null divisor - ορισμός. Τι είναι το null divisor
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Τι (ποιος) είναι null divisor - ορισμός

Dirichlet divisor problem; Divisor problem; Dirichlet's divisor problem
  • The summatory function, with leading terms removed, for <math>x < 10^7</math>, graphed as a distribution or histogram. The vertical scale is not constant left to right; click on image for a detailed description.
  • The summatory function, with leading terms removed, for <math>x < 10^7</math>
  • The summatory function, with leading terms removed, for <math>x < 10^4</math>

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]].
  • 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.
/dev/null         
SPECIAL COMPUTER FILE THAT DISCARDS ALL WRITES
Dev/null; /dev/null/; NUL:; The null device; NUL (computer); NUL (Computer); Dev-null; \Device\Null; /dev/null; Unix null device; \DEV\NUL; /DEV/NUL; NIL:; $null; DD DUMMY; VMS NL:; NUL (device)
/dev-nuhl/ [The Unix null device, used as a data sink] A notional "black hole" in any information space being discussed, used, or referred to. A controversial posting, for example, might end "Kudos to rasputin@kremlin.org, flames to /dev/null". See bit bucket. [Jargon File]

Βικιπαίδεια

Divisor summatory function

In number theory, the divisor summatory function is a function that is a sum over the divisor function. It frequently occurs in the study of the asymptotic behaviour of the Riemann zeta function. The various studies of the behaviour of the divisor function are sometimes called divisor problems.