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The latter two symbols were introduced by the Bourbaki group (specifically André Weil) in 1939, inspired by the letter Ø in the Danish and Norwegian alphabets (and not related in any way to the Greek letter Φ). [2] Empty sets are used in set operations. For example: = {,,,,} = {,,,}
In SQL, wildcard characters can be used in LIKE expressions; the percent sign % matches zero or more characters, and underscore _ a single character. Transact-SQL also supports square brackets ([and ]) to list sets and ranges of characters to match, a leading caret ^ negates the set and matches only a character not within the list.
Null symbol may refer to: Null character , U+0000 <control-0000> , U+2400 ␀ SYMBOL FOR NULL (a single-character glyph "NUL") Null sign (∅), the empty set
[citation needed] 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.
This is done by having it call another template, of which the name is a parameter; one version of the other template contains the additional text, the other version is blank. See optional text. However when creating a new page MediaWiki will not save an empty page, or one with only whitespace. Instead you must first create a non-empty page, e.g ...
The hardware code page of the original IBM PC supplied the following box-drawing characters, in what DOS now calls code page 437. This subset of the Unicode box-drawing characters is thus included in WGL4 and is far more popular and likely to be rendered correctly:
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The languages or special content the page includes. This is the text immediately after "This page contains". Free-form, so you can specify as many as you like. Remember to link to the articles for the characters / languages. |fix= The "rendering support" link to a page with the solution (installing fonts, etc.).