The conversation between human and AI assistant.
[|Human|] Give me a simple summary of idempotency
[|AI|] Idempotency is a mathematical property where if you apply an operation multiple times, the result remains the same -- just as if you had only applied the operation once. Idempotency can grant you at-most-once semantics.
[|Human|] 
Give me a simple summary of idempotency