question regrading tautology and valid formula

From: Min JIANG <mail.minjiang@xxxxxxxxx>
Date: Sat, 27 Oct 2007 15:03:33 -0000

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

.

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