By Ron MacKay, Don Greer
The 20 th Fighter crew joined the eighth Air strength Command in Dec of '43, flying the P-38 in lengthy variety bomber escort position. the gang later switched over to the P-51 in July of '44. the crowd destroyed a complete of 449 enemy plane in the course of its strive against travel. Over one hundred fifty photographs, eight pages of colour, eighty pages.
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18] S. Adler, Phys. Rev. 177, 2426 (1969); J. Bell and R. Jackiw, Nuovo Cimento. 51A, 47 (1969); W. Bardeen, Phys. Rev. 184, 1848 (1969).  D. Gross and R. Jackiw, Phys. Rev. D6, 477 (1972); C. Bouchiat, J. Illiopoulos, and Ph. Meyer, Phys Lett. 38B, 519 (1972). 1 The SU(2)L × U(1) Model of Glashow, Weinberg, and Salam In this section we will apply the ideas of spontaneously broken gauge theories to construct the ﬁrst successful model of the electroweak interaction of quarks and leptons. As we discussed in the Chapter 1 the observed universality of the four-Fermi coupling of weak-decay processes suggests the existence of a hidden symmetry of weak interactions, and the symmetry manifests itself not through the existence of degenerate multiplets but through broken local symmetries.
1 Symmetries and Their Realizations A Lagrangian for a physical system may be invariant under a given set of symmetry  transformations; but how the symmetry is realized in nature depends on the properties of the ground state. In ﬁeld theories the ground state is the vacuum state. We will, therefore, have to know how the vacuum state responds to symmetry transformations. Let U (ε) denote the unitary representations of the symmetry group in the Fock space of a given ﬁeld theory. 1) L(φ , ∂µ φ ) = L(φ, ∂µ φ).