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Similarly, a request to DELETE a certain user will have no effect if that user has already been deleted. In contrast, the methods POST, CONNECT, and PATCH are not necessarily idempotent, and therefore sending an identical POST request multiple times may further modify the state of the server or have further effects, such as sending multiple ...
A sequence of idempotent subroutines where at least one subroutine is different from the others, however, is not necessarily idempotent if a later subroutine in the sequence changes a value that an earlier subroutine depends on—idempotence is not closed under sequential composition. For example, suppose the initial value of a variable is 3 ...
Non-idempotent requests such as POST should not be pipelined. [6] Read requests like GET and HEAD can always be pipelined. A sequence of other idempotent requests like PUT and DELETE can be pipelined or not depending on whether requests in the sequence depend on the effect of others. [1] HTTP pipelining requires both the client and the server ...
The PATCH method is not idempotent. It can be made idempotent by using a conditional request. [ 1 ] When a client makes a conditional request to a resource, the request succeeds only if the resource has not been updated since the client last accessed that resource.
To introduce a disambiguation page only to differentiate the word idempotent used as an adjective and as a noun seems clunky. As a noun, it is in effect an abbreviation for idempotent element. For this, redirecting idempotent to Idempotence seems okay, as the article does deal with it and gives a link to the main article.
setx is idempotent because the second application of setx to 3 has the same effect on the system state as the first application: x was already set to 3 after the first application, and it is still set to 3 after the second application. A pure function is idempotent if it is idempotent in the mathematical sense. For instance, consider the ...
In mathematics, an idempotent binary relation is a binary relation R on a set X (a subset of Cartesian product X × X) for which the composition of relations R ∘ R is the same as R. [ 1 ] [ 2 ] This notion generalizes that of an idempotent function to relations.
By looking at the endomorphism ring of a module, one can tell whether the module is indecomposable: if and only if the endomorphism ring does not contain an idempotent element different from 0 and 1. [1] (If f is such an idempotent endomorphism of M, then M is the direct sum of ker(f) and im(f).)