Opened 8 years ago

Last modified 8 years ago

## #675 new bug

# bug in reszeta

Reported by: | Owned by: | anne | |
---|---|---|---|

Priority: | minor | Milestone: | 4-1-0 and higher |

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

Keywords: | reszeta infinity point euler characteristic bug | Cc: |

### Description

observed by Tobias Rossmann:

LIB "reszeta.lib"; ring R=0,(x,y,z),dp; short=0; def f = x*y; list re = resolve(f, "A"); zetaDL(re, 1); f = x*y*z; re = resolve(f,"A"); zetaDL(re, 1);

output

> ring R=0,(x,y,z),dp; > short=0; > def f = x*y; > list re = resolve(f, "A"); > zetaDL(re, 1); [1] 2/(s2+2s+1) /// expected 1/(s2+2s+1) > f = x*y*z; > re = resolve(f,"A"); > zetaDL(re, 1); [1] (3s+4)/(s3+3s2+3s+1) /// expected 1/(s3+3s2+3s+1)

comment by Anne:
"in some cases points at infinity are not correctly considered
when computing Euler characteristic in `reszeta()`

"

see also https://github.com/jakobkroeker/test_singular/issues/76

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