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Second-order logic (explained in plain English)
by
philipn
on 6/20/2015, 9:29:03 PM with
1
comment
by
gnoway
on 6/20/2015, 11:45:25 PM
https://news.ycombinator.com/item?id=9703766
https://news.ycombinator.com/item?id=9703766