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The phantom reference is one of the strengths or levels of 'non strong' reference defined in the Java programming language; the others being weak and soft. [1] Phantom reference are the weakest level of reference in Java; in order from strongest to weakest, they are: strong, soft, weak, phantom.
States marked 'TC' are widely considered technologically capable of wielding, operating or developing nuclear weapons, however are signatories of the Nuclear Non-Proliferation Treaty (NPT) and are not known to possess any at the current moment.
2,6-Di-tert-butylpyridine, a weak non-nucleophilic base [2] pK a = 3.58; Phosphazene bases, such as t-Bu-P 4 [3] Non-nucleophilic bases of high strength are usually anions. For these species, the pK a s of the conjugate acids are around 35–40. Lithium diisopropylamide (LDA), pK a = 36
(Warning: the weak Banach space topology and the weak operator topology and the ultraweak topology are all sometimes called the weak topology, but they are different.) The strong-* operator topology or strong-* topology is defined by the seminorms ||x(h)|| and ||x * (h)|| for h ∈ H. It is stronger than the strong and weak operator topologies.
All possible polar topologies on a dual pair are finer than the weak topology and coarser than the strong topology. The complex vector space C n may be equipped with either its usual (Euclidean) topology, or its Zariski topology. In the latter, a subset V of C n is closed if and only if it consists of all solutions to some system of polynomial ...
In order from strongest to weakest, they are: strong, soft, weak, phantom. Soft references behave almost identically to weak references. Soft and weak references provide two quasi-priorities for non-strongly referenced objects: the garbage collector will always collect weakly referenced objects, but will only collect softly referenced objects ...
The higher the proton affinity, the stronger the base and the weaker the conjugate acid in the gas phase.The (reportedly) strongest known base is the ortho-diethynylbenzene dianion (E pa = 1843 kJ/mol), [3] followed by the methanide anion (E pa = 1743 kJ/mol) and the hydride ion (E pa = 1675 kJ/mol), [4] making methane the weakest proton acid [5] in the gas phase, followed by dihydrogen.
Caubère defines superbases as "bases resulting from a mixing of two (or more) bases leading to new basic species possessing inherent new properties. The term superbase does not mean a base is thermodynamically and/or kinetically stronger than another, instead it means that a basic reagent is created by combining the characteristics of several ...