Talk:Domain (mathematics)

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[edit] Removed expansion template

I've removed the {{expand}} template (and Oleg's comment that he had moved it from the main page). I think this article is, if anything, already too long for its subject matter; there's just not that much to say. --Trovatore 14:15, 6 January 2006 (UTC)

Good! :) Oleg Alexandrov (talk) 22:15, 6 January 2006 (UTC)

I would suggest adding a softer section at the beginning, or at least a disclaimer that this article assumes a fair comfort with set theory. I suspect many calculus and precalculus students (or their parents) that might want to look at an articles on domain and range would have a bit of trouble with this. I would try to write one but it looks like the consensus is not to expand the article. If it is worth it I would be glad to write something. Thenub314 13:13, 30 September 2006 (UTC)

If you can make the lead section more accessible (while keeping it accurate!) by all means do. That's not the sort of expansion we (if I may presume to speak for Oleg) are concerned about. "Expansion" suggests finding more to say, not saying it more understandably; I fear the only way to find more material about this topic is to let it devolve into trivia. --Trovatore 20:35, 30 September 2006 (UTC)

I find the opening far too difficult. 67.71.156.34 22:16, 5 October 2006 (UTC)

I conjecture that part of the confusion is from the fact that the article starts out with saying the codomain is the set of 'possible' output values and the range is the set of 'actual' output values. This is confusing to say the least, here 'possible' means all values that might be produced including those that cannot be produced for any input! This is only clear once the reader makes it all the way to 'actual outputs' in the next sentence. This would rather non-standard English usage of 'possible'. Wolfram Mathworld treats this topic point without creating confusion; see http://mathworld.wolfram.com/Codomain.html . An example or a link to one might help; there is a simple example at codomain. Perhaps some of the intro should be re-ordered? Many people probably make it through most of life, or at least secondary schooling, equipped with a fuzzy notion of range. Do we need to correct this just to explain the idea of domain? 24.226.31.7 05:47, 19 October 2006 (UTC)