The phrase "are defined either in" is correct and usable in written English.
It can be used when specifying the sources or contexts in which certain terms, concepts, or parameters are established or explained.
Example: "The parameters for the experiment are defined either in the methodology section or in the appendix of the report."
Alternatives: "are specified either in" or "are outlined either in".
The vorticity fields considered have a free-boundary and may be defined either in a domain with boundary or in free space; moreover, the common restriction to the case of constant vorticity regions is not imposed.
This expanded range could be defined either in terms of access by the types of firms that are systemically important in market-based finance, or by types of activity or assets".
This parity may be defined either in terms of gold or in relation to a key currency such as the British pound sterling or the United States dollar, which in turn has a fixed parity with gold.
The algorithm is defined either in the perceivability-based or the existence-based form, representing distributed consensus-based versions of the classical PDA tracker from [10,11] and the existence-based tracker from [15], respectively.
The choice of the best option can be defined either in proximate terms (satisfaction, welfare, reinforcement) or in ultimate functions (fitness); however, proximate decision cues are supposed to have a predictive value for fitness.
This cost can be defined either in terms of loss of biological value or in terms of extra economic cost'.
According to the principle of electrical neutrality, this difference is balanced by the weak acids and CO2 such that SID can be defined either in terms of strong ions or in terms of the weak acids and CO2 offsetting it.
In the future, biomarkers that could be defined either in the serum or by bronchoalveolar lavage would be preferable to OLBx to stratify the likelihood of benefit from steroid therapy.
Serving size was defined either in 'natural' units (e.g., one teaspoon of sugar, one egg, one medium apple) or as an average serving in the Italian diet (e.g., 80 g serving of pasta, 150 g of red meat, 100 g of salad).
The topic of this article is geostatistics, the science of continuous stochastic processes that are defined either over some region in 2- or 3-dimensional geographic space or in space-time.
