The phrase "a single relation" is correct and usable in written English.
It can be used when referring to one specific connection or association between two or more entities.
Example: "In this study, we will focus on a single relation between diet and health outcomes."
Alternatives: "one relationship" or "a solitary connection".
Schlimm provides an example of an analogical reasoning problem in group theory that involves a single relation in each domain.
They each have efficient connections, meaning they established a single relation with each of three different clusters of people.
For this contribution, we defined the mapping such that each non-abstract IFC class is represented in a single relation that combines all attributes from all super-classes.
We then focus on aggregate views and queries over a single relation, which are fundamental in many applications such as data warehousing.
Tentatively, we conclude that the decay of coherency with separation at each site follows a single relation for all frequencies if the separation is scaled by the wavelength.
It follows by transitivity from Replacement being identical with Original, and Original being identical with Reassembly, that Replacement is identical with Reassembly only if a single relation of identity is involved.
Geach, among others, has addressed puzzles about both synchronic and diachronic identity by denying that there is a single absolute relation of identity rather than a host of relative identity relations.
Advocates of relative identity deny that there is a single identity relation (see Geach 1967, Griffin 1977).
In a left-deep query plan, a join takes two inputs: one from a single base relation (i.e. table) providing immediate input (referred to as the "inner relation"); and another one potentially derived as an intermediate result from a different set of relations (the "outer relation").
An empirical relation is fitted to the data over the whole range of temperatures to provide a single smooth relation for engineering applications.
Furthermore, turbulence-driven ventilation is observed to be related to the square root of the friction coefficient by a single linear relation, despite of the roof pitch.
