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What does "dominated by a rational variety" mean? edit
The section on Unirationality begins as follows:
"A unirational variety V over a field K is one dominated by a rational variety, so that its function field K(V) lies in a pure transcendental field of finite type (which can be chosen to be of finite degree over K(V) if K is infinite)."
But there is no explanation or link that defines what "dominated by a rational variety" means.
So this is an example of extremely poor mathematical writing in Wikipedia.
In the sense that a chain is only as strong as its weakest link, and an article is only as clear as its unclearest statement.
I hope someone knowledgeable about the subject can fix this problem.