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Discover LudwigThe phrase "are of the fourth" is grammatically correct and can be used in written English.
It can be used in contexts where you are referring to a specific group or category that is identified as "the fourth" in a sequence or classification.
Example: "The results of the experiment indicate that the subjects are of the fourth category, which shows distinct behavioral patterns."
Alternatives: "belong to the fourth" or "are part of the fourth".
Exact(4)
As a model problem we use that of the optimal design of thin (Kirchhoff) plates, where the governing equations are of the fourth order.
Such burns are of the fourth degree, also called black (because of the typical colour of the burn), or char, burns.
As shown in Appendix B, it turns out that the leading corrections are of the fourth order for both the period T and the membrane potential.
The "hypothetical proteins" discussed here are of the fourth category.
Similar(56)
Franz Boas was of the second persuasion.
Sixte Aspair was of the fifth generation.
Each record was of the ninth inning.
I am of the second opinion.
Lina is of the second type.
This shaping is of the first importance.
Accuracy, however, is of the second concern.
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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