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Equality test for zero ideals fails #795

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HechtiDerLachs opened this issue Nov 8, 2021 · 1 comment · Fixed by #811
Closed

Equality test for zero ideals fails #795

HechtiDerLachs opened this issue Nov 8, 2021 · 1 comment · Fixed by #811

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@HechtiDerLachs
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Try running this code:

  R, v = QQ["x", "y"]
  x = v[1]
  y = v[2] 
  f = (x^2 + y^2)
  I = ideal(R, zero(R))
  Q, _ = quo(R, I)
  I == modulus(Q)

It fails. Doing the same with

  I = ideal(R, f)

has no problem.
@thofma
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thofma commented Nov 12, 2021

Looking into this, this is fun!

thofma added a commit that referenced this issue Nov 12, 2021
@thofma
Fixes #795
1caedce 
The shortcut for zero-ideals used the wrong order.
@fingolfin fingolfin linked a pull request Nov 12, 2021 that will close this issue
Fixes #795 #811
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fingolfin pushed a commit that referenced this issue Nov 12, 2021
@thofma @fingolfin
Fixes #795
58d8ae7 
The shortcut for zero-ideals used the wrong order.
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Fixes #795 oscar-system/Oscar.jl
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@thofma @HechtiDerLachs