unstable equilibrium


From The Collaborative International Dictionary of English v.0.48:

Unstable \Un*sta"ble\, a. [Cf. Instable.]
   Not stable; not firm, fixed, or constant; subject to change
   or overthrow. -- Un*sta"ble*ness, n. --Chaucer.
   [1913 Webster]

   Unstable equilibrium. See Stable equilibrium, under
      Stable.
      [1913 Webster]
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