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Looking for easy-to-understand examples for the spectrum of an operator, preferably so that they exposed some special properties. The right shift is a nice example of an operator which does not have a point spectrum. What is the simple most example of an operator which has all three spectra? Etc Cross-linking to other questions or websites is highly recommended.

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Example 1 math.stackexchange.com/questions/205477/… –  Anno2001 Nov 3 '12 at 10:09

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