Kolkata is going to add a new feather to its cap. It has come to the knowledge that Kolkata, the first city in the country to have a metro railway network, is also going to have the first and foremost underwater rail connection in the country. This was cleared by the Union Cabinet in the recent days and is associated with the ..
- In metaphysics, extension is the property of taking up space; see extension (metaphysics).
- For a related concept in physics, see extensive quantity.
- In semantics (with applications to both philosophy and mathematics), extension is the set of things to which a property applies; see extension (semantics).
- In dentistry, enamel extension.
- In general semantics, extension is a process that, as in this mathematical example, starts with unique individuals, and gives them unique names, e.g., I, II, III, etc., or 1, 2, 3, etc. The next step if needed generalizes or passes beyond extension to infinite-valued higher-order abstractions like 'numbers', and so on. The passing from lower-order abstractions (presented extensionally) to higher orders, e.g., from '1, 2, 3, etc.,' to 'numbers,' is said to follow the 'natural order of evaluation,' so that when one talks about order, extension is implied, and when one talks about extension, order is implied. An example of reversed order is when a particular higher-order abstraction such as race, e.g., 'white', 'black' etc., is projected onto the individuals comprising it. The individuals (each uniquely different by extension, no matter what is being discussed) comprise the 'race' (which exists only on higher-orders), not the other way around. This usage derives from extension (semantics). See extensional devices.
- In mathematics, an extension of some structure is another structure which contains the original structure.
- For a list of at least 30 mathematics articles containing the word "extension" in the title, see extension (mathematics), a disambiguation page.
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