A `zero-eigenvalue bifurcation` [http://identifiers.org/teddy/TEDDY_0000123] in which a stable [http://identifiers.org/teddy/TEDDY_0000133] fixed point [http://identifiers.org/teddy/TEDDY_0000086] and an unstable [not TEDDY_0000133] fixed point [http://identifiers.org/teddy/TEDDY_0000086] coalesce and exchange their stability.
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