Reading Question A.1.2. Consider the equivalence relation on R² given by: ỹ + ||x|| = ||J||. Select all that apply. (a) For every vector , we have -I (b) The equivalence class of a vector i consists of +ĩ. Namely: [] = {x, –x} (c) The equivalence class of a vector i consists of the circle centerered at the origin of radius ||||. (d) The map T: R20 → R2/ ~, r [X,] where , := (r,0) is a bijection between the set of non-negative real numbers and the quotient set R?/ ~.

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