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Value restriction information


In programming languages with Hindley-Milner type inference and imperative features, in particular the ML programming language family, the value restriction means that declarations are only polymorphically generalized if they are syntactic values (also called non-expansive). The value restriction prevents reference cells from holding values of different types and preserves type safety.

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Value restriction

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the value restriction means that declarations are only polymorphically generalized if they are syntactic values (also called non-expansive). The value restriction...

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Restriction enzyme

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A restriction enzyme, restriction endonuclease, REase, ENase or restrictase is an enzyme that cleaves DNA into fragments at or near specific recognition...

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Value of control

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for the latter. Obtaining meaningful value-of-control measurements requires an awareness of important restrictions (concerning the nature of free will...

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Bank Restriction Act 1797

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The Bank Restriction Act 1797 was an Act of the Parliament of Great Britain (37 Geo. 3. c. 45) which removed the requirement for the Bank of England to...

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Height restriction laws

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restrictions serve aesthetic values, such as blending in with other housing and not obscuring important landmarks. Other restrictions may serve a practical purpose...

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Description logic

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concepts, universal restriction and existential restriction. Other constructors have no corresponding construction in FOL including restrictions on roles for...

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New Zealand property bubble

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loan-to-value ratio measures how much a bank lends for a property, compared to the property's total value. Loan-to-value (LVR) restrictions were first...

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Digital rights management

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the number of devices on which a legal user can install content. This restriction typically support 3-5 devices. This affects users who have more devices...

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Genetic use restriction technology

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Genetic use restriction technology (GURT), also known as terminator technology or suicide seeds, is designed to restrict access to "genetic materials...

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Road space rationing

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Road space rationing, also known as alternate-day travel, driving restriction and no-drive days (Spanish: restricción vehicular; Portuguese: rodízio veicular;...

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Restriction modification system

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The restriction modification system (RM system) is found in bacteria and archaea, and provides a defense against foreign DNA, such as that borne by bacteriophages...

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Choked flow

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acting on the liquid flow through the restriction causes a decrease of the liquid pressure beyond the restriction to below that of the liquid's vapor pressure...

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Lightness

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CIE XYZ Y tristimulus value of the reference white point (the subscript n suggests "normalized") and is subject to the restriction Y/Yn > 0.01. Pauli removes...

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Freedom of speech in the United States

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freedom of speech and expression is strongly protected from government restrictions by the First Amendment to the U.S. Constitution, many state constitutions...

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Complex logarithm

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just a restriction of Log ⁡ z {\displaystyle \operatorname {Log} z} , as can be shown by differentiating the difference and comparing values at 1.) Once...

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Mortgage

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banks and mortgage brokerages in Canada face restrictions on lending more than 80% of the property value; beyond this level, mortgage insurance is generally...

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Crystallographic restriction theorem

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The crystallographic restriction theorem in its basic form was based on the observation that the rotational symmetries of a crystal are usually limited...

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Eigenvalues and eigenvectors

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{v} =\lambda \mathbf {v} } . The corresponding eigenvalue, characteristic value, or characteristic root is the multiplying factor λ {\displaystyle \lambda...

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Restriction of Hazardous Substances Directive

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The Restriction of Hazardous Substances Directive 2002/95/EC (RoHS 1), short for Directive on the restriction of the use of certain hazardous substances...

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Multivalued function

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a multiple-valued function) is a function that has two or more values in its range for at least one point in its domain. It is a set-valued function with...

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JSON

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other types within them. This restriction was dropped in RFC 7158, where a JSON text was redefined as any serialized value. Numbers in JSON are agnostic...

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Replay value

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Replay value (or, colloquially, replayability) is the potential of a video game or other media products for continued play value after its first completion...

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European Union value added tax

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The European Union value-added tax (or EU VAT) is a value added tax on goods and services within the European Union (EU). The EU's institutions do not...

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