In set theory, the complement of a set A, often denoted by (or A′), is the set of elements not in A.
When all elements in the universe, i.e. all elements under consideration, are considered to be members of a given set U, the absolute complement of A is the set of elements in U that are not in A.
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Everything, every-thing, or every thing, is all that exists; it is an antithesis of nothing, or its complement. It is the totality of things relevant to some subject matter. The universe is everything that exists theoretically, though a multiverse may exist according to theoretical cosmology predictions. It may refer to an anthropocentric worldview, or the sum of human experience, history, and the human condition in general. Every object and entity is a part of everything, including all physical bodies and in some cases all abstract objects.
To describe or know of everything as a spatial consideration in a local environment, such as the world in which humans mostly live, is possible. The detemination of all things in the universe is unknown because of the physics beyond the observed universe and the problem of knowing physics at the range infinite. To know universally everything as a temporal and spatial consideration isn't possible because of the unavailabilty of information at a certain time before the beginning of the universe and because of the problem of eternal causality.
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