isSNC( D )
This function returns true if the divisor is simple normal crossings, this includes checking that the ambient ring is regular.
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If IsGraded is set to true (default false), then the divisor is treated as if it is on the $Proj$ of the ambient ring. In particular, non-SNC behavior at the origin is ignored.
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The output value of this function is stored in the divisor's cache with the value of the last IsGraded option. If you change the IsGraded option, the value will be recomputed.
The object isSNC is a method function with options.