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. 9–13 and larger symmetries in Chaps. 14–17.
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Notes
- 1.
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- 3.
Loosely speaking, the term “generically” might be replaced by “unless the parameters take special values.”
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Reciprocity plays a significant role in the bifurcation analysis of Cn-symmetric systems (cf., Sect. 9.9).
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- 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.
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.
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.
This is true for a certain type of double bifurcation point of a Dn-symmetric system (cf., (9.60) with \(\hat {n}\ge 4\)).
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This counterclockwise rotation appears to be clockwise in Fig. 8.2 since the z-axis is directed downward.
- 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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