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Packages » RationalMaps :: MinorsLimit

Description

One of the ways to invert a map is to find a nonzero minor of a variant of the jacobianDualMatrix. This function controls how many minors (heuristically chosen via FastMinors) to check before switching to another strategy (involving computing a syzygy). Setting it to zero will mean no minors are checked. If it is left as null (the default), these functions will determine a value using a heuristic that depends on the varieties involved.

See also

• inverseOfMap -- inverse of a birational map between projective varieties

Functions with optional argument named MinorsLimit :

• inverseOfMap(...,MinorsLimit=>...) -- see inverseOfMap -- inverse of a birational map between projective varieties
• isBirationalMap(...,MinorsLimit=>...) -- see isBirationalMap -- whether a map between projective varieties is birational
• isBirationalOntoImage(...,MinorsLimit=>...) -- see isBirationalOntoImage -- whether a map between projective varieties is birational onto its image
• isEmbedding(...,MinorsLimit=>...) -- see isEmbedding -- whether a rational map of projective varieties is a closed embedding
• sourceInversionFactor(...,MinorsLimit=>...) -- see sourceInversionFactor -- computes the common factor among the components of the composition of the inverse map and the original map