Can a vector space also be a set?

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Discussion Overview

The discussion revolves around the relationship between vector spaces and sets, particularly whether a vector space can be considered a set. Participants explore the definitions and properties of vector spaces, including examples such as the vector space of polynomials of degree 2, and the implications of linear combinations within sets.

Discussion Character

  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant questions the distinction between a vector space and a set, suggesting that a vector space could be viewed as a set of objects that can be added and scaled.
  • Another participant asserts that a vector space is indeed a set but emphasizes that it must also have an algebraic structure and specific properties to qualify as a vector space.
  • There is a query about whether a set of vectors that can be linearly combined constitutes a linear vector space, indicating a potential overlap between the concepts of sets and vector spaces.
  • A participant mentions the existence of other mathematical structures beyond vector spaces, such as groups, monoids, modules, rings, and fields, suggesting a broader context for understanding mathematical spaces.

Areas of Agreement / Disagreement

Participants express differing views on the nature of vector spaces and sets, with no consensus reached on whether a vector space can simply be considered a set. The discussion remains unresolved regarding the implications of linear combinations and the definitions involved.

Contextual Notes

Participants do not fully explore the mathematical properties that differentiate a vector space from a mere set, leaving some assumptions and definitions implicit. The discussion also does not clarify the specific conditions under which a set can be classified as a vector space.

ognik
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Wiki says "A vector space is a collection of objects called vectors, which may be added together and multiplied ("scaled") by numbers, called scalars in this context." To me the term (linear) Vector Space has always seemed a little mysterious ... how far wrong would I be in thinking of a vector space as a set? For example if it was the vector space of polynomials of degree 2, could I also say the set of polynomials of degree 2 (or lower of course)?

If not, what is superior about a Vector Space as opposed to a set?
 
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A vector space is a set, combined with an algebraic structure. A mere set does not satisfy a vector space properties. Whenever a set has certain operations defined on it and behave in a certain way, it is called a vector space. :)
 
Thanks Fantini. So if I have a set of vectors and I say they can be linearly combined, then I have a linear vector space?

I suppose there are mathematical spaces that have other than vectors? And other than linear algebra associated?
 
ognik said:
Thanks Fantini. So if I have a set of vectors and I say they can be linearly combined, then I have a linear vector space?

I suppose there are mathematical spaces that have other than vectors? And other than linear algebra associated?
If you have a set and they can be linearly combined, then they are vectors because they live in a set that is a linear vector space. :) You can only call them vectors if you have a vector space.

There are other mathematical structures different from vector space. You can have a group, a monoid, a module, a ring, a field...there are ample possibilities (though I don't know enough to explain them in detail).
 

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