# first-order theory

## first-order theory

[¦fərst ‚ȯrd·ər ′thē·ə·rē]
(mathematics)
A logical theory in which predicates are not allowed to have other functions or predicates as arguments and in which predicate quantifiers and function quantifiers are not permitted.
(optics)
(physics)
A theory which takes into account only the most important terms, such as the term proportional to the independent variable in the series expansion of a function appearing in the theory.
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References in periodicals archive ?
The collaborators constructed an algorithm to state categorically with first-order theory that certain mathematical objects held a definitive property.
Efficiently Simulating Higher-Order Arithmetic by a First-Order Theory Modulo.
Naive set theory can be formulated in various ways, for example, as a first-order theory in a language containing identity and a membership predicate [is an element of], a theory whose axioms include all instances of the (generalised) na<ve comprehension schema:
For simplicity, I will mainly consider the first form, in which we have a first-order theory with extensionality and the generalised comprehension axiom schema.
Another common response to the semantic problem for set theory is to appeal to proper class theory, conceived of either as a multi-sorted first-order theory or as second-order logic in disguise.
One version of the Lowenheim-Skolem theorem tells us that every consistent first-order theory in a countable language has a countable model whose domain is a subset of the natural numbers.
Taylor's approach is basically a first-order theory and is therefore restricted to small drop deformations.
The experimental data at high capillarity numbers, up to sample deformations of the order of 5, were found to be in good agreement with Taylor's first-order theory.
The analyst suspends the positivism (the external standing) of the first-order theory, so to speak (e.
The first-order theory of operation requires that for maximum DC-to-RF conversion efficiency the DC voltage drop across the avalanche layer must be minimized compared to the drop across the drift layer, since only in the drift layer is the AC current antiphase to the AC voltage.
This first Ku-band HJ-IMPATT diode (and to some extent the first K-band HJ-IMPATT diode profile) proved vital in the development of the first-order theory of operation.
Kharlampovich developed an algorithm to state categorically with first-order theory that certain mathematical objects (in that instance free groups) held a definitive property.

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