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A Ponzi scheme claims to rely on some esoteric investment approach, and often attracts well-to-do investors, whereas pyramid schemes explicitly claim that new money will be the source of payout for the initial investments. [2] A pyramid scheme typically collapses much faster because it requires exponential increases in participants to sustain it.
Classification scheme (information science), eg a thesaurus, a taxonomy, a data model or an ontology; Scheme (mathematics), a concept in algebraic geometry; Scheme (rhetoric), a figure of speech that changes a sentence's structure; Scam, an attempt to swindle or cheat people through deception; Scheme, a type of government program in India
Scheme specifies a comparatively full set of numerical datatypes including complex and rational types, which is known in Scheme as the numerical tower (R5RS sec. 6.2 [4]). The standard treats these as abstractions, and does not commit the implementor to any particular internal representations. Numbers may have the quality of exactness.
In information science and ontology, a classification scheme is an arrangement of classes or groups of classes. The activity of developing the schemes bears similarity to taxonomy, but with perhaps a more theoretical bent, as a single classification scheme can be applied over a wide semantic spectrum while taxonomies tend to be devoted to a single topic.
The formal definition of a database schema is a set of formulas (sentences) called integrity constraints imposed on a database. [citation needed] These integrity constraints ensure compatibility between parts of the schema. All constraints are expressible in the same language.
A rhyme scheme is the pattern of rhymes at the end of each line of a poem or song. It is usually referred to by using letters to indicate which lines rhyme; lines designated with the same letter all rhyme with each other. An example of the ABAB rhyming scheme, from "To Anthea, who may Command him Anything", by Robert Herrick:
Well, it does. But it’s not the only consideration. Say you’re 67 years old, with $1.5 million in retirement savings, including your 401(k), investment retirement account (IRA) and other ...
Ponzi schemes typically come with the expectation of profit over a relatively extended period and typically last for months, years or even decades before their inevitable collapse. By comparison, pump-and-dump scams are designed to make profits extremely quickly and are executed over weeks, days or even hours.