On 10/06/2011 07:09 PM, Warp wrote:
> Orchid XP v8<voi### [at] devnull>  wrote:
>> It's a bit like topology. A closed set is /not/ the opposite of an open
>> set. In fact, a single set can be both. Or neither.
>
>    How can a set be open and closed at the same time?

http://en.wikipedia.org/wiki/Clopen_set

Basically, the definition of "open" is unrelated to the definition of 
"closed". (An open set provides a way to distinguish between points. A 
closed set contains all limit points. Clearly one concept is unrelated 
to the other.)

Also: anything closely related to set theory tends to be incomprehensible.

>> Now figure out why inflammable means the exact same thing as flammable.
>
>    How about habitable and inhabitable?

"Team Bravo, you will guard this area here. This is an old mine field. 
Most of the mines are /inert/. However... some of them are ert. Be careful."

(3 points for naming the source...)

-- 
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*

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