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Is signum function a bijective function?

Answer:
The signum function is defined as follows:

f(x) = -1 if x < 0
= 0 if x=0
= 1 if x > 0

It is not one-to-one (bijective) as can be easility seen).
f(2)=1
f(3)=1
f(10)=1
and so on.
First answer by Norwiki. Last edit by Norwiki. Contributor trust: 5 [recommend contributor recommended]. Question popularity: 3 [recommend question].

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