The function f:R rarr B is defined by f(...

The function `f:R rarr B` is defined by `f(x)=[x]+[-x]` where [.] is G.I.F. is surjective then B is

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First and foremost, recall that ⌊x⌋=x , ⌈x⌉=x and {x}=0 , each precisely when x∈Z . When x∉Z , ⌊x⌋

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