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| a minus sign; a quantity less than zero |
| a statement that two quantities are equal; an equation |
| catastrophe theory | |
| —n | |
| a. a mathematical theory that classifies surfaces according to their form | |
| b. the popular application of this theory to the explanation of abruptly changing phenomena, as by the discontinuity of a line on the topmost fold of a folded surface | |
| Main Entry: | catastrophe theory |
| Part of Speech: | n |
| Definition: | a branch of mathematics that deals with systems which have major abrupt changes, esp. using topology to explain events |