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2021-09-06 14:48:39 +0100 | marked best answer | Define morphism of Q[i,w] in terms of i and w I want to construct the field $K=Q[i,w]$ where $w=\sqrt[4]{2}$ and define a field homomorphism such as $w\mapsto iw$, $i\mapsto -i$. I'd like to do but it doesn't work because $K$ is considered to be the relative field $(Q[i])[w]$. I know I could work with the absolute field but I'd really like to define the morphism in terms of $w,i$. Is it possible? |

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2021-09-06 10:35:27 +0100 | asked a question | Define morphism of Q[i,w] in terms of i and w Define morphism of Q[i,w] in terms of i and w I want to construct the field $K=Q[i,w]$ where $w=\sqrt[4]{2}$ and define |

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2020-06-10 23:21:36 +0100 | asked a question | Morphism from projective space to product of projective spaces I have a problem with creating a rational map from the projective plane to P^1xP^1. The following code gives the error " On the other hand, creating the "same" map on P^1xP^1 does not give an error: Can someone explain to me why it does not work and how I can go around this problem? |

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