Zeige, dass in R = R [ Q ≥ 0 ] {\displaystyle {}R=\mathbb {R} [\mathbb {Q} _{\geq 0}]} das Element X 2 + 1 {\displaystyle {}X^{2}+1} nicht irreduzibel ist.
![{\displaystyle {}R=\mathbb {R} [\mathbb {Q} _{\geq 0}]}](https://wikimedia.org/api/rest_v1/media/math/render/svg/7b98ef337fec8ec628a20e0f5d9d66590a3a9cfa)
