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Python 2.7+ also supports set comprehensions and dictionary comprehensions. First-class functions. In Python, functions are first-class objects that can be created and passed around dynamically. Python's limited support for anonymous functions is the lambda construct. An example is the anonymous function which squares its input, called with the ...
Python's isoperator may be used to compare object identities (comparison by reference), and comparisons may be chained—for example, a<=b<=c. Python uses and, or, and notas Boolean operators. Python has a type of expression named a list comprehension, and a more general expression named a generatorexpression.
For a full list of editing commands, see Help:Wikitext. For including parser functions, variables and behavior switches, see Help:Magic words. For a guide to displaying mathematical equations and formulas, see Help:Displaying a formula. For a guide to editing, see Wikipedia:Contributing to Wikipedia. For an overview of commonly used style ...
Tuple. In mathematics, a tuple is a finite sequence or ordered list of numbers or, more generally, mathematical objects, which are called the elements of the tuple. An n-tuple is a tuple of n elements, where n is a non-negative integer. There is only one 0-tuple, called the empty tuple. A 1-tuple and a 2-tuple are commonly called a singleton ...
Tuple relational calculus. Tuple calculus is a calculus that was created and introduced by Edgar F. Codd as part of the relational model, in order to provide a declarative database-query language for data manipulation in this data model. It formed the inspiration for the database-query languages QUEL and SQL, of which the latter, although far ...
Relation (database) In database theory, a relation, as originally defined by E. F. Codd, [1] is a set of tuples (d 1 ,d 2 ,...,d n ), where each element d j is a member of D j, a data domain. Codd's original definition notwithstanding, and contrary to the usual definition in mathematics, there is no ordering to the elements of the tuples of a ...
v. t. e. In computer scienceand logic, a dependent typeis a type whose definition depends on a value. It is an overlapping feature of type theoryand type systems. In intuitionistic type theory, dependent types are used to encode logic's quantifierslike "for all" and "there exists". In functional programming languageslike Agda, ATS, Coq, F ...
The multi-index notation allows the extension of many formulae from elementary calculus to the corresponding multi-variable case. Below are some examples. In all the following, (or ), , and (or ). Note that, since x + y is a vector and α is a multi-index, the expression on the left is short for (x1 + y1)α1⋯ (xn + yn)αn.