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The phrase "assumption is not valid" is grammatically correct and can be used in written English.
It can be used to express that a particular belief or assumption is not supported by evidence or is incorrect. Example: "We cannot move forward with this project until we reassess our assumptions. It is possible that our initial assumption is not valid and we need to gather more data before making any decisions."
Exact(56)
We contend that this assumption is not valid.
Subsequent research has shown that this assumption is not valid.
Under these conditions, the sharp-interface assumption is not valid.
However, this assumption is not valid in the presence of loss of communication or data.
For ratio of shear moduli less than 16, the rigid foundation assumption is not valid.
The assumption is not valid when important attenuation effects are present as a result of, for example, vegetation resistance.
This assumption is not valid anymore for very flexible blade design because such blades often experience large deflections.
Similar(4)
We found that this assumption was not valid for a minority of contrasts (Additional File 1).
However, we previously reported that the above simple assumption was not valid in colon cancer [ 30].
There was no evidence that the proportional hazards assumption was not valid in any of the models presented.
However, testing proved this assumption was not valid, thus highlighting the importance of evaluating any assumptions of similarity imposed across studies.
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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