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Which of the Indicated Correspondence Defines Functions?

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Let P be the set of patients in a hospital, let D be the set of doctors on the hospital staff, and N be the set of nurses on the hospital staff. Which of the indicated correspondence defines functions? Explain.

(A) a patient corresponds to the doctor if that doctor admitted the patient to the hospital.

(B) A patient corresponds to the nurse if that nurse cares for the patient.

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The expert determines which of the indicated correspondence defines functions.

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A function that maps from set A to set B means that a single element in A corresponds to (target) a single element in B.
Note that several elements of A can correspond to the same element in B.

For example if A ...

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