Question: Explanation would be nice please! Find a function f : Z - Z with the property that all fibres have exactly two elements. Answer: Let

Explanation would be nice please!

Find a function f : Z - Z with the property that all fibres have exactly two elements. Answer: Let f : A - A be a function. True or False? If f[U] C U for all U C A then f is injective. Answer:

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