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1: 36.4 Bifurcation Sets
§36.4 Bifurcation Sets
… ►Bifurcation (Catastrophe) Set for Cuspoids
… ►Bifurcation (Catastrophe) Set for Umbilics
… ► , fold bifurcation set: … ►§36.4(ii) Visualizations
…2: 36.5 Stokes Sets
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►The Stokes set is itself a cusped curve, connected to the cusp of the bifurcation set:
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►They generate a pair of cusp-edged sheets connected to the cusped sheets of the swallowtail bifurcation set (§36.4).
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►This consists of a cusp-edged sheet connected to the cusp-edged sheet of the bifurcation set and intersecting the smooth sheet of the bifurcation set.
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►In Figures 36.5.1–36.5.6 the plane is divided into regions by the dashed curves (Stokes sets) and the continuous curves (bifurcation sets).
…In Figure 36.5.4 the part of the Stokes surface inside the bifurcation set connects two complex saddles.
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3: 36.15 Methods of Computation
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►Far from the bifurcation set, the leading-order asymptotic formulas of §36.11 reproduce accurately the form of the function, including the geometry of the zeros described in §36.7.
Close to the bifurcation set but far from , the uniform asymptotic approximations of §36.12 can be used.
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4: 36.14 Other Physical Applications
5: 36.7 Zeros
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►Inside the cusp, that is, for , the zeros form pairs lying in curved rows.
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►Deep inside the bifurcation set, that is, inside the three-cusped astroid (36.4.10) and close to the part of the -axis that is far from the origin, the zero contours form an array of rings close to the planes
…The rings are almost circular (radii close to and varying by less than 1%), and almost flat (deviating from the planes by at most ).
…Outside the bifurcation set (36.4.10), each rib is flanked by a series of zero lines in the form of curly “antelope horns” related to the “outside” zeros (36.7.2) of the cusp canonical integral.
There are also three sets of zero lines in the plane related by rotation; these are zeros of (36.2.20), whose asymptotic form in polar coordinates is given by
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6: 29.19 Physical Applications
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►Brack et al. (2001) shows that Lamé functions occur at bifurcations in chaotic Hamiltonian systems.
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7: 36.11 Leading-Order Asymptotics
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►and far from the bifurcation set, the cuspoid canonical integrals are approximated by
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36.11.3
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36.11.4
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36.11.5
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36.11.6
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8: Bibliography B
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Pionic atoms.
Annual Review of Nuclear and Particle Science 20, pp. 467–508.
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A program for computing the Riemann zeta function for complex argument.
Comput. Phys. Comm. 20 (3), pp. 441–445.
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Coulomb functions (negative energies).
Comput. Phys. Comm. 20 (3), pp. 447–458.
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Some solutions of the problem of forced convection.
Philos. Mag. Series 7 20, pp. 322–343.
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Occurrence of periodic Lamé functions at bifurcations in chaotic Hamiltonian systems.
J. Phys. A 34 (40), pp. 8199–8220.
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9: 20 Theta Functions
Chapter 20 Theta Functions
…10: William P. Reinhardt
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►Reinhardt firmly believes that the Mandelbrot set is a special function, and notes with interest that the natural boundaries of analyticity of many “more normal” special functions are also fractals.
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►In November 2015, Reinhardt was named Senior Associate Editor of the DLMF and Associate Editor for Chapters 20, 22, and 23.