A `Hopf bifurcation` [http://identifiers.org/teddy/TEDDY_0000072] in which neigther a limit cycle [http://identifiers.org/teddy/TEDDY_0000051] is destroyed nor a limit cycle [http://identifiers.org/teddy/TEDDY_0000051] appears. On the bifurcation the fixed point [http://identifiers.org/teddy/TEDDY_0000086] is a `center` [http://identifiers.org/teddy/TEDDY_0000088].
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