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Results tagged with reference-request
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user 48137
This tag is used if a reference is needed in a paper or textbook on a specific result.
3
votes
1
answer
688
views
Is each rationally chain connected surface rational?
Consider a 2-dimensional smooth projective algebraic surface S over complex numbers. Could you recommend any exact references to the proofs of the following assertions (of course, if they are true):
…
6
votes
1
answer
524
views
References to proofs of a theorem by Van Kampen-Flores
Theorem (Van Kampen-Flores 1930s) From any 7 points in four-dimensional space one can choose two disjoint triples such that the triangles with vertices at the triples intersect each other.
This theor …
6
votes
1
answer
2k
views
Why is the inverse of a bijective rational map rational?
Let $f:X\to Y$ be a bijective rational map of an open dense subset $X$ of $\mathbb{C}\times\mathbb{C}$ onto an open dense subset $Y$ of $\mathbb{C}\times\mathbb{C}$. How to prove that the inverse map …