Graduate How to Extend and Calculate a Basis for the Whole Space

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SUMMARY

This discussion focuses on extending and calculating a basis for the entire space R^n using given vectors. The method involves taking the cross product of two vectors, such as (2,1,0) and (2,0,2), to find a vector outside their plane, thus establishing a basis for R^3. For cases with m vectors in R^n, the systematic approach includes performing a change of coordinates to ensure that the n vectors have a 1 in the n-th position while all other components are zero, facilitating the extension of the basis.

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  • Understanding of vector spaces and bases in linear algebra
  • Familiarity with the cross product of vectors
  • Knowledge of coordinate transformations and change of basis
  • Concept of R^n and dimensionality in vector spaces
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Students and professionals in mathematics, particularly those studying linear algebra, as well as educators seeking to enhance their understanding of vector spaces and basis extension methods.

boderam
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For example, say you start out with (2,1,0) and (2,0,2). Well the easiest answer here is to think of these two vectors in a plane, so you should take the cross product to get the vector that is not in the plane, and there you have a basis for R^3. But how about when we run into similar problems in R^n, not just when we are given n-1 vectors, but perhaps any m less than n. What would be the systematic method?
 
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Do a change of coordinates so that the given n vectors are each zero except for a 1 in the n-th position. It should then be obvious how to extend.
 
How do you do the change of basis so this happens? My memory is vague about this.
 

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