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what is the definition of tautology? Give me some examples!!

tautology is the redundant use of words:
It is tautology to say, "Forward Planning", since planning alone already contains the whole idea. —Stephen 16:32, 3 May 2008 (UTC)
Well, technically "forward planning" could have a meaning distinct from "reverse planning". In AI it is relatively common to plan actions from both the current state towards a goal (forward), and from a goal state towards a current state (backwards). Sorry, couldn't resist. -Speed8ump 05:12, 18 February 2010 (UTC)
The expression provided as an example under "uncountable" strikes me as countable, since "Forward Planning" is but one expression, and the example sentence should be "(countable) "It is a tautology to say "Forward Planning"". In my opinion, "redundant use of words" is all that need be said under "(uncountable)". I am adding a more immediate example under (countable). RCopple 17:05, 25 May 2011 (UTC)

How about this example: " 'A tautology is a tautology' is a tautology" ? Kalleguld 04:04, 4 October 2011 (UTC)

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