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- Mathematical theory developed by Rene Thom in
- 1972, in which he showed that the growth of
- an organism proceeds by a series of gradual
- changes that are triggered by, and in turn
- trigger, large-scale changes or
- `catastrophic' jumps. It also has
- applications in engineering - for example,
- the gradual strain on the structure of a
- bridge that can eventually result in a sudden
- collapse - and has been extended to economic
- and psychological events.
-