A maximum or minimum value of a function.
The heaters are used in enclosures where condensation is to be prevented or the temperature may not fall below a minimum value.
The feature is the root node of the minimum value (or most), and the root node tree is also a heap of two sons.
The load of the main diesel generating system on a degaussing ship is impulsive, which rise to the maximum value and drop to the minimum value in very short time, and its ranges are degressive.
In most cases there is a minimum value (often zero) and a maximum value; if so, make sure the number is inside its legal range.
Note : The maintained illuminance is the minimum value to which the illuminance is allowed to fall.