A very basic question: can the null set be the domain of a function?

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The discussion centers on whether the domain of a function can be the null set. It questions if a function must have a non-empty domain by definition. Participants explore the implications of defining a function from set A to set B when A is empty. The concept of the empty function is referenced, indicating that a function can exist even if its domain is empty. Ultimately, the consensus is that while a function can be defined with an empty domain, it may not align with traditional expectations of function behavior.
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In other words, is the domain of a function by definition non-empty? (If I define a function from A to B should I take care to ensure that A is non-empty?)
 
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