Re: question regrading tautology and valid formula
- From: Peter_Smith <ps218@xxxxxxxxx>
- Date: Sat, 27 Oct 2007 11:36:41 -0700
On 27 Oct, 16:03, Min JIANG <mail.minji...@xxxxxxxxx> wrote:
Hi, all,
I'm studying modal logic, but one problem puzzles me. Can someone help
me to understand the differentia between tautology and valid formula
in modal logic? or they are the same?
TIA
http://www.phil.cam.ac.uk/teaching_staff/Smith/modallogic/lecture01.pdf
Click through to the slide numbered 17.
.
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