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idempotent    
n. 鑒一性

鑒一性

idempotent
冪等

idempotent
*冪等

idempotent
adj 1: unchanged in value following multiplication by itself;
"this matrix is idempotent"

1. A function f : D -> D is idempotent if

f (f x) = f x for all x in D.

I.e. repeated applications have the same effect as one. This
can be extended to functions of more than one argument,
e.g. Boolean & has x & x = x. Any value in the {image} of an
idempotent function is a {fixed point} of the function.

2. This term can be used to describe {C} header files, which
contain common definitions and declarations to be included by
several source files. If a header file is ever included twice
during the same compilation (perhaps due to nested #include
files), compilation errors can result unless the header file
has protected itself against multiple inclusion; a header file
so protected is said to be idempotent.

3. The term can also be used to describe an initialisation
subroutine that is arranged to perform some critical action
exactly once, even if the routine is called several times.

[{Jargon File}]

(1995-01-11)

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  • IDEMPOTENT Definition Meaning - Merriam-Webster
    The meaning of IDEMPOTENT is relating to or being a mathematical quantity which when applied to itself under a given binary operation (such as multiplication) equals itself; also : relating to or being an operation under which a mathematical quantity is idempotent
  • What is Idempotence? Explained with Real-World Examples
    A message queue can contribute to making a system idempotent by ensuring that even if a message (representing a request) is delivered multiple times, the operation it triggers is executed only once, or its effect is the same regardless of how many times it's executed
  • Idempotence - Wikipedia
    Idempotence (UK: ˌɪdɛmˈpoʊtəns , [1] US: ˈaɪdəm - ) [2] is the property of certain operations in mathematics and computer science whereby they can be applied multiple times without changing the result beyond the initial application
  • IDEMPOTENT | English meaning - Cambridge Dictionary
    An idempotent element of a set does not change in value when multiplied by itself Every restriction idempotent is restriction inverse to itself, and is therefore extensive The projection morphism is well-defined and the minimisation process is idempotent
  • What is Idempotency? Meaning, Examples, Use Cases, and How to Measure . . .
    Idempotency is the property of an operation where performing it once or performing it multiple times has the same effect as performing it exactly once Analogy: pressing the “save” button repeatedly on a document that is already saved — the content and saved state don’t change after the first successful press
  • What is an Idempotent REST API? - GeeksforGeeks
    In REST APIs, idempotence means that application of the same operation more than once changes nothing except for the first iteration That is, if a client submits the same request twice, the state of the server will be the same as if it only received that request once
  • Idempotent — Definition, Formula Examples
    Idempotent describes an element that, when applied to itself, gives back the same element For matrices, a matrix A is idempotent if multiplying it by itself yields A again: A² = A
  • What is an idempotent operation? - Stack Overflow
    Idempotent operations are often used in the design of network protocols, where a request to perform an operation is guaranteed to happen at least once, but might also happen more than once If the operation is idempotent, then there is no harm in performing the operation two or more times
  • Idempotent: What It Means, Why It Matters, and Where You’ll See It
    Idempotent operations produce the same result no matter how many times you run them This article explains what idempotency means, why it matters for reliability and scale, and how to design APIs, jobs, and pipelines to be idempotent





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