R = the real numbers(adsbygoogle = window.adsbygoogle || []).push({});

A = R x R; [tex] (x,y) \equiv (x_1,y_1) [/tex] means that

[tex] x^2 + y^2 = x_1^2 + y_1^2; [/tex] B= {x is in R | x>= 0 }

Find a well defined bijection sigma : [tex] A_\equiv -> B [/tex]

like the last problem, I just cant seem to find the right way to solve this??

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# Equivalence relations problem #2 (alg)

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