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Strogatz, Steven. "Nonlinear
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Nonlinear
Oscillations, Dynamical Systems, and Bifurcations of Vector Fields
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321:{\displaystyle {\frac {\mathrm {d} u}{\mathrm {d} t}}=\mu u-u^{2}+O(u^{3})}
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to the normal form of the bifurcation. For example, the normal form of a
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Normal Forms and
Unfoldings for Local Dynamical Systems
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18:Normal form (bifurcation theory)
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374:{\displaystyle u=x-1,\mu =r+1}
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