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Eigenvalue, eigenvector and eigenspace

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Partial Self-nom. This article was a mathematics collaboration of the week and is the result of many mergings. This is a very central topic in mathematics and applied disciplines which is taught during the early university classes in mathematics. It is referred more than 450 times on Wikipedia. A big well-balanced effort has been put on pedagogics, properties and theorems, and applications. The article covers also eigenfunction and eigenstate which are now redirected here. Vb 13:10, 11 October 2005 (UTC)[reply]

  • Object 1) images are too large, esp. for smaller resolutions. Scale to between 220 to 270px. done 2) ToC is granulated, and contains too many subheadings. Specifically 5.1.x and 5.2.x should go. Rename 6 to something shorter.done =Nichalp «Talk»= 15:27, 12 October 2005 (UTC)[reply]
    • Point 1) has been addressed. Point 2) is not valid: This specific choice of titles and subtitles must be criticized on nonformal ground. This article is intended to a very large audience ranging from the layman to the mathematician. This particular choice of headings correspond to this. Applying blindly the FA criteria leads to an artificial uniformisation of WP which is not desired by many WPedians. Vb 08:19, 13 October 2005 (UTC) I did all you asked for blindly just to close the discussion. Vb 09:01, 13 October 2005 (UTC)[reply]
      • Please do not strike out a reviewer's objection. I evaluate all articles before objecting, and I never blindly apply the same formula to all articles. A single paragraph does not make a section and this criteria certainally applies to a mathematics article. Use the semicolon to create a non-sectional heading instead. See the ; in operation in the cricket article. =Nichalp «Talk»= 05:22, 14 October 2005 (UTC)[reply]
        • Yes. That's what I did: I have used the ";". I stroke out the part of your objections which are utterly objective and have been definitively addressed. Vb 09:12, 14 October 2005 (UTC)[reply]
    • I have some more issues:
      1. (from a vector space to itself) : "(" ")" deviates from the text, please avoid such a use in the lead.
        • This remark is important because we have to specify which type of transformations we are speaking about. I have put it as a footnote. Do you think it is better? Vb 17:36, 14 October 2005 (UTC)[reply]
      2. see Fig. 1, for an informal definition). --> not needed in lead
      3. Parentheses other, possibly nonlinear, transformations could also be listed)—may be visualized by the effect they produce on vectors (arrows pointing from one point to another). deviation: Please flow the text. (This applies to all such elements henceforth)
      4. See also: eigenplane --> unbold and use {{see also}}
      5. Earth rotates, earth is a common noun. use small caps.
      6. As another example, consider a thin the tone needs to be encyclopedic rather than text book style. "Consider" has to be removed.
      7. (see Spectral theorem) not necessary; already linked
        • I think we need it here to tell the reader where the particular conditions can be found
      8. This provides an easy proof that the geometric multiplicity is always less than or equal to the algebraic multiplicity. (Do not confuse this 1st sense with generalized eigenvalue problem, below.) same problem, this has to have an encyclopedic tone, and should not read like a manual. This applies to all elements again.
      9. Green's operator? Please explain
      10. =Factor analysis=, =Tensor of inertia=; =Tensor of inertia= need to be expanded to twice its current length to be called a section. Please expand or else use the semicolon.
        • I think it is important that the reader can see in the TOC which are the possible application or at least which are listed in this article. I therefore don't change this. Vb 17:36, 14 October 2005 (UTC)[reply]
    • I think there should be some introduction to ease a reader into the subject. That it has to do with matrices, vectors and so on. I do have some knowledge on EV, so I feel that the introduction should ease users into the subject. =Nichalp «Talk»= 16:40, 14 October 2005 (UTC)[reply]
    • I've edited the text to withdraw my objection. =Nichalp «Talk»= 15:18, 16 October 2005 (UTC)[reply]

It is a good idea to also have an informal introduction to the topic, without rigor, suitable for a high school student or a first-year undergraduate, as appropriate. For example,

In the case of real numbers, a continuous function corresponds to a graph that you can draw without lifting your pen from the paper, that is, without any gaps or jumps.

The informal introduction should clearly state that it is informal, and that it is only stated to introduce the formal and correct approach. If a physical or geometric analogy or diagram will help, use one: many of the readers may be non-mathematical scientists.

Thus I think it would be a bad idea simply to shift the definitions and examples from the body to the head. That's the reason why I made the Mona Lisa picture. I think the caption provides exactly what is required as a definition. To make this point clear I have numbered the figures and refer to Fig. 1 in the head. I think someone reading its caption will understand what is the topic even without much mathematics knowledge. Tell me whether you agree. Vb 09:12, 14 October 2005 (UTC)[reply]

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