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Topic: Ultranet
Replies: 2   Last Post: Nov 16, 2012 2:49 AM

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William Elliot

Posts: 2,637
Registered: 1/8/12
Posted: Nov 15, 2012 4:28 AM
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What's an example of an universal or ultranet?

Wikipedia claims that if n:D -> X is an ultranet into X and
f:X -> Y, then the composition f.n:D -> Y is an ultranet into Y.

I dispute the claim but knowing of no examples
of ultranets, I'm bankrupt for a counter example.

Date Subject Author
Read Ultranet
William Elliot
Read Re: Ultranet
David C. Ullrich
Read Re: Ultranet
William Elliot

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