Difference between revisions of "Domain of individuals (in logic)"
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A term in [[Model theory|model theory]] denoting the domain of variation of individual (object) variables of a given formal language of first-order predicate calculus. Each such language is completely described by the set | A term in [[Model theory|model theory]] denoting the domain of variation of individual (object) variables of a given formal language of first-order predicate calculus. Each such language is completely described by the set | ||
| − | + | $$L=\{P_0,\ldots,P_n,\ldots,F_0,\ldots,F_m,\ldots\}$$ | |
| − | where | + | where $P_0,\ldots,P_n,\ldots,$ are predicate symbols and $F_0,\ldots,F_m,\ldots,$ are function symbols for each of which a number of argument places is given. A model $\mathfrak M$ (or an algebraic system) of $L$ is given by a non-empty set $M$ and an interpreting function $I$, defined on $L$ and assigning an $n$-place predicate to an $n$-place predicate symbol, i.e. a subset of the Cartesian power $M^n$ of $M$, and an $n$-place function $M^n\to M$ to an $n$-place function symbol. The set $M$ is called the domain of individuals (or universe) of the model $\mathfrak M$. |
====References==== | ====References==== | ||
<table><TR><TD valign="top">[1]</TD> <TD valign="top"> S.C. Kleene, "Mathematical logic" , Wiley (1967)</TD></TR><TR><TD valign="top">[2]</TD> <TD valign="top"> C.C. Chang, H.J. Keisler, "Model theory" , North-Holland (1973)</TD></TR><TR><TD valign="top">[3]</TD> <TD valign="top"> Yu.L. Ershov, E.A. Palyutin, "Mathematical logic" , Moscow (1987) (In Russian)</TD></TR></table> | <table><TR><TD valign="top">[1]</TD> <TD valign="top"> S.C. Kleene, "Mathematical logic" , Wiley (1967)</TD></TR><TR><TD valign="top">[2]</TD> <TD valign="top"> C.C. Chang, H.J. Keisler, "Model theory" , North-Holland (1973)</TD></TR><TR><TD valign="top">[3]</TD> <TD valign="top"> Yu.L. Ershov, E.A. Palyutin, "Mathematical logic" , Moscow (1987) (In Russian)</TD></TR></table> | ||
Revision as of 11:01, 7 August 2014
universe
A term in model theory denoting the domain of variation of individual (object) variables of a given formal language of first-order predicate calculus. Each such language is completely described by the set
$$L=\{P_0,\ldots,P_n,\ldots,F_0,\ldots,F_m,\ldots\}$$
where $P_0,\ldots,P_n,\ldots,$ are predicate symbols and $F_0,\ldots,F_m,\ldots,$ are function symbols for each of which a number of argument places is given. A model $\mathfrak M$ (or an algebraic system) of $L$ is given by a non-empty set $M$ and an interpreting function $I$, defined on $L$ and assigning an $n$-place predicate to an $n$-place predicate symbol, i.e. a subset of the Cartesian power $M^n$ of $M$, and an $n$-place function $M^n\to M$ to an $n$-place function symbol. The set $M$ is called the domain of individuals (or universe) of the model $\mathfrak M$.
References
| [1] | S.C. Kleene, "Mathematical logic" , Wiley (1967) |
| [2] | C.C. Chang, H.J. Keisler, "Model theory" , North-Holland (1973) |
| [3] | Yu.L. Ershov, E.A. Palyutin, "Mathematical logic" , Moscow (1987) (In Russian) |
How to Cite This Entry:
Domain of individuals (in logic). Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Domain_of_individuals_(in_logic)&oldid=32761
Domain of individuals (in logic). Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Domain_of_individuals_(in_logic)&oldid=32761
This article was adapted from an original article by V.N. Grishin (originator), which appeared in Encyclopedia of Mathematics - ISBN 1402006098. See original article