Determination involves the idea that the requirements associated with one thing include the requirements associated with another; and although properties are requiremental on their face, particulars are not. Hence the need for a notion of individual essence, where essential properties of a thing are those it cannot exist without. [T]he essence of a thing is supposed to be a measure of what is required in order to be that thing. Thus if more is required to be \(y\) than to be \(x\), this should b