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Abstract Data Type as a Mathematical entity
 | a set of mathematical structures with a set of well defined operations; |
| each structure has a "state" or "value" |
| some operations (manipulation procedures) cause the ADT to change state |
| other operations (access functions) return information without changing the state |
Examples with a stack:
| sets of structures |
| manipulation procedures : pop and push |
| access functions: isempty, topof |