What was Leon Walras hoping to prove through the development of a general equilibrium theory of markets? What are the properties of a general competitive equilibrium?

What was Leon Walras hoping to prove through the development of a general equilibrium
theory of markets? What are the properties of a general competitive equilibrium? Why is it
considered a state of efficiency? What does efficiency, in the sense of a Pareto Optimum, mean?
Did he prove the existence of a general competitive equilibrium?
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