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  2. Type–token distinction - Wikipedia

    en.wikipedia.org/wiki/Type–token_distinction

    The type–token distinction separates types (abstract descriptive concepts) from tokens (objects that instantiate concepts). For example, in the sentence "the bicycle is becoming more popular" the word bicycle represents the abstract concept of bicycles and this abstract concept is a type, whereas in the sentence "the bicycle is in the garage", it represents a particular object and this ...

  3. Glossary of numismatics - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_numismatics

    Also called Communion tokens. Tokens generally issued initially by Scottish parishes (die stamped one-side only to show the parish) and later in the United States and Canada. They were square or oblong, made of lead, iron or brass and measured 1/4" to 1". [4] circulated A term used to indicate a coin that has wear. clad coinage

  4. Shunting yard algorithm - Wikipedia

    en.wikipedia.org/wiki/Shunting_yard_algorithm

    */ /* This implementation does not implement composite functions, functions with a variable number of arguments, or unary operators. */ while there are tokens to be read: read a token if the token is: - a number: put it into the output queue - a function: push it onto the operator stack - an operator o 1: while ( there is an operator o 2 at the ...

  5. Class formation - Wikipedia

    en.wikipedia.org/wiki/Class_formation

    If we apply the case n=−2 of Tate's theorem to a class formation, we find that there is an isomorphism H −2 (E/F,Z) → H 0 (E/F,A F) for any normal layer E/F. The group H −2 (E/F,Z) is just the abelianization of E/F, and the group H 0 (E/F,A F) is A E modulo the group of norms of A F.

  6. Lexeme - Wikipedia

    en.wikipedia.org/wiki/Lexeme

    For example, in the English language, run, runs, ran and running are forms of the same lexeme, which can be represented as RUN. [note 1] One form, the lemma (or citation form), is chosen by convention as the canonical form of a lexeme. The lemma is the form used in dictionaries as an entry's headword. Other forms of a lexeme are often listed ...

  7. Second partial derivative test - Wikipedia

    en.wikipedia.org/wiki/Second_partial_derivative_test

    If D(a, b) < 0 then (a, b) is a saddle point of f. If D(a, b) = 0 then the point (a, b) could be any of a minimum, maximum, or saddle point (that is, the test is inconclusive). Sometimes other equivalent versions of the test are used. In cases 1 and 2, the requirement that f xx f yy − f xy 2 is positive at (x, y) implies that f xx and f yy ...

  8. History of ancient numeral systems - Wikipedia

    en.wikipedia.org/wiki/History_of_ancient_numeral...

    Different combinations of token shapes and sizes encoded the different counting systems. [18] Archaeologist Denise Schmandt-Besserat has argued that the plain geometric tokens used for numbers were accompanied by complex tokens that identified the commodities being enumerated. For ungulates like sheep, this complex token was a flat disk marked ...

  9. Token coin - Wikipedia

    en.wikipedia.org/wiki/Token_coin

    Their functions are not documented, but they appear to have been brothel tokens or possibly gaming tokens. [2] A 19th century brothel token from the Red Dog Saloon. Medieval English monasteries issued tokens to pay for services from outsiders. These tokens circulated in nearby villages, where they were called "Abbot's money".