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Topic: -- Lune and lens: correct definitions?
Replies: 9   Last Post: Mar 26, 2008 4:10 AM

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David W. Cantrell

Posts: 827
Registered: 7/2/06
Re: -- Lune and lens: correct definitions? - Also in Wikipedia
Posted: Jan 25, 2008 4:24 PM
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JEMebius <jemebius@xs4all.nl> wrote:

> >> "David W.Cantrell" <DWCantrell@sigmaxi.net> writes:
> >>

> >>> The notion of a crescent or lune was discussed recently in
> >>> alt.math.recreational. Interested readers might look at my second
> >>> posting (Nov. 12) in the thread "crescent shapes"

<http://groups.google.com/group/alt.math.recreational/msg/377799ffe126a44c>
[snip]
> Also take a look at http://en.wikipedia.org/wiki/Lune_%28mathematics%29

Thanks for the suggestion.

In my article in alt.math.recreational, to which I had provided a link, I
had already given links to the Wikipedia entries for both lune and lens.

Their entry for lune says "In plane geometry, a lune is a concave area
bounded by two arcs, necessarily of unequal radii." But I must suspect that
that last condition originated with MathWorld. As such, I do not think it
supports any necessity that the radii be unequal, but rather merely shows
how "contagious" errors can be.

David



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