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Discover LudwigThe phrase "first derivative" is correct and usable in written English
You can use it in many contexts, such as calculus and finance. For example, "We used the first derivative to determine the rate of change in the stock price."
Exact(60)
The second and first derivative synchronous fluorescence spectra were derived.
(b) Single action potential waveform aligned to its first derivative.
More precisely, that the first derivative is continuous.
First derivative spectra were computed using Savitzky Golay transformation.
Tulu and Bulu were no longer recognizably identical — but they shared the first derivative of identity.
λmax values were determined from the first derivative of the smoothed spectra.
See Janus Capital Group, Inc. v. First Derivative Traders, 131 S. Ct. 2296 (2011).
After all, the first derivative of innovation is marketing.
with representing the first derivative of.
However, their first derivative is zero.
b The corresponding first derivative spectra.
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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