给出无收据性的定义，并证明满足无收据性的充分必要条件。
This paper first gives out definition of receipt-freeness, and prove necessary and sufficient condition of receipt-freeness.
给出无收据性的定义，并证明满足无收据性的充分必要条件。
This paper first gives out definition of receipt-freeness, and prove necessary and sufficient condition of receipt-freeness.
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