Null (mathematics)

In mathematics, the word null (from German: null meaning "zero", which is from Latin: nullus meaning "none") means of or related to having zero members in a set or a value of zero. Sometimes the symbol ∅ is used to distinguish "null" from 0. is sometimes called Aleph null.

In a normed vector space the null vector is the zero vector; in a seminormed vector space such as Minkowski space, null vectors are, in general, non-zero. In set theory, the null set is the set with zero elements; and in measure theory, a null set is a set with zero measure.

A null space of a mapping is the part of the domain that is mapped into the null element of the image (the inverse image of the null element).

In statistics, a null hypothesis is a proposition presumed true unless statistical evidence indicates otherwise.

References

Null character

The null character (also null terminator), abbreviated NUL, is a control character with the value zero. It is present in many character sets, including ISO/IEC 646 (or ASCII), the C0 control code, the Universal Character Set (or Unicode), and EBCDIC. It is available in nearly all mainstream programming languages.

The original meaning of this character was like NOP—when sent to a printer or a terminal, it does nothing (some terminals, however, incorrectly display it as space). When electromechanical teleprinters were used as computer output devices, one or more null characters were sent at the end of each printed line to allow time for the mechanism to return to the first printing position on the next line. On punched tape, the character is represented with no holes at all, so a new unpunched tape is initially filled with null characters, and often text could be "inserted" at a reserved space of null characters by punching the new characters into the tape over the nulls.

Today the character has much more significance in C and its derivatives and in many data formats, where it serves as a reserved character used to signify the end of a string, often called a null-terminated string. This allows the string to be any length with only the overhead of one byte; the alternative of storing a count requires either a string length limit of 255 or an overhead of more than one byte (there are other advantages/disadvantages described under null-terminated string).

Goblin

A goblin is a legendary evil or mischievous grotesque dwarf-like daemon or monster that appeared in European stories and accounts during the Middle Ages. They are ascribed various (sometimes conflicting) abilities, temperaments and appearances depending on the story and country of origin. In some cases, goblins are little creatures related to the brownie and gnome. They are usually small, sometimes only a few inches tall, sometimes the size of a dwarf, and have magical abilities; they are greedy, especially for gold and jewelry.

Name

Alternative spellings include gobblin, gobeline, gobling, goblyn, and gobbelin.

English goblin is first recorded in the 14th century and is probably from unattested Anglo-Norman *gobelin, similar to Old French gobelin, already attested around 1195 in Ambroise of Normandy's Guerre sainte, and to Medieval Latin gobelinus in Orderic Vitalis before 1141, which was the name of a devil or a daemon haunting the country around Évreux, Normandy.

It may be related both to German kobold and to Medieval Latin cabalus, or *gobalus, itself from Greek κόβαλος (kobalos), "rogue", "knave", "imp", "goblin". Alternatively, it may be a diminutive or other derivative of the French proper name Gobel, more often Gobeau, diminutive forms Gobelet, Goblin, Goblot, but their signification is probably "somebody who sells timblers or beakers or cups". Moreover, these proper names are not from Normandy, where the word gobelin, gobelinus first appears in the old documents. German Kobold contains the Germanic root kov- (Middle German Kobe "refuge, cavity", "hollow in a rock", Dial. English cove "hollow in a rock", English "sheltered recess on a coast", Old Norse kofi "hut, shed" ) which means originally a "hollow in the earth". The word is probably related to Dial. Norman gobe "hollow in a cliff", with simple suffix -lin or double suffixation -el-in (cf. Norman surnames Beuzelin,Gosselin,Étancelin, etc.)

Fairy (Artemis Fowl)

Fairies, in the fantasy series Artemis Fowl by Eoin Colfer, are fictional beings, usually shorter than a human, who possess magic properties. The average height of a fairy is exactly 1 metre, one centimetre. All the fairies have retreated below the Earth to escape the destructiveness of the human race. Their underground civilization is centered on the capital city of Haven. Fairies are vernacularly known as the People, and live a life according to the Book of the People. There are 8 recognized families of fairies- Elves, Dwarves, Pixies, Gnomes, Gremlins, Goblins, Sprites and Demons. However, the centaurs have been mentioned several times, as with trolls, and the centaurs' cousins, the unicorns, were killed off, yet they are not recognized.

Races of Fairies and the eight families

The Eight Families

In Artemis Fowl and the Lost Colony, it is said that 10,000 years ago, there were eight families (or species) of fairies. It is possible that Centaurs and Trolls used to live not underground but above ground, and were recruited by the fairies for the war against the Mud People (the term used by fairies to address humans). This would explain the links between many animals these two species have, and would explain why they don't have magic. Centaurs are also cousins of unicorns, so they couldn't be in the fairy family without the unicorns. The fairies, however, are mostly humanoid. Warlocks are also part of the fairy world. They are extremely magical fairies that originate under unknown circumstances.

Goblin (disambiguation)

A goblin is a legendary creature, related to gnomes or elves.

Goblin may also refer to:

Fictional goblins

Notable fictional examples include:

In the arts

Device file

In Unix-like operating systems, a device file or special file is an interface for a device driver that appears in a file system as if it were an ordinary file. There are also special files in MS-DOS, OS/2, and Microsoft Windows. They allow software to interact with a device driver using standard input/output system calls, which simplifies many tasks and unifies user-space I/O mechanisms.

Device files often provide simple interfaces to peripheral devices, such as printers and serial ports. But they can also be used to access specific resources on those devices, such as disk partitions. Finally, device files are useful for accessing system resources that have no connection with any actual device such as data sinks and random number generators.

MS-DOS borrowed the concept of special files from Unix, but renamed them devices. Because early versions of MS-DOS did not support a directory hierarchy, devices were distinguished from regular files by making their names reserved words. This means that certain file names were reserved for devices, and should not be used to name new files or directories. The reserved names themselves were chosen to be compatible with "special files" handling of PIP command in CP/M. There were two kinds of devices in MS-DOS: Block Devices (used for disk drives) and Character Devices (generally all other devices, including COM and PRN devices). PIPE, MAILSLOT, and MUP are other standard Windows devices.

Dev (film)

Dev (Hindi: देव) is a 2004 Hindi drama film, directed by Govind Nihalani. The film won the Filmfare Critics Award for Best Movie, and Kareena Kapoor won the Filmfare Critics Award for Best Actress for her performance.

Plot

Joint Commissioner of Police Dev Pratap Singh, a duty-bound, self-righteous officer, and Special Commissioner Tejinder Khosla, the balancing force between the political interests of Chief Minister Bhandarker and Dev's commitment to the law, are lifelong friends, each with his own ideals. Farhaan, a law graduate, was brought up with ideals of non-violence and patriotism. Dev unwittingly gives Farhaan the wound that plunges him into rage and violence after witnessing the death of his father during a peace demonstration. Taking advantage of the situation, corrupt politician Latif sets the vulnerable young man on a path of violence and destruction that threatens to ignite the city. Aaliya is the light in Farhaan's life. Beautiful and innocent, the young woman also gets caught in extraordinary circumstances that transform her life and she dares to stand up for the truth. Dev is the saga of Dev and Tej's friendship, a bond stronger than blood ties in which Farhaan emerges as the wedge driving them apart. The story unfolds against the vitiated atmosphere of present times where innocent lives become fodder for political expediency. The spark of terrorist violence unknowingly set off by Farhaan under the aegis of the corrupt politician Latif engulfs the whole city in its flames. Tej transgresses beyond the boundaries of law in his passion to eliminate anti-national crime. Dev is faced with the spectre of the tragic human cost and a moral compulsion to act. The stakes rise beyond self-interest. Dev and Tej are set on a path of dramatic collision. Even as Dev and Farhaan's fate gets irreversibly linked, two soldiers whose allegiance may be to different causes but admiration for each other's courage and integrity brings them together.