< Parametrisierung der pythagoreischen Tripel < Ringebene
Definiere unter Anlehnung an die Parametrisierung der pythagoreischen Tripel einen Ringhomomorphismus
![{\displaystyle \mathbb {Z} [X,Y,Z]/(X^{2}+Y^{2}-Z^{2})\longrightarrow \mathbb {Z} [U,V].}](../../../I/43f585f9d337f09737a35b041ad41d99cfaa5f46.svg)
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