Exercise 111.19.1. Consider the domain

\[ {\mathbf Q}[r, s, t]/(s^2-(r-1)(r-2)(r-3), t^2-(r + 1)(r + 2)(r + 3)). \]

Find a domain of the form ${\mathbf Q}[x, y]/(f)$ with isomorphic field of fractions.

Exercise 111.19.1. Consider the domain

\[ {\mathbf Q}[r, s, t]/(s^2-(r-1)(r-2)(r-3), t^2-(r + 1)(r + 2)(r + 3)). \]

Find a domain of the form ${\mathbf Q}[x, y]/(f)$ with isomorphic field of fractions.

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