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jbergman's latest activity
J
jbergman
reacted to
mathwonk's post
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I
3-parameter group of symmetries on the plane
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have you tried to answer this yourself? Let N be the null space of I-A, i.e. the null space of A-I. Then N is the subspace where A...
Tuesday, 10:18 PM
J
jbergman
reacted to
Euge's post
in the thread
POTW
Find the Dimension of a Subspace of Matrices
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Given a complex matrix ##A\in M_n(\mathbb{C})##, let ##X_A## be the subspace of ##M_n(\mathbb{C})## consisting of all the complex...
Sunday, 9:55 PM
J
jbergman
reacted to
pasmith's post
in the thread
I
3-parameter group of symmetries on the plane
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E(2) also includes reflections. The rotations and translations generate a subgroup SE(2) of this group. E(2) is a semidirect product of...
May 20, 2024
J
jbergman
reacted to
Will Flannery's post
in the thread
Physics education is 60+ years out of date
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<Mentor’s note: this thread is closed as a duplicate of...
May 18, 2024
J
jbergman
reacted to
PeterDonis's post
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I
Is time dilation a real effect?
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If we want to be more precise, we could say that Lorentz scalars are "invariant" while vectors, tensors, etc. that can be contracted to...
May 14, 2024
J
jbergman
reacted to
Vanadium 50's post
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Which theory of time is the most evidence-based?
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That's just stringing words together. People are being polite. It's nice that they are trying to help, but if you don't know what you...
May 12, 2024
J
jbergman
reacted to
Vanadium 50's post
in the thread
Studying
Handwritten Notes Improve Learning
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Did they show that? It seems that they showed that taking handwritten notes required more brain activity. This may be true, but a study...
May 10, 2024
J
jbergman
reacted to
Hornbein's post
in the thread
Studying
Handwritten Notes Improve Learning
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I was a graduate student in mathematics. Taking notes didn't help me at all. I had to learn from a textbook. I asked the other...
May 10, 2024
J
jbergman
reacted to
Nugatory's post
in the thread
I
EPR in Bohm formulation
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The entire Alice/Bob two labs thing is just an aid to visualizing the important part, that there are two detectors. When I was doing...
May 7, 2024
J
jbergman
reacted to
axmls's post
in the thread
I
Confused about basis vector notation
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I'd like to see what someone more knowledgeable says, but I'd like to point out that the correct notation would be ##V = V^a...
May 6, 2024
J
jbergman
reacted to
WWGD's post
in the thread
What are Good Books on Tensors for Understanding Einstein's Field Equation?
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John Lee's book on Riemannian Geometry may also be helpful .https://link.springer.com/book/10.1007/978-3-319-91755-9
May 4, 2024
J
jbergman
replied to the thread
A
X measurement modeled in non-separable Hilbert space
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I think it's fine to use his book if its on his site. As to your original question, I would say that eigen state like ##\ket{x}## isn't...
May 4, 2024
J
jbergman
replied to the thread
A
X measurement modeled in non-separable Hilbert space
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You could also just look at ##\|P_a\ket{\psi} - \ket{\psi}\|^2##, where ##\ket{\psi}## is in the Hilbert space with unit norm. Then, I...
May 4, 2024
J
jbergman
replied to the thread
A
X measurement modeled in non-separable Hilbert space
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What Hilbert space does ##\ket{x}## live in? Technically none as I understand it as it is a delta function.
May 3, 2024
J
jbergman
replied to the thread
I
Quantum particle's state in momentum eigenfunctions basis
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That's my understanding, yes.
Apr 28, 2024
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