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How do i prove that :

$X$ is the hypersurface $wx=yz$ in $\mathbb{A}^{4}$ then $X$ is rational.

I do know the definition of $X$ being rational, but don't know how to apply that prove the above result.

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    We have to show that $X$ is a prevariety and it's function field $k[X] \cong \bar{k}(y_{1},\cdots,y_{n})$ for some $n$.2012-05-04
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    Can you describe the field of functions on $X$?2012-05-04
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    @MarianoSuárez-Alvarez: I think if $(x,y,w,z) \in \mathbb{A}^{4}$ then the set of all functions such that the product of the first and third co-ordinate = product of second and fourth co-ordinates.2012-05-04

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