"really is real" and everything is subject to history. This move is to historicize everything, even the laws of nature, and to challenge our acting as if time were real but not too real—we act as if it is somewhat real otherwise there would be no causal relations, but not so real that laws change. Unger holds that time is so real that laws of nature are also subject to its force and they too must change. There are no eternal laws upon which change occurs, rather time precedes structure. This position gives the universe a history and makes time non-emergent, global, irreversible, and continuous. Bringing these two thesis together, Unger theorizes that laws of nature develop together with the phenomenon they explain. Laws and initial conditions co-evolve, in the same that they do in how cells reproduce and mutate in different levels of complexity of organisms. In cosmological terms Unger explains the passing from one structure to another at the origins of the universe when the state of energy was high but not infinite, and the freedom of movement was greater than when operating under a known set of laws. The conditions of the early universe is compatible with the universe that preceded it. The new universe may be different in structure, but has been made with what existed in the old one, e.g. masses of elementary particles, strength of different forces, and cosmological constants. As the universe cools the phenomena and laws work together with materials produced by sequence; they are path dependent materials. They are also constrained by the family of resemblances of the effective laws against the background of the conceptions of alternative states the universe and succession of universes. Mathematics and the one real, time-drenched world One consequence of these positions that Unger points to is the revision of the concept and function of mathematics. If there is only one world drenched in time through and through, then mathematics cannot be a timeless expression of multiple universes that captures reality. Rather, Unger argues that mathematics is a means of analyzing the world removed of time and phenomenal distinction. By emptying the world of time and space it is able to better focus on one aspect of reality: the recurrence of certain ways in which pieces of the world relate to other pieces. Its subject matter are the structured wholes and bundles of relations, which we