Some refrigerators must be within certain external temperature parameters to run properly.
2.
Then changing the system's temperature parameter by d \ beta and the external variable by dx will lead to a change in \ log Z:
3.
Where the action value q _ t ( a ) corresponds to the expected reward of following action a and \ tau is called a temperature parameter ( in allusion to statistical mechanics ).
4.
Talking about " quantum " phase transitions means talking about transitions at " T " = 0 : by tuning a non-temperature parameter like pressure, chemical composition or magnetic field, one could suppress e . g . some transition temperature like the Curie-or N�el-temperature to 0 K.
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