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   Actor model

   In computer science, the Actor model is a mathematical model of concurrent computation that treats "actors" as the universal primitives of concurrent digital computation: in response to a message that it receives, an actor can make local decisions, create more actors, send more messages, and determine how to respond to the next message received. The Actor model originated in 1973 and the most recent overview paper is by Carl Hewitt.
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   Denotational semantics of the Actor model

   It may help to point out that the increasing sequences produced by sequential programs all have least upper bounds. ... Actor model
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   History of the Actor model

   In computer science, the Actor model, first published in 1973 (Hewitt et al. 1973), is a mathematical model of concurrent computation. ... Laws for Actors
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   Quasispecies model

   The quasispecies model is a description of the process of the Darwinian evolution of certain self-replicating entities within the framework of physical chemistry. ... This eigenvalue corresponds to the eigenvector [0,1,1,1], which represents the quasispecies consisting of sequences 2, 3, and 4, which will be present in equal numbers after a very long time.
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   Standard Model (mathematical formulation)

   (However, in some extensions of the standard model it does.) ... This fact can be simply accommodated in the Standard Model by adding a right-handed neutrino.
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   Actor model and process calculi history

   Process calculi and Actor model ... Concurrent Behaviour: Sequences, Processes and Axioms Lecture Notes in Computer Science Vol.197 1984.
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   Actor model later history

   In computer science, the Actor model, first published in 1973 (Hewitt et al. 1973), is a mathematical model of concurrent computation. ... Actor model
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   Lifson-Roig model

   In polymer science, the Lifson-Roig model is a helix-coil transition model applied to the alpha helix-random coil transition of polypeptides; it is a refinement of the Zimm-Bragg model that recognizes that a polypeptide alpha helix is only stabilized by a hydrogen bond only once three consecutive residues have adopted the helical conformation. ... Analogous extensions of the Zimm-Bragg model have been put forth but have not accommodated mixed helical conformations.
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   Lifson–Roig model

   In polymer science, the Lifson-Roig model is a helix-coil transition model applied to the alpha helix-random coil transition of polypeptides; it is a refinement of the Zimm-Bragg model that recognizes that a polypeptide alpha helix is only stabilized by a hydrogen bond only once three consecutive residues have adopted the helical conformation. ... Analogous extensions of the Zimm-Bragg model have been put forth but have not accommodated mixed helical conformations.
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    Substitution model

    In terms of substitution models, this simply means that over time, the relative frequencies of each character do not change. ... The small number of parameters to estimate makes this feasible, but also DNA is often highly optimized for specific purposes (e.g. fast expression or stability) depending on the organism and the type of gene, making it necessary to adjust the model to these circumstances.

Explore the following pages on Powerset:

• Actor model,
• Denotational semantics of the Actor model,
• History of the Actor model,
• Quasispecies model,
• Standard Model (mathematical formulation),
• Actor model and process calculi history,
• Actor model later history,
• Lifson-Roig model,
• Lifson–Roig model,
• Substitution model

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