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Difference between revisions of "Talk:Elementary matrix"

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== References ==
 
== References ==
 
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--[[User:Neo razgriz|Ben Paradise]] ([[User talk:Neo razgriz|talk]]) 14:24, 20 March 2015 (CET)
  
  
 
== Comments ==
 
== Comments ==
--[[User:Neo razgriz|Ben Paradise]] ([[User talk:Neo razgriz|talk]]) 14:24, 20 March 2015 (CET)
 
  
 
: Thank you.  Probably you are right.  But, being not an algebraist, I am not sure: maybe different (non-equivalent) definitions are in use? [[User:Boris Tsirelson|Boris Tsirelson]] ([[User talk:Boris Tsirelson|talk]]) 19:13, 20 March 2015 (CET)
 
: Thank you.  Probably you are right.  But, being not an algebraist, I am not sure: maybe different (non-equivalent) definitions are in use? [[User:Boris Tsirelson|Boris Tsirelson]] ([[User talk:Boris Tsirelson|talk]]) 19:13, 20 March 2015 (CET)

Revision as of 21:14, 20 March 2015

Issue

This definition excludes the row-switching elementary matrix[1]:


16c94d719d94fe7b7a397a59d781be2b.png


Proof

The matrix above (marked T) has more than one off-diagonal element added to it.

In addition, at least one diagonal element has been modified.

Therefore, by the definition on the Elementary matrix page, T is not an elementary matrix.


Alternative definition (example)

Wikipedia defines elementary matrix in the following manner:

In mathematics, an elementary matrix is a matrix which differs from the identity matrix by one single elementary row operation.[2]

Although this definition requires elementary row operations to be defined, the matrix that matches the Row-switch operation is "elementary", by this definition.


References


--Ben Paradise (talk) 14:24, 20 March 2015 (CET)


Comments

Thank you. Probably you are right. But, being not an algebraist, I am not sure: maybe different (non-equivalent) definitions are in use? Boris Tsirelson (talk) 19:13, 20 March 2015 (CET)
Thanks for the reply! I also noticed that the same issue exists for Row-multiplying transformations.
Theorems regarding the connection between elementary row operations and elementary matrices are based on this definition.
Pending review by an Algebraist. --Ben Paradise (talk) 19:49, 20 March 2015 (CET)
How to Cite This Entry:
Elementary matrix. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Elementary_matrix&oldid=36342