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- этимология
Что (кто) такое null sequence - определение
NULL SEQUENCE; VALUE THAT THE TERMS OF A SEQUENCE "TEND TO"
Convergent sequence; Null sequences; Topological convergence; Divergent sequence; Null sequence; Limit of a sequence (topology); Limit point of a sequence
![The sequence given by the perimeters of regular ''n''-sided [[polygon]]s that circumscribe the [[unit circle]] has a limit equal to the perimeter of the circle, i.e. <math>2\pi r</math>. The corresponding sequence for inscribed polygons has the same limit.](https://commons.wikimedia.org/wiki/Special:FilePath/Archimedes pi.svg?width=200 "The sequence given by the perimeters of regular ''n''-sided [[polygon]]s that circumscribe the [[unit circle]] has a limit equal to the perimeter of the circle, i.e. <math>2\pi r</math>. The corresponding sequence for inscribed polygons has the same limit.")
![The plot of a Cauchy sequence (''x<sub>n</sub>''), shown in blue, as <math>x_n</math> versus ''n''. Visually, we see that the sequence appears to be converging to a limit point as the terms in the sequence become closer together as ''n'' increases. In the [[real numbers]] every Cauchy sequence converges to some limit.](https://commons.wikimedia.org/wiki/Special:FilePath/Cauchy sequence illustration.svg?width=200 "The plot of a Cauchy sequence (''x<sub>n</sub>''), shown in blue, as <math>x_n</math> versus ''n''. Visually, we see that the sequence appears to be converging to a limit point as the terms in the sequence become closer together as ''n'' increases. In the [[real numbers]] every Cauchy sequence converges to some limit.")
Limit of a sequence
As the positive integer n becomes larger and larger, the value n\cdot \sin\left(\tfrac1{n}\right) becomes arbitrarily close to 1. We say that "the limit of the sequence n\cdot \sin\left(\tfrac1{n}\right) equals 1.
Null allele
NONFUNCTIONAL ALLELE (A VARIANT OF A GENE) CAUSED BY A GENETIC MUTATION
Null mutation; Null Allele; Null alleles; Null mutant
A null allele is a nonfunctional allele (a variant of a gene) caused by a genetic mutation. Such mutations can cause a complete lack of production of the associated gene product or a product that does not function properly; in either case, the allele may be considered nonfunctional.
Null (SQL)
![omega (ω)]] character is used to represent Null in [[database theory]].](https://commons.wikimedia.org/wiki/Special:FilePath/Db null.png?width=200 "omega (ω)]] character is used to represent Null in [[database theory]].")
![outer join]] query with Null placeholders in the result set. The Null markers are represented by the word <code>NULL</code> in place of data in the results. Results are from [[Microsoft SQL Server]], as shown in SQL Server Management Studio.](https://commons.wikimedia.org/wiki/Special:FilePath/Sql query1.png?width=200 "outer join]] query with Null placeholders in the result set. The Null markers are represented by the word <code>NULL</code> in place of data in the results. Results are from [[Microsoft SQL Server]], as shown in SQL Server Management Studio.")
SPECIAL MARKER AND KEYWORD IN SQL INDICATING THAT SOMETHING HAS NO VALUE
Sql null; NULL (SQL); NVL; NULLIF; SQL CASE; Sql case; Codd tables; Codd table; COALESCE; C-table; Uncertain database; NULL marks; Null (database)
In SQL, null or NULL is a special marker used to indicate that a data value does not exist in the database. Introduced by the creator of the relational database model, E.
Википедия
Limit of a sequence
In mathematics, the limit of a sequence is the value that the terms of a sequence "tend to", and is often denoted using the symbol (e.g., ). If such a limit exists, the sequence is called convergent. A sequence that does not converge is said to be divergent. The limit of a sequence is said to be the fundamental notion on which the whole of mathematical analysis ultimately rests.
Limits can be defined in any metric or topological space, but are usually first encountered in the real numbers.
