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Using SageMath 8.8, I encountered a strange error involving boolean tests. The following code reproduces the issue:

x, y = var('x, y')
assume(x>0)
assume(y>0)
bool(y*(x-y)==0)

RuntimeError: ECL says: C-STACK overflow at size 1048576. Stack can probably be resized. Proceed with caution.

This code should obviously return False. Changing y*(x-y) to x*(y-x) indeed returns False, which means x and y cannot be exchanged. Without the assumptions, the code works as expected.

I initially though it was due to my Sage installation, but running this code on https://sagecell.sagemath.org/ also produces asymmetric behavior, though no error comes out (just a blank answer).

Is this a known issue ? Can someone reproduce this ?

Using SageMath 8.8, I encountered a strange error involving boolean tests. The following code reproduces the issue:

x, y = var('x, y')
assume(x>0)
assume(y>0)
bool(y*(x-y)==0)

RuntimeError: ECL says: C-STACK overflow at size 1048576. Stack can probably be resized. Proceed with caution.

This code should obviously return False. Changing y*(x-y) to x*(y-x) indeed returns False, which means x and y cannot be exchanged. Without the assumptions, the code works as expected.

I initially though it was due to my Sage installation, but running this code on https://sagecell.sagemath.org/ also produces asymmetric behavior, though no error comes out (just a blank answer).

Is this a known issue ? Can someone reproduce this ?

Using SageMath 8.8, I encountered a strange error involving boolean tests. The following code reproduces the issue:

x, y = var('x, y')
assume(x>0)
assume(y>0)
bool(y*(x-y)==0)

RuntimeError: ECL says: C-STACK overflow at size 1048576. Stack can probably be resized. Proceed with caution.

This code should obviously return False. Changing y*(x-y) to x*(y-x) indeed returns False, which means x and y cannot be exchanged. Without the assumptions, the code works as expected.

I initially though it was due to my Sage installation, but running this code on https://sagecell.sagemath.org/ also produces asymmetric behavior, though no error comes out (just a blank answer).

Is this a known issue ? Can someone reproduce this ?

Using SageMath 8.8, I encountered a strange error involving boolean tests. The following code reproduces the issue:

x, y = var('x, y')
assume(x>0)
assume(y>0)
bool(y*(x-y)==0)

RuntimeError: ECL says: C-STACK overflow at size 1048576. Stack can probably be resized. Proceed with caution.

This code should obviously return False. Changing y*(x-y) to x*(y-x) indeed returns False, which means x and y cannot be exchanged. Without the assumptions, the code works as expected.

I initially though thought it was due to my Sage installation, but running this code on https://sagecell.sagemath.org/ also produces asymmetric behavior, though no error comes out (just a blank answer).

Is this a known issue ? Can someone reproduce this ?

Using SageMath 8.8, I encountered a strange error involving boolean tests. The following code reproduces the issue:

x, y = var('x, y')
assume(x>0)
assume(y>0)
bool(y*(x-y)==0)

RuntimeError: ECL says: C-STACK overflow at size 1048576. Stack can probably be resized. Proceed with caution.

This code should obviously return False. Changing y*(x-y) to x*(y-x) indeed returns False, which means x and y cannot be exchanged. Without the assumptions, the code works as expected.

I initially thought it was due to my Sage installation, but running this code on https://sagecell.sagemath.org/ also produces asymmetric behavior, though no error comes out (just a blank answer).

Is this a known issue ? Can someone reproduce this ?

Using SageMath 8.8, I encountered a strange error involving boolean tests. The following code reproduces the issue:

x, y = var('x, y')
assume(x>0)
assume(y>0)
bool(y*(x-y)==0)

RuntimeError: ECL says: C-STACK overflow at size 1048576. Stack can probably be resized. Proceed with caution.

This code should obviously return False. Changing y*(x-y) to x*(y-x) indeed returns False, which means x and y cannot be exchanged. Without the assumptions, the code works as expected.

I initially thought it was due to my Sage installation, but running this code on https://sagecell.sagemath.org/ also produces asymmetric behavior, though no error comes out (just a blank answer).

Is this a known issue ? Can someone reproduce this ?