Idempotent

  • (adj): Unchanged in value following multiplication by itself.
    Example: "This matrix is idempotent"

Some articles on idempotent:

Pseudo-abelian Category
... category is a category that is preadditive and is such that every idempotent has a kernel ... Recall that an idempotent morphism is an endomorphism of an object with the property that ... Elementary considerations show that every idempotent then has a cokernel ...
HTTP - Request Methods - Idempotent Methods and Web Applications
... Methods PUT and DELETE are defined to be idempotent, meaning that multiple identical requests should have the same effect as a single request (Note that idempotence ... Methods GET, HEAD, OPTIONS and TRACE, being prescribed as safe, should also be idempotent, as HTTP is a stateless protocol ... In contrast, the POST method is not necessarily idempotent, and therefore sending an identical POST request multiple times may further affect state or cause further side effects (such as ...
POST (HTTP) - Affecting Server State
... RFC 2616, the POST method should be used for any context in which a request is non-idempotent that is, it causes a change in server state each time it is performed ... In practice, GET is often reserved, not simply for idempotent actions, but for nullipotent ones, ones with no side-effects (in contrast to "no side effects on second or future requests ... However, there are reasons why POST is used even for idempotent requests, notably if the request uses non-ASCII characters or is very long, due to restrictions on URLs – the ...
Brown–Peterson Cohomology - Complex Cobordism and Quillen's Idempotent
... For each prime p, Quillen showed there is a unique idempotent map of ring spectra ε from MUQ(p) to itself, with the property that ε is if n+1 is a power of p, and 0 ... The spectrum BP is the image of this idempotent ε ...
Semiring Theory
... Idempotent semirings are special to semiring theory as any ring which is idempotent under addition is trivial ... One can define a partial order ≤ on an idempotent semiring by setting a ≤ b whenever a + b = b (or, equivalently, if there exists an x such that a + x = b) ...