Worked on enhancing logic inference reliability in the sympy/sympy repository by addressing a bug in the z3_satisfiable function. Focused on improving the handling of negated predicates, the solution involved updating the assertion logic to ensure that negated conditions are properly recognized during satisfiability checks. This targeted fix reduced edge-case failures in automated reasoning tasks and contributed to more accurate symbolic logic inference. The work demonstrated proficiency in Python, logic programming, and unit testing, with careful attention to maintainability and low-risk changes. The update strengthened downstream reliability for users relying on symbolic reasoning and satisfiability within the SymPy ecosystem.