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This article is extremely deficient. (1) No details, no intuition. (2) no good introduction (3) deals only with the LTI case...why? (4) there is no example
If anybody stumbles across this page who has the urge to fix it, please feel free to do so. — Preceding unsigned comment added by 74.198.165.54 (talk) 23:30, 8 October 2011 (UTC)