One can see in the literature on metric fixed point theory that condition (1.1) has been extended and generalized by fixed point theorists in many ways for obtaining fixed points, common fixed points and, very recently, proximal points in different spaces.
This is a challenge to world systems theorists' predominant view that the state class structure is fixed.
As noted by the gender theorist Kristina Gupta (2012): Gender and sexuality are not fixed internal essences which are then expressed outwardly, but rather are complex states of "becoming" produced through the "intra-action" of internal and external factors.
No constitutional theorist would deny that many very specific or concrete constitutional provisions are fixed by the plain meaning of the text, by an understanding of the text that remains constant throughout the decades and possibly centuries.
Game theorists (and poker pros) will tell us that when faced with adaptive opponents, a fixed strategy is doomed.
Game theorists distinguish antagonistic situations called zero-sum games, in which one state's gain can be only at the expense of another state because the "payoff" is fixed.
Matthews's innovative approach was quickly adopted and improved by fixed point theorists (see, e.g., [3 27]) with the aim of discovering analogs of Banach's principle in the context of partial metric spaces to broaden its applications and enrich the fixed point theory as a result.
Most theorists on social inequalities propose solutions based on the assumption that the pool of resources is finite and that the questions to resolve are how to make re-distributions within that fixed pool.
As President Obama spends his Monday trying to fix Detroit's biggest problem, that pesky automobile industry, conspiracy theorists could have a field day on the timing: was he merely trying to distract from the catastrophe that became of his N.C.A.A. tournament bracket over the weekend?
Neoconservative theorists saw America exercising a benevolent hegemony over the world, using its enormous power wisely and decisively to fix problems such as terrorism, proliferation, rogue states, and human-rights abuses.
