Topic: Definition Morphism
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a morphism and y in Y a point, what is the definition of the sche...
Let k(y) be the residue field of the local ring O_{Y,y}. Then there is a canonical map Spec k(y) -> Y given by choosing an open affine neighborhood U = Spec(A) of y in Y, then noticing that A maps to O_{Y,y} and hence to k(y). Now let X_y b... Read More »
Source: http://ocw.mit.edu/courses/mathematics/18-726-algebraic-geometry-...
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Definition Morphism
