Talk:Kernel (linear algebra)

message: This article is about the kernel of a linear map. A linear map is called "linear operator" only in functional analysis, which is not the subject of this article. The problem lies in the fact that for most people and most WP articles using the concept of kernel, "linear map" is the standard name. I have encountered this problem by trying to disambiguate the links to kernel (mathematics) and finding that kernel (linear algebra) does not exists.
Thus I have edited the article to replace "operator" by "map" and I will move it to kernel (linear algebra) D.Lazard (talk) 11:47, 28 September 2012 (UTC)
thread_title:  Linear operator -> linear map 

message: I propose to merge this article with Kernel (matrix). I think the reasons are quite obvious to anyone familiar with the subject. The two concepts are so intimately related it is often beneficial to conflate them (in the finite-dimensional case, that is) or treat a kernel of a matrix like a special case of a kernel of a linear map. I also expect sources to discuss one in conjunction with the other. Keφr (talk) 19:59, 26 November 2012 (UTC)
thread_title:  Merger 

message: I respond to the request to clean up the problem "Decide whether to explain this in terms of linear maps or matrices, or preferably organize the different views. Remove redundancies. Clean up markup. Do something with short sections."
* I cast the matrix A as a representation of the mapping. This should make clear that multiplication by a matrix over a vector field z is a representation of a linear map, not exhaustive of the class of linear maps. 
* I changed "null space" to "kernel". If the article should instead use the term "null space", then perhaps the article title needs to be changed accordingly. 
* I gathered all definitions of terms that were independent of a matrix representation and separated out those that were being discussed entirely in a matrix multiplication context. 
* I refined the section now called “Illustration”. 
ArthurOgawa (talk) 04:18, 19 October 2014 (UTC)
thread_title: Improvements

message: Substituted at 02:16, 5 May 2016 (UTC)
thread_title: Assessment comment

message: The term "nullspace" seems to have been unfairly depricated here.  "kernel" is widely and ambiguously used  outside of
the math subfields, with different connotations particularly in modelling and computation.  Although there is 
a natural reason for this overlap because of Green functions for the heat equation correspond to both nullspaces and statistical distributions useful in smoothing, partial differential equations are not necessary for the understanding of either on their own.  In the current context,
the term "nullspace" suffers no such difficulties, and benefits for iconicity relating the concept immediately back to linear algebra theory where most students are first exposed to the concept.  — Preceding unsigned comment added by Uscitizenjason (talk • contribs) 16:34, 19 March 2017 (UTC)
replies: text: "Nullspace" is not deprecated here. The article's title comes that, in modern mathematics, kernel is presently more widely used, probably (this is a personal guess), because of the dual concept of cokernel (the duality between null space and quotient space is not clear from the terminology). However, a hatnote is lacking, which I'll add. D.Lazard (talk) 17:52, 19 March 2017 (UTC)
thread_title:  Nomenclature 

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thread_title:  External links modified 

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