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Group-Theoretic Bifurcation Theory

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Imperfect Bifurcation in Structures and Materials

Part of the book series: Applied Mathematical Sciences ((AMS,volume 149))

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Abstract

Group-theoretic bifurcation theory is introduced as a means to describe qualitative aspects of symmetry-breaking bifurcation, such as possible types of critical points and the symmetry of bifurcating solutions. We advance a series of mathematical concepts and tools, including: group equivariance, Liapunov–Schmidt reduction, equivariant branching lemma, and block-diagonalization. The theory of linear representations of finite groups in Chap. 7 forms a foundation of this chapter. This chapter is an extension of Chap. 2 to a system with symmetry and a prerequisite to the study of structures and materials with dihedral symmetry in Chaps. 913 and larger symmetries in Chaps. 1417.

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Notes

  1. 1.

    See, for example, Sattinger, 1979 [167], 1980 [168]; Golubitsky and Schaeffer, 1985 [55]; and Golubitsky, Stewart, and Schaeffer, 1988 [57].

  2. 2.

    See, for example, Olver, 1986 [151], 1995 [152]; Mitropolsky and Lopatin, 1988 [133]; Allgower, Böhmer, and Golubitsky, 1992 [1]; Marsden and Ratiu, 1994 [128]; and Hoyle, 2006 [69].

  3. 3.

    Loosely speaking, the term “generically” might be replaced by “unless the parameters take special values.”

  4. 4.

    Reciprocity plays a significant role in the bifurcation analysis of Cn-symmetric systems (cf., Sect. 9.9).

  5. 5.

    Since P is the projection on an M-dimensional subspace, Eq. (8.36) represents M constraints and (8.37) represents (N − M) constraints.

  6. 6.

    Since T is assumed to be unitary, U and V  in (8.45) are valid choices (cf., Remark 8.4).

  7. 7.

    We can replace T(g)w by w since w is arbitrary in \(\mathrm {ker} (J^{0}_{\mathrm {c}} )\) and \(\mathrm {ker} (J^{0}_{\mathrm {c}} )\) is G-invariant. We can also replace S(g)v by v since v is arbitrary.

  8. 8.

    The uniqueness assertion applies since \( T(g) \boldsymbol {\varphi } ( T(g^{-1})\boldsymbol {w}, \tilde {f}, S(g^{-1})\boldsymbol {v}) \in U\) by the G-invariance of U and S(g −1)v stays in a neighborhood of v 0 by ∥S(g −1)v −v 0∥ = ∥S(g −1)(v −v 0)∥ = ∥v −v 0∥. Here the first equality holds by (8.32) and the second equality by the unitarity of S.

  9. 9.

    For a block matrix \(\overline {J}\) as in (8.56), the matrix \(\overline {J}_{[1,1]} - \overline {J}_{[1,2]} (\overline {J}_{[2,2]})^{-1} \overline {J}_{[2,1]} \) is called the Schur complement .

  10. 10.

    This is true for a certain type of double bifurcation point of a Dn-symmetric system (cf., (9.60) with \(\hat {n}\ge 4\)).

  11. 11.

    Equation (8.82) corresponds to the bifurcation equation (8.26) for the perfect system with v = v 0, where the imperfection parameter vector v is suppressed.

  12. 12.

    See Lemma 7.1(iii) (Schur’s lemma) in Sect. 7.3.4.

  13. 13.

    This counterclockwise rotation appears to be clockwise in Fig. 8.2 since the z-axis is directed downward.

  14. 14.

    In Sect. 9.2.2 we introduce a more systematic notation: \(\mu _{1} = (+,+)_{\mathrm {D}_{3}}\), \(\mu _{2} = (+,-)_{\mathrm {D}_{3}}\), and \(\mu _{3} = (1)_{\mathrm {D}_{3}}\). Every μ i is absolutely irreducible, therefore, R a(D3) = R(D3).

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Ikeda, K., Murota, K. (2019). Group-Theoretic Bifurcation Theory. In: Imperfect Bifurcation in Structures and Materials. Applied Mathematical Sciences, vol 149. Springer, Cham. https://doi.org/10.1007/978-3-030-21473-9_8

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