Opened 5 years ago

Closed 5 years ago

## #820 closed bug (fixed)

# Problems with adjointIdeal

Reported by: | Owned by: | somebody | |
---|---|---|---|

Priority: | major | Milestone: | 4-2-0 and higher |

Component: | singular-libs | Version: | 4-1-0 |

Keywords: | paraplanecurves.lib adjointIdeal | Cc: |

### Description

Dear maintainers,

I noticed that adjointIdeal seems to have some problems; quite probably with singularities "at infinity". Consider the following computation:

LIB "paraplanecurves.lib"; ring R = 0,(x,y,z),dp; poly f=x^3*y - x^2*z^2 + y^2*z^2 + y*z^3; adjointIdeal(f,1); ring R = 0,(y,z,x),dp; poly f=x^3*y - x^2*z^2 + y^2*z^2 + y*z^3; adjointIdeal(f,1);

The ordering of the variables shouldn't matter for the size of the ideal we get back, but in the first case we get (1) and in the second case we get (x,z). Is it possible to fix this?

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fixed with 49a28989c2ca5689cd39f7f688dc23dfdfe9764f