[YPNG] YPNG Friday 7 Aug 2015 at 11:00

[David Pollard]

Folks,

To ensure that we don't all forget about YPNG I'll fill in this week with a non-network topic:
Zorn's lemma, ultrafilters, and compactness.


I won't go through the whole argument for Zorn (see
https://urldefense.proofpoint.com/v2/url?u=https-3A__www.dropbox.com_s_ziyi7cgorgxjlzc_Zorn.pdf-3Fdl-3D0&d=AwIFAg&c=-dg2m7zWuuDZ0MUcV7Sdqw&r=V5RFj177zl_uvedej4jPpETqRnYdqAikrafH3LeyUoc&m=OnV8BUtilRNb8OIYLbX6nyfMYzF_b7fBDu6ZeMkwPoM&s=2b56fOx4gAYZXbL0pa22iBbUapR0jLA0tc7ogJbfyOg&e= 
) . Instead I'll mention a few ideas to show it is not so terrifying
if you believe in the Axiom of Choice.

David