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  2. Line Printer Daemon protocol - Wikipedia

    en.wikipedia.org/wiki/Line_Printer_Daemon_protocol

    A server for the LPD protocol listens for requests on TCP port 515. [1] A request begins with a byte containing the request code, followed by the arguments to the request, and is terminated by an ASCII LF character. An LPD printer is identified by the IP address of the server machine and the queue name on that machine. Many different queue ...

  3. Lagrange multiplier - Wikipedia

    en.wikipedia.org/wiki/Lagrange_multiplier

    The Lagrange multiplier theorem states that at any local maximum (or minimum) of the function evaluated under the equality constraints, if constraint qualification applies (explained below), then the gradient of the function (at that point) can be expressed as a linear combination of the gradients of the constraints (at that point), with the ...

  4. Check constraint - Wikipedia

    en.wikipedia.org/wiki/Check_constraint

    Check constraints are used to ensure the validity of data in a database and to provide data integrity. If they are used at the database level, applications that use the database will not be able to add invalid data or modify valid data so the data becomes invalid, even if the application itself accepts invalid data.

  5. CUPS - Wikipedia

    en.wikipedia.org/wiki/CUPS

    CUPS allows users to send different data to the CUPS server and have that data converted into a format the printer will understand and be able to print. CUPS can process a variety of data formats on the print server. It converts the print-job data into the final language/format of the printer via a series of filters.

  6. Karush–Kuhn–Tucker conditions - Wikipedia

    en.wikipedia.org/wiki/Karush–Kuhn–Tucker...

    Consider the following nonlinear optimization problem in standard form: . minimize () subject to (),() =where is the optimization variable chosen from a convex subset of , is the objective or utility function, (=, …,) are the inequality constraint functions and (=, …,) are the equality constraint functions.

  7. Lambda architecture - Wikipedia

    en.wikipedia.org/wiki/Lambda_architecture

    Lambda architecture depends on a data model with an append-only, immutable data source that serves as a system of record. [2]: 32 It is intended for ingesting and processing timestamped events that are appended to existing events rather than overwriting them. State is determined from the natural time-based ordering of the data.

  8. Lambda calculus - Wikipedia

    en.wikipedia.org/wiki/Lambda_calculus

    In typed lambda calculus, functions can be applied only if they are capable of accepting the given input's "type" of data. Typed lambda calculi are strictly weaker than the untyped lambda calculus, which is the primary subject of this article, in the sense that typed lambda calculi can express less than the untyped calculus can. On the other ...

  9. Hindley–Milner type system - Wikipedia

    en.wikipedia.org/wiki/Hindley–Milner_type_system

    The counter-example fails because the replacement is not consistent. The consistent replacement can be made formal by applying a substitution = { , … } to the term of a type , written . As the example suggests, substitution is not only strongly related to an order, that expresses that a type is more or less special, but also with the all ...