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Greek letters are used in mathematics, science, engineering, and other areas where mathematical notation is used as symbols for constants, special functions, and also conventionally for variables representing certain quantities. In these contexts, the capital letters and the small letters represent distinct and unrelated entities.
The term differential is used nonrigorously in calculus to refer to an infinitesimal ("infinitely small") change in some varying quantity. For example, if x is a variable, then a change in the value of x is often denoted Δ x (pronounced delta x ). The differential dx represents an infinitely small change in the variable x.
Lung compliance. In general, compliance is defined by the change in volume (Δ V) versus the associated change in pressure (Δ P ), or Δ V /Δ P : During mechanical ventilation, compliance is influenced by three main physiologic factors: Lung compliance is influenced by a variety of primary abnormalities of lung parenchyma, both chronic and acute.
Exothermic reaction. The reaction is famously exothermic. The reduction of iron (III) oxide by releases sufficient heat to yield molten iron. In thermochemistry, an exothermic reaction is a "reaction for which the overall standard enthalpy change Δ H ⚬ is negative." [1] [2] Exothermic reactions usually release heat.
Delta model (after the Greek letter Delta, standing for transformation and change) is a customer-based approach to strategic management. [1] [2] [3] Compared to a philosophical focus on the characteristics of a product (product economics), the model is based on consumer economics. The aim is to create a very strong bond between the company and ...
The Nile Delta at night as seen from the ISS in October 2010. The Nile Delta ( Arabic: دلتا النيل, Delta an-Nīl or simply الدلتا, ad-Delta) is the delta formed in Lower Egypt where the Nile River spreads out and drains into the Mediterranean Sea. [1] It is one of the world's larger deltas—from Alexandria in the west to Port ...
Delta operator. In mathematics, a delta operator is a shift-equivariant linear operator on the vector space of polynomials in a variable over a field that reduces degrees by one. To say that is shift-equivariant means that if , then. In other words, if is a "shift" of , then is also a shift of , and has the same "shifting vector" .
Delta encoding is a way of storing or transmitting data in the form of differences (deltas) between sequential data rather than complete files; more generally this is known as data differencing. Delta encoding is sometimes called delta compression, particularly where archival histories of changes are required (e.g., in revision control software ).