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MinorsLimit -- an option to limit the number of random minors computed

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

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

For the programmer

The object MinorsLimit is a symbol.


The source of this document is in RationalMaps.m2:1424:0.