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Typographical symbols and punctuation marks are marks and symbols used in typography with a variety of purposes such as to help with legibility and accessibility, or to identify special cases. This list gives those most commonly encountered with Latin script. For a far more comprehensive list of symbols and signs, see List of Unicode characters.
Symbol Name Symbol(s) Meaning Example of Use Dele: Delete: Pilcrow (Unicode U+00B6) ¶ Begin new paragraph: Pilcrow (Unicode U+00B6) ¶ no: Remove paragraph break: Caret [a] (Unicode U+2038, 2041, 2380) ‸ or ⁁ or ⎀ Insert # Insert space: Close up (Unicode U+2050) ⁐ Tie words together, eliminating a space: I was reading the news⁐paper ...
It is decidable whether a given grammar is a regular grammar, [f] as well as whether it is an LL grammar for a given k≥0. [26]: 233 If k is not given, the latter problem is undecidable. [26]: 252 Given a context-free grammar, it is not decidable whether its language is regular, [27] nor whether it is an LL(k) language for a given k.
where A, B, and C are nonterminal symbols, the letter a is a terminal symbol (a symbol that represents a constant value), S is the start symbol, and ε denotes the empty string. Also, neither B nor C may be the start symbol , and the third production rule can only appear if ε is in L ( G ), the language produced by the context-free grammar G .
It includes block codes, the multilevel pattern matching (MPM) algorithm, [3] variations of the incremental parsing Lempel-Ziv code, [4] and many other new universal lossless compression algorithms. Grammar-based codes are universal in the sense that they can achieve asymptotically the entropy rate of any stationary, ergodic source with a ...
To use alt key codes for keyboard shortcut symbols you’ll need to have this enabled. If you’re using a laptop, your number pad is probably integrated to save space. No problem! Just hit the Fn ...
The phrase grammar of most programming languages can be specified using a Type-2 grammar, i.e., they are context-free grammars, [8] though the overall syntax is context-sensitive (due to variable declarations and nested scopes), hence Type-1. However, there are exceptions, and for some languages the phrase grammar is Type-0 (Turing-complete).
An attribute grammar is a formal way to supplement a formal grammar with semantic information processing. Semantic information is stored in attributes associated with terminal and nonterminal symbols of the grammar. The values of attributes are the result of attribute evaluation rules associated with productions of the grammar.