Modification

of an analytic space

An analytic mapping $ f : X \rightarrow Y $ of analytic spaces such that for certain analytic sets $ S \subset X $ and $ T \subset Y $ of smaller dimensions, the conditions

$$ f : X \setminus S \rightarrow Y \setminus T \ \ \textrm{ is an isomorphism } $$

and

$$ f ( S) = T $$

hold. A modification is also called a contraction of $ S $ onto $ T $. An example of a modification is a monoidal transformation.

See also Exceptional analytic set; Exceptional subvariety.

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