Sunday, December 30, 2018

elementary set theory - Proving a bijection(injection and surjection) over a function

I need some help proving bijections:



Suppose f is a function from R2R2



Defined by



f(x,y)=(axby,bx+ay)



Where a,b are numbers with a2+b20




Prove that f is a bijection.



I understand that a function f is a bijection if it is both an injection and a surjection so I would need to prove both of those properties.



Could you give me a hint on how to start proving injection and surjection?



Thanks.

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