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Fox (code word) Fox is a brevity code used by NATO pilots to signal the simulated or actual release of an air-to-air munition or other combat function. Army aviation elements may use a different nomenclature, as the nature of helicopter -fired weapons is almost always air-to-surface. "Fox" is short for "foxtrot", the NATO phonetic designation ...
Typographical symbols and punctuation marks are marks and symbols used in typography with a variety of purposes such as to help with legibility and accessibility, or to identify special cases. This list gives those most commonly encountered with Latin script. For a far more comprehensive list of symbols and signs, see List of Unicode characters.
A proof by double counting. A combinatorial identity is proven by counting the number of elements of some carefully chosen set in two different ways to obtain the different expressions in the identity. Since those expressions count the same objects, they must be equal to each other and thus the identity is established. A bijective proof.
Lithium-ion polymer battery (LiPo) Lithium–iron–phosphate battery (LFP) Lithium–nickel–manganese–cobalt oxides (NMC) Lithium–nickel–cobalt–aluminium oxides (NCA) Lithium–sulfur battery. Lithium–titanate battery (LTO) Thin-film lithium-ion battery. Lithium–ceramic battery [2][3] Rechargeable lithium–metal battery.
The Thiele Modulus was developed to describe the relationship between diffusion and reaction rates in porous catalyst pellets with no mass transfer limitations. This value is generally used to measure the effectiveness factor of pellets. The Thiele modulus is represented by different symbols in different texts, but is defined in Hill [2] as hT.
The Jordan–Wigner transformation is a transformation that maps spin operators onto fermionic creation and annihilation operators. It was proposed by Pascual Jordan and Eugene Wigner [1] for one-dimensional lattice models, but now two-dimensional analogues of the transformation have also been created. The Jordan–Wigner transformation is ...
by the change of variables: in these steps: Replace by and apply the chain rule to get. Replace and by and to get. Replace and by and and divide both sides by to get. Replace by and divide through by to yield the heat equation. Advice on the application of change of variable to PDEs is given by mathematician J. Michael Steele: [1]
The precise origins of the dimensions of US letter-size paper (8.5 × 11 in) are not known. The American Forest & Paper Association says that the standard US dimensions have their origin in the days of manual papermaking, the 11-inch length of the standard paper being about a quarter of "the average maximum stretch of an experienced vatman's arms". [2]