**Authors:** Ding-Yu Chung

The unified theory of physics is based on both symmetry physics and contrast physics to unify all physical laws and phenomena, all four fundamental forces, and all elementary particles. Conventional symmetry physics preserves the physical features of a system under transformation by a symmetry operator. In unconventional contrast physics, yin and yang constitute a binary yinyang system of contrary physical properties by yin and yang operators. The three fundamental symmetry operators transform the three fundamental yinyang systems (inclusiveness-exclusiveness, rest-movement, and composite-individual) into the unified theory of physics. In the inclusiveness-exclusiveness system, a particle is transformed into boson with inclusive occupation of position by the integer spin operator, while a particle is transformed into fermion with exclusive occupation of position by the ½ spin operator. The fundamental symmetry operator is supersymmetry to result in M-theory and cosmology. In the rest-movement system, a moving massless particle (kinetic energy) is transformed into a resting massive particle (rest mass) by the attachment space (denoted as 1) operator to explain the Higgs field, while a resting massive particle is transformed into a moving massless particle by the detachment space (denoted as 0) operator to explain the reverse Higgs field. The fundamental symmetry operator is the symmetrical combination of attachment space and detachment space to bring about the three space structures: binary partition space, (1)n(0)n, for wave-particle duality, binary miscible space, (1+0)n, for relativity, and binary lattice space, (1 0)n, for virtual particles in quantum field theory. In the composite-individual system, particles are transformed into fractional charge quark composite by the fractional electric charge operator, while particles are transformed into integral charge particle individuals by the integral electric charge operator. The fundamental symmetry operator is the symmetrical combination of quarks, leptons, and bosons to constitute the periodic table of elementary particles which calculates accurately the particle masses of all elementary particles.

**Comments:** 17 Pages. Published in International Journal of Natural Science and Reviews, 2018; 2:6.

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