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Fix OrderMul for negative numeric factors - #62
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Multiplying an order by a negative scalar no longer routes through Theta (which produced Undefined); negatives use FormalSub like __neg__.
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Summary
OrderMulwas wrapping every factor inTheta, so(-1)*Theta(x)became⊥*Theta(x)instead of matching-Theta(x).FormalSubsign (negative), consistent with__neg__.Test plan
PYTHONPATH=src pytest tests/test_order_mul.py(-1)*Theta(x) == FormalSub(0, Theta(x))and2*Theta(x) == Theta(x)