Is Every System Not in Contact with a Temperature Source Considered Isolated?

hokhani
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As we know the microcanonical ensemble is concerned with the isolated system.
What is the definition of isolated system here? Can we call here each system which only is not in contact with any source of temeperature (No matter how much work is done) an isolated system?
 
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To be described by the microcanonical ensemble, a system must have a fixed number of particles N, a fixed volume V and a fixed energy E.
 

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