic doubt about how to use Maxwell's equations in any specific scenario. From my textbooks...
Today, 3:55 AM
cianfa72
reacted to
jbriggs444's post
in the thread
B
Weight and force of gravity
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Not a problem at all. Language issues are no one's fault. As I use the words, the force assignments are: "Normal force": The...
Yesterday, 2:19 PM
cianfa72
replied to the thread
I
3-parameter group of symmetries on the plane
.
Ok, so in ##(x,y)## coordinates it is $$K_1^{'}=K_1, K_2^{'}=K_2,K_3^{'}=K_3 + 3K_1 - 2K_2$$ One can extend it to any dimension...
Yesterday, 1:44 PM
cianfa72
replied to the thread
I
3-parameter group of symmetries on the plane
.
Suppose the point Q has coordinate ##(2,3)## in the given cartesian coordinates. How does one write a set of KVFs that includes the...
Yesterday, 1:37 PM
cianfa72
reacted to
anuttarasammyak's post
in the thread
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Motivation behind the Operator-Formalism in QM
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Let me say what I think for MOTIVATION you say. In CM we feel no necessity to distinguish between physical state and physical value...
Yesterday, 1:28 PM
cianfa72
reacted to
PeterDonis's post
in the thread
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Motivation behind the Operator-Formalism in QM
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If ##\hat{A}## represents an observable (and in principle any Hermitian operator can represent an observable), then a state...
Yesterday, 1:11 PM
cianfa72
posted the thread
I
3-parameter group of symmetries on the plane
in
Differential Geometry
.
Consider ##\mathbb R^2## as the Euclidean plane. Since it is maximally symmetric it has a 3-parameter group of Killing vector fields...
Yesterday, 12:47 PM
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