Nagel's Bottle-Opener-Corkscrew Argument By Aristotle

In Nicomachean Ethics in the first book, Aristotle claims that to discover the human good we must identify the function of a human-being. He argues that the human function is rational activity. Our good is therefore rational activity performed well, which Aristotle takes to mean in accordance with virtue. This argument has been criticized at almost every point. Aristotle's 'function' argument is defined in book one of his book Nimoachean Ethics. The purpose of the book is to discover the human good, identified as happiness, at which we ought to aim in life. Aristotle tells us that everyone refers to this "eudaimonia" Unlike other living things, humans are the only beings that have rational activity. This is the uniqueness of human function
Similarly, Nagel’s bottle-opener-corkscrew argument challenges Aristotle’s argument that every thing has a unique function. What is the unique, particular function of a special tool that consists of both bottle-opening and corkscrewing capabilities? It seems that such an object would have no special feature and thus no ergon at all. Indeed, it even raises the question as to why we couldn’t consider that there could be combined erga and that there could be objects with more than one
In this essay, I offer an account of what Aristotle means by ''function'' and what the human function is, drawing on Aristotle's metaphysical and psychological writings. I then reconstruct Aristotle's argument in terms of the results. My purpose is to defend the function argument, and to show that when it is properly understood, it is possible to answer many of the objections that have been raised to it. For reasons I will explain below, I think it is essential to make good sense of the function argument, because the theoretical structure of the Nicomachean Ethics collapses without it. Part of the defense is conditional, and shows only that if one held Aristotle's metaphysical beliefs, the function argument would seem as natural and obvious as it clearly seemed to him. But part of it is intended to be unconditional, and to show that, gien certain assumptions about reason and virtue, which, if not obvious, are certainly not crazy, the function argument is a good way to approach the question how to live