A `bifurcation` [http://identifiers.org/teddy/TEDDY_0000053] in which a stable [http://identifiers.org/teddy/TEDDY_0000133] fixed point [http://identifiers.org/teddy/TEDDY_0000086] changes to an unstable [not TEDDY_0000133] one or vanishes. It can be detected within any small neighborhood of the fixed point: the real part of the eigenvalue of the linarisation around the fixed point is zero at the bifurcation.