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In quantum chemistry, size consistency and size extensivity are concepts relating to how the behaviour of quantum-chemistry calculations changes with the system size. Size consistency (or strict separability) is a property that guarantees the consistency of the energy behaviour when interaction between the involved molecular subsystems is nullified (for example, by distance).
An extensive property is a physical quantity whose value is proportional to the size of the system it describes, [8] or to the quantity of matter in the system. For example, the mass of a sample is an extensive quantity; it depends on the amount of substance.
The problem of deciding whether a state is separable in general is sometimes called the separability problem in quantum information theory. It is considered to be a difficult problem. It has been shown to be NP-hard in many cases [2] [3] and is believed to be so in general. Some appreciation for this difficulty can be obtained if one attempts ...
An -particle system is -producible if it is a mixture of states such that each of them is separable with respect to some partition {, …,}, where the size of is at most . [2] [1] If a state is not k-producible then it is at least (+)-particle entangled.
The officials, Russell Hott and Peter Berg, were recently cut from ICE's enforcement division amid increasing pressure from the Trump administration to ramp up the number of illegal migrant ...
Any topological space that is itself finite or countably infinite is separable, for the whole space is a countable dense subset of itself. An important example of an uncountable separable space is the real line, in which the rational numbers form a countable dense subset.
How much water you need depends on your activity level, body size, sex, health status and environment. Generally speaking, women need 91 ounces and men need 125 ounces of fluids daily.
Sometimes, a little kindness can change a life. Alix Earle recently shared an uplifting video of her foster dog, Asia, happily embracing the breeze during a car ride. The pup had spent 495 days at ...