Let (X,A) be a measurable space. Show that any constant fuction is measurable
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Ohh come on. Try it yourself and we'll give you advice
I support mabruka's post.....
And if it can help you, a function f from X to Y is said to be (X,A)-(Y,B) measurable (where B is the sigma algebra associated to Y) if for any element O in B,
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