New Closure Principle
We're in marking season at the moment, that most glorious time of year. The gloom is punctured from time to time by really awful exam scripts that make daft assertions. My colleague Jesper Kallestrup was marking a bunch the other day and came across this gem that I thought I'd share with you:
"According to Duncan Pritchard, Closure is the principle that if P knows Q, and Q entials R, then R knows P too."
It looks as if I've somehow single-handedly invented a new closure principle!
"According to Duncan Pritchard, Closure is the principle that if P knows Q, and Q entials R, then R knows P too."
It looks as if I've somehow single-handedly invented a new closure principle!
posted by Duncan Pritchard @ 7:45 PM
7 Comments:
At 12:51 PM,
Anonymous said…
Well, let's see. I know Jesper, and Duncan knows me, so that must mean Jesper entials Duncan. Cool.
At 3:21 AM,
Clayton Littlejohn said…
I can't think of a counterexample, can you?
So, nice work Duncan?
At 9:05 PM,
Duncan Pritchard said…
You know Clayton, you're right--I'll recall the script and make sure this student gets a First!
At 7:25 PM,
Anonymous said…
thanks very much for sharing!
At 7:59 PM,
j. adam carter said…
If Jesper knows Duncan, and Duncan competently deduces Jesper from Campbell, then Campbell is Jesper! This is all becoming clearer!
At 2:11 PM,
Anonymous said…
"Closure is the principle that if P knows Q, and Q entails R then R knows P too"
Duncan - "as well" or "also" would be better english.
I will publish my counterexample next week.
Nice try though!
At 2:52 PM,
Anonymous said…
If "B" knows "W", and "W" completely seduces "B" from "A", then "A" is "B"?
Sounds more like a soap opera to me...
S. Kidder
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