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The phrase "a class of unknown" is not correct in standard written English.
It may be intended to refer to a category or group that is not specified or identified, but it lacks clarity and proper context.
Example: "In the study, we encountered a class of unknown variables that affected the results."
Alternatives: "a category of unknowns" or "a group of unidentified".
Exact(23)
A class of unknown fractional-order systems is introduced.
This paper proposes a robust intelligent tracking controller (RITC) for a class of unknown nonlinear systems.
An industrial gripping application with unknown contact mechanism is considered as a class of unknown nonlinear discrete-time systems.
For a class of unknown nonlinear time-delay systems, an adaptive neural network (NN) control design approach is proposed.
This paper considers the solution of a minmax optimization problem for a class of unknown nonlinear systems using a perturbation-based proportional-integral extremum seeking control design technique.
We introduce a control law for a class of unknown nonlinear continuous-time systems in which full state measurements are available.
Similar(37)
In this paper, a novel adaptive fault tolerant controller design is proposed for a class of nonlinear unknown systems with multiple actuators.
The arrival of Plan B may herald the emergence of a class of pharmaceuticals unknown in America: behind-the-counter (BTC) drugs.In this section Would you fly in chattering class?
Mundy et al. [ 6] considered statins a class of previously unknown bone anabolic agents.
The core idea relies on the introduction of a new class of Unknown Input Interval Observers (UIIOs).
An observer based adaptive fuzzy controller for a certain class of unknown nonlinear systems is proposed in this paper.
More suggestions(2)
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com