jbergman's latest activity
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Jjbergman replied to the thread Books vs Screens for Learning.Paper is more relaxing. Something about screens annoys me. The only exception are Kindle Paperwhites.
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Jjbergman replied to the thread Graduate Equivalent definitions of tensor field.Yes. In Lee's book, he defines a smooth functor with which you can lift constructions on vector spaces to vector bundles...
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Jjbergman replied to the thread Graduate Equivalent definitions of tensor field.The second doesn't look correct. It should be a multilinear function of sections of the tangent space, not the cotangent space. It's...
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Jjbergman reacted to Morbert's post in the thread Graduate Understanding Barandes' microscopic theory of causality with
Like.
As a quick aside: People like Peres and Fuchs only maintain that a theory that describes a microscopic reality and reproduces the... -
Jjbergman reacted to PeroK's post in the thread Undergrad Sean Carroll's description of the Many Worlds interpretation with Like.
The ##\alpha## and ##\beta## apply initially to the state of an electron, but after the interaction with a measuring device, they apply...
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Jjbergman replied to the thread Graduate Trivial fiber bundle vs product space.Not following all the arguments that closely but I think I agree with Martin. Once you learn some category theory, products are defined...
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Jjbergman reacted to martinbn's post in the thread Graduate Trivial fiber bundle vs product space with Like.
Yes, but what is the difference? You say that one is canonical and the other not, but in what sense. If you have that ##A\times B## is...
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Jjbergman reacted to martinbn's post in the thread Graduate Trivial fiber bundle vs product space with Like.
What is canonical about a product? A product ##A\times B## can be written as a product in many ways, say as ##A\times f(B)## for any...
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Jjbergman reacted to PeroK's post in the thread Finding the number of ways to arrange identical balls in a circle (3 different colors) with Like.
The idea of fixing the yellow ball is that it picks out the set of solutions that cannot be equivalent under rotation. If there were...