The phrase "a sum of states" is correct and usable in written English.
It can be used in contexts discussing physics, mathematics, or any situation where multiple states or conditions are being combined or considered together.
Example: "In quantum mechanics, the system can exist in a superposition, represented as a sum of states."
Alternatives: "a combination of states" or "an aggregation of states."
A bit more specifically, Armstrong (2004, 74) takes a totality state of affairs to be a higher-order atomic state of affairs of the form [Tot,T,being a state of affairs], where T is a sum of states of affairs — intuitively, the state of affairs that the sum in question is a totality with regard to the property in question.
Before a system has been measured, it will be in a superposition of such states (mathematically, a sum of state vectors weighted by complex coefficients).
India's national elections are now a sum of many state elections, where pan-India leadership projections garner great media attention but little electoral gain.
Of course, the shear stresses given by Equations (42) and (43) are also presented as a sum of steady-state and transient solutions.
The starting solutions that have been obtained for velocity and shear stress are presented as a sum of steady-state and transient solutions.
New exact solutions for the same problem, but presented as a sum of steady-state and transient solutions, have also been established by Corina Fetecau et al. [6].
They are presented as a sum of steady-state and transient solutions and satisfy both the governing equations and all imposed initial and boundary conditions.
The solutions that have been obtained are presented as a sum of steady-state and transient solutions and can be easily reduced to the similar solutions corresponding to Newtonian or Maxwell fluids.
Following this, we derive semidefinite programming conditions, expressed as a Sum-of-Squares program, for state feedback synthesis of these systems using a restricted structure of the Lyapunov functional.
The Harvard team proposes an image of history that is not a record of culture – the ensemble of ways of living, transmitted across generations – but a sum of the material states of humans.
In order to write as a sum of the steady-state and transient solutions, we use the relation int_{0}^{tau}f ( xi,tau,s ), mathrm{d} s=int_{0}^{infty}f ( xi,tau,s ), mathrm{d} s-int_{tau}^{infty}f ( xi,tau,s ), mathrm{d}s.
