Strong duality is a concept in optimization such that the primal and dual solutions are equivalent. This is as opposed to weak duality (the primal problem has optimal value not smaller than the dual problem, in other words the duality gap is greater than or equal to zero).
Contents
Characterizations
Strong duality holds if and only if the duality gap is equal to 0.
Sufficient conditions
References
Strong duality Wikipedia(Text) CC BY-SA