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mathwonk's latest activity
M
mathwonk
reacted to
symbolipoint's post
in the thread
How to become brilliant?
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Like
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So many posts on this topic already! If you want to be "brilliant", it is not usually done overnight. Effort and Preparation! Repeated...
Saturday, 4:53 PM
M
mathwonk
reacted to
pasmith's post
in the thread
Continuous functions on metric spaces
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Like
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You should start a new thread. Note that this new question is a generalization of the question you posted in this thread.
Saturday, 11:11 AM
M
mathwonk
replied to the thread
POTW
Sum of an Alternating Series
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As those know who learned precalculus from Euler, (Intro. to Analysis of the Infinite, paragraphs ##174-175##, one can deduce from his...
May 14, 2024
M
mathwonk
replied to the thread
True or false problem for double differentiable function
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the thing that puzzled me is that the original statement was true in all my examples (since the hypothesis implies the left part of the...
May 13, 2024
M
mathwonk
replied to the thread
Given specific v, dimension of subspace of L(V, W) where Tv=0?
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Everything here looks correct to me, (except for the unsigned generic statements appended at the end), but I suggest looking at it a...
May 9, 2024
M
mathwonk
replied to the thread
Linear Algebra Determinant proof
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note that geometrically this is the fact that the area of a parallelogram equals that of the rectangle with same height and base.
May 7, 2024
M
mathwonk
replied to the thread
What are Good Books on Tensors for Understanding Einstein's Field Equation?
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Orodruin to the rescue! As Orodruin makes clear, a map from T to T*, (where T is the tangent space), corresponds to a tensor of type...
May 7, 2024
M
mathwonk
reacted to
Orodruin's post
in the thread
What are Good Books on Tensors for Understanding Einstein's Field Equation?
with
Love
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That would be the cosmological constant term. You can either keep it on the LHS or move it to the RHS and consider it part of the...
May 6, 2024
M
mathwonk
replied to the thread
What are Good Books on Tensors for Understanding Einstein's Field Equation?
.
To someone like me, i.e. me, who knows nothing of this, and never heard of Einstein's field equations before, wikipedia looks actually...
May 6, 2024
M
mathwonk
replied to the thread
What are Good Books on Tensors for Understanding Einstein's Field Equation?
.
Ok, so I think of it this way now: in physics there are various operations on (fields of) vectors taking them linearly or multi-linearly...
May 5, 2024
M
mathwonk
replied to the thread
What are Good Books on Tensors for Understanding Einstein's Field Equation?
.
Ah yes, proceeding from Orodriuin's guidance, we can see what kind of tensor the Riemann curvature should be: We need the basic...
May 5, 2024
M
mathwonk
replied to the thread
What are Good Books on Tensors for Understanding Einstein's Field Equation?
.
You are reminding me of how stunned I was when my professor asked why I was so sure, when given a function f(x), that x was the...
May 5, 2024
M
mathwonk
replied to the thread
What are Good Books on Tensors for Understanding Einstein's Field Equation?
.
well I was enjoying the excerpt of Biennow on amazon...
May 4, 2024
M
mathwonk
replied to the thread
What are Good Books on Tensors for Understanding Einstein's Field Equation?
.
Well a quick look at Wikipedia shows that the output of a tensor can be more general than a function, e.g. the Riemann curvature tensor...
May 4, 2024
M
mathwonk
replied to the thread
What are Good Books on Tensors for Understanding Einstein's Field Equation?
.
I am a mathematician, and to me, if you already know what the tangent bundle is, and its dual the cotangent bundle, and hence know what...
May 4, 2024
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