A `pitchfork bifurcation` [http://identifiers.org/teddy/TEDDY_0000122] in which two symmetrical stable [http://identifiers.org/teddy/TEDDY_0000133] fixed points [http://identifiers.org/teddy/TEDDY_0000086] and an unstable [not TEDDY_0000133] fixed point [http://identifiers.org/teddy/TEDDY_0000086] appear from a stable fixed point.
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