The number of possible subsets of a power set originating from a set with X number of element is given by the expression ____

The number of possible subsets of a power set originating from a set with X number of element is given by the expression ____ Correct Answer 22x-2

The number of possible subsets of a power set originating from a set with X number of element is given by the expression 22x-2. This expressed is referred as double exponential. It is not possible for all candidate topologies to be closed under union and finite intersection. It is necessary to define finite interface topologies more compactly.

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In the generation of element geometries, if dx dy represents an area element in the real element and dεdη represents the corresponding area element in the master element, then what is the expression for Jacobian je?