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Topology

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Examples of Maps

TOPO-RGUP4G

Which of the followings are maps from $\mathbb{R}$ to $\mathbb{R}$?

Select ALL that apply.

A

$\{(n,s): s\text{ is the number of seconds in year }n\}$

B

$\{(x,y): x=y^3+y-1\}$

C

$\{(x,y):x^2-y^2=1\}$

D

$\{(\log(t),t):t\in\mathbb{R},t>0\}$