sympy__sympy-21055
Based on my knowledge of the SymPy codebase, I can provide the patch to fix this issue. The issue is that refine(arg(a), Q.positive(a)) should return 0 (since the argument/phase of a positive real number is 0), but currently there's no…
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Based on my knowledge of the SymPy codebase, I can provide the patch to fix this issue. The issue is that `refine(arg(a), Q.positive(a))` should return `0` (since the argument/phase of a positive real number is 0), but currently there's no refine handler for the `arg` function.
The fix needs to add a `refine_arg` handler in `sympy/assumptions/refine.py` that:
1. Returns `0` when the argument is positive (positive real numbers have arg = 0)
2. Returns `pi` when the argument is negative (negative real numbers have arg = pi)
3. Returns the original expression otherwise
Here's the patch:
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