isSmooth( I )
This function returns true if $R/I$ is regular where $R$ is the ambient ring of $I$, otherwise it sets to false.
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If IsGraded is set to true (default false) then it treats $I$ as an ideal on $Proj R$ (and it assumes $R$ is standard graded over a field). In particular, singularities at the origin (corresponding to the irrelevant ideal) are ignored.
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The object isSmooth is a method function with options.