High School Infinite dimensional Hilbert Space

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SUMMARY

The discussion centers on the concept of infinite-dimensional Hilbert spaces, clarifying that a Hilbert space can be either finite-dimensional or infinite-dimensional. Participants emphasize that infinite-dimensional Hilbert spaces consist of infinite sequences treated as infinite-dimensional vectors. The conversation also highlights that the image referenced is of David Hilbert himself, not an actual Hilbert space, and suggests that if a space is infinite-dimensional, it cannot be classified as a manifold. This distinction is crucial for understanding the properties of such spaces.

PREREQUISITES
  • Understanding of Hilbert spaces and their definitions
  • Familiarity with infinite-dimensional vector spaces
  • Knowledge of metric spaces and their properties
  • Basic concepts of manifolds and their classifications
NEXT STEPS
  • Study the properties of infinite-dimensional Hilbert spaces
  • Explore the differences between finite-dimensional and infinite-dimensional spaces
  • Learn about the classification of manifolds, particularly in relation to Banach manifolds
  • Investigate the implications of metric spaces in the context of Hilbert spaces
USEFUL FOR

Mathematicians, physicists, and students studying functional analysis or quantum mechanics, particularly those interested in the properties of Hilbert spaces and their applications in various fields.

kent davidge
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Could someone tell me in what sense the following photo of Hilbert is a infinite dimensional Hilbert Space?
xNNpZry.png


It's shown in a pdf I'm reading.

Perhaps I'm putting the chariot in front of the horses as one would say here in our country, by considering infinite as infinite dimensional?
 

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Are you sure this is meant literally? It may be a joke comment. A Hilbert space is a metric space. I don't see any mention , neither implicit nor explicit of any metric.
 
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A Hilbert space can be finite-dimensional or infinite-dimensional. The objects in an infinite-dimensional Hilbert space are infinite sequences, and are considered to be infinite-dimensional vectors.

The caption under the picture isn't a Hilbert space, obviously -- I believe it is merely commenting on what is probably his most well-known work.
 
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May be if you show pictures (a), (b), ..., (o) and the context of all this would be better.
 
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Here is the pdf https://web.stanford.edu/~jchw/WOMPtalk-Manifolds.pdf
 
Well, you can safely ignore that bit, these notes are not about Hilbert spaces. The picture is of course Hilbert himself, not a Hilbert space, perhaps it is supposed to be witty. If the space is infinite dimensional then it is not a manifold. I think that is the point to realize.
 
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martinbn said:
If the space is infinite dimensional then it is not a manifold.
Why that?
 
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Yes, but the notes from the link consider only manifolds that a locally ##\mathbb R^n##.
 
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Yes, there are Banach manifolds too, but it font know enough about them.
 
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