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'Show that the function `f: N-N` given by, `f(n)=n-(-1)^n` for all `n in N` is a bijection.'
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"Show that the function `f: N-N`
given by, `f(n)=n-(-1)^n`
for all `n in N`
is a bijection."
given by, `f(n)=n-(-1)^n`
for all `n in N`
is a bijection."