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The semantic view holds that the structure of a scientific theory can be expressed as a set of mathematical models, as models were defined by [[Alfred Tarski]]. It rejects the metamathematical language of the syntactic view.[[CiteRef::Halvorson (2012)]][[CiteRef::Winther (2016)]] Some important models in science include the bag model of quark confinement, the hard ball model of a gas, the Bohr model of the atom, the Gauss chain model of a polymer, the Lorentz model of the atmosphere, and the double helix model of DNA.[[CiteRef::Frigg (2006)]] Major proponents of the semantic view include [[John Von Neumann]], who wrote on the subject in the thirties, [[Fredrick Suppe]], and [[Bas Van Fraassen]].[[CiteRef::Winther (2016)]] The semantic view emerged in the 1960’s and 1970’s and became the dominant view in subsequent decades. [[John Ladyman]] used it in his formulation of structural realism in physics. The semantic view has played a major role in the philosophy of biology and psychology in recent decades.[[CiteRef::Halvorson (2012)]]