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1. A set of interrelated elements separated from the environment (adapted from DIN IEC 60050-351)
, 2. Note: A system is characterised by:
, 2.1. the definition of a borders to the environment (system borders), with which it can exchange material, energy and information via interfaces (system input and output).
, 2.2. its elements which, when the resolution is increased, represent systems themselves (subsystems) or which are regarded as not being decomposable any further (system elements).
, 2.3. the sequence structure in the elements which is characterised by specific rules and constant or variable attributes.
, 2.4. the relations which connect the system elements among each other (composition structure) so that a process can be run.
, 2.5. the states of the elements which are each described by stating the values of all constant and variable attributes (state variable) of which generally only a small part is relevant to the investigation.
, 2.6. the state transitions of the elements as continuous or discrete changes of at least one state variable due to the process running in the system.
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