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The phrase "a knot at" is correct and usable in written English.
It can be used to describe a specific location or point where a knot is tied or formed, often in a physical or metaphorical context.
Example: "There was a knot at the end of the rope that secured the boat to the dock."
Alternatives: "a tangle at" or "a twist at".
Exact(60)
This is a real contradiction, clenched like a knot at the heart of the book.
Tie a knot at both loose ends and reinsert the tube, pump up and go.
Figure 1.13 illustrates a single insertion of a knot at parameter value, resulting in a knot with multiplicity one.
She was successful on the next try, drew the thread out, and tied a knot at the bottom.
A closed sac was formed by tying a knot at the open end of the tube.
Tie a knot at one end of the string.
We apply B-spline basis functions, placing a knot at each of the J time points.
Therefore, temperature was modeled using linear splines with a knot at 11.5°C.
Linear spline regression with a knot at year 2004 was fit for each indicator.
The second operation is inserting a knot at the end of a specified time frame.
A piecewise linear spline function with a knot at 10 mg m−3-years provided the best model fit.
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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