Hello,
I have found that the current development snapshot (2010-01-10) and 
version 2.20 of HOL Light behave differently concerning the assumptions 
in SET_TAC. Assume the following example:

g(`~(x:num = y) /\ ~(x IN a DELETE y) ==> ~(x IN a)`);;

Then SET_TAC[] solves it immediately in both versions. However, if we do 
  also

e(REPEAT STRIP_TAC);;

then SET_TAC[] solves the goal in 2.20 but not in the current version. 
Is it a bug or it's the feature? If so, is there a way how to tell 
SET_TAC to use assumptions?
   Peter

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