Question

f : (0, ∞) → (1, ∞) : x |-> 1+1/x^2

What does this mean in English? I'm having trouble understanding

Answer 1

For some reason the infinity sign has been replaced with question marks

Answer 2

f is defined as 1+(1/x^2) such that x is in (0, oo) or (x>0 in another notation)
f mapps every element of domain (0, oo) uniqely to other elements of Range: (1, oo)
the mapping is x===> 1+(1/x^2)

Answer 3

it is just the language we use to describe a certain function
in it's domain and related range

Answer 4

what do you mean by infinity has been replaced question marks? there is no such thing here?

Answer 5

@jbn123 don't ask a question and go wondering somewhere else