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  2. Glossary of mathematical symbols - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_mathematical...

    For example, quotient set, quotient group, quotient category, etc. 3. In number theory and field theory, / denotes a field extension, where F is an extension field of the field E. 4. In probability theory, denotes a conditional probability. For example, (/) denotes the probability of A, given that B occurs.

  3. List of logic symbols - Wikipedia

    en.wikipedia.org/wiki/List_of_logic_symbols

    Corner quotes, also called “Quine quotes”; for quasi-quotation, i.e. quoting specific context of unspecified (“variable”) expressions; [4] also used for denoting Gödel number; [5] for example “āŒœGāŒ” denotes the Gödel number of G. (Typographical note: although the quotes appears as a “pair” in unicode (231C and 231D), they ...

  4. Exclamation mark - Wikipedia

    en.wikipedia.org/wiki/Exclamation_mark

    The exclamation mark often marks the end of a sentence, for example: "Watch out!". Similarly, a bare exclamation mark (with nothing before or after) is often used in warning signs . The exclamation mark is often used in writing to make a character seem as though they are shouting, excited, or surprised.

  5. Mathematical operators and symbols in Unicode - Wikipedia

    en.wikipedia.org/wiki/Mathematical_operators_and...

    The Mathematical Alphanumeric Symbols block (U+1D400–U+1D7FF) contains Latin and Greek letters and decimal digits that enable mathematicians to denote different notions with different letter styles. The reserved code points (the "holes") in the alphabetic ranges up to U+1D551 duplicate characters in the Letterlike Symbols block. In order ...

  6. List of Unicode characters - Wikipedia

    en.wikipedia.org/wiki/List_of_Unicode_characters

    A numeric character reference refers to a character by its Universal Character Set/Unicode code point, and a character entity reference refers to a character by a predefined name. A numeric character reference uses the format &#nnnn; or &#xhhhh; where nnnn is the code point in decimal form, and hhhh is the code point in hexadecimal form.

  7. Upside-down question and exclamation marks - Wikipedia

    en.wikipedia.org/wiki/Upside-down_question_and...

    Outside of the Spanish-speaking world, John Wilkins proposed using the upside-down exclamation mark "¡" as a symbol at the end of a sentence to denote irony in 1668. He was one of many, including Desiderius Erasmus , who felt there was a need for such a punctuation mark, but Wilkins' proposal, like the other attempts, failed to take hold.

  8. When it's OK to use exclamation points in emails - AOL

    www.aol.com/article/2016/10/14/when-its-ok-to...

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  9. Fraction - Wikipedia

    en.wikipedia.org/wiki/Fraction

    The term fraction and the notation ā  a / b ā  can also be used for mathematical expressions that do not represent a rational number (for example ), and even do not represent any number (for example the rational fraction).