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- Tags: - #todo/untagged - Refs: - #todo/add-references - Links: - exceptional divisor - simply normal crossings divisor - Cartier divisor

log discrepancy

• A map is crepant if the pullback of the canonical divisor is again the canonical divisor.
• The discrepancy divisor of a crepant resolution \(h : Y \to X\) is zero by definition.