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idempotent

(adj): unchanged in value following multiplication by itself
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about 1 year ago John said:

"An idempotent operation in math is one that has the same effect whether you apply it once, or more than once. Multiplying a number by zero is idempotent: 4 x 0 x 0 x 0 is the same as 4 x 0."
- "RESTful Web Services," pg. 102.

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