Parameter-Free Dual Models for Fractional Programming with Generalized Invexity

By parameter-free approach, we establish sufficient optimality conditions for nondifferentiable fractional variational programming under certain specific structure of generalized invexity. Employing the sufficient optimality conditions, two parameter-free dual models are formulated. The weak duality, strong duality and strict converse duality theorems are proved in the framework of generalized invexity.