Size zero Size zero Size zero or size 0 is a women's clothing size in the US catalog sizes system. Size 0 and 00 were invented due to the changing of clothing sizes over time (referred to as vanity sizing or size inflation), which has caused the adoption of lower numbers. For example, a 2011 size 0 is equivalent to a 2001 size 2, and is larger than a 1970 size 6 or 1958 size 8. Modern size 0 clothing, depending on brand and style, fits measurements of chest-stomach-hips from 30-22-32 inches (76-56-81 cm) to 36-28-36 inches (90-71½-90 cm). Size 00 can
Size consistency and size extensivity (to any order), and full configuration interaction (CI) are size extensive but not always size consistent. For example, the Restricted Hartree–Fock model is not able to describe correctly the dissociation curves of H and therefore all post HF methods will fail in that matter (except FCI). Sometimes numerical errors can cause a method that is formally size-consistent to behave in a non-size-consistent manner. Core-extensivity is yet another related property, which extends the requirement to the proper treatment of excited states. Size consistency and size extensivity In quantum chemistry, size consistency and size extensivity are concepts relating to how the behaviour